Chatterless Countersinks

	Dia.		Black Oxide	Titanium Nitride (TiN) Coated
6 Flutes





82° Countersink Angle
1/8"	1/8"	1 1/4"	Round	Keo	3098A191	000000	Keo	3210A612	000000
3/16"	3/16"	1 3/8"	Round	Keo	3098A21	00000	Keo	3210A622	00000
1/4"	1/4"	1 1/2"	Round	Keo	3098A22	00000	Keo	3210A632	00000
5/16"	1/4"	1 3/4"	Round	Keo	3098A23	00000	Keo	3210A642	00000
3/8"	1/4"	1 3/4"	Round	Keo	3098A24	00000	Keo	3210A652	00000
1/2"	3/8"	2"	Round	Keo	3098A25	00000	Keo	3210A662	00000
5/8"	3/8"	2 1/4"	Round	Keo	3098A26	00000	Keo	3210A672	00000
3/4"	1/2"	2 5/8"	Round	Keo	3098A27	00000	Keo	3210A682	00000
7/8"	1/2"	2 3/4"	Round	Keo	3098A28	00000	Keo	3210A692	00000
1"	1/2"	2 3/4"	Round	Keo	3098A29	00000	Keo	3210A712	00000
1 1/4"	1/2"	2 3/4"	Round	Keo	3098A71	00000	Keo	3210A722	000000
1 1/2"	3/4"	2 7/8"	Round	Keo	3098A81	000000	Keo	3210A732	000000
2"	3/4"	3 1/4"	Round	Keo	3098A87	000000	Keo	3210A742	000000
2 1/2"	1"	5"	Round	Keo	3098A93	000000	—	———	0
3"	1"	5 1/4"	Round	Keo	3098A96	000000	—	———	0



90° Countersink Angle
1/8"	1/8"	1 1/4"	Round	Keo	3098A291	00000	Keo	3210A613	00000
3/16"	3/16"	1 3/8"	Round	Keo	3098A31	00000	Keo	3210A623	00000
1/4"	1/4"	1 1/2"	Round	Keo	3098A32	00000	Keo	3210A633	00000
5/16"	1/4"	1 3/4"	Round	Keo	3098A33	00000	Keo	3210A643	00000
3/8"	1/4"	1 3/4"	Round	Keo	3098A34	00000	Keo	3210A653	00000
1/2"	3/8"	2"	Round	Keo	3098A35	00000	Keo	3210A663	00000
5/8"	3/8"	2 1/4"	Round	Keo	3098A36	00000	Keo	3210A673	00000
3/4"	1/2"	2 5/8"	Round	Keo	3098A37	00000	Keo	3210A683	00000
7/8"	1/2"	2 3/4"	Round	Keo	3098A38	00000	Keo	3210A693	00000
1"	1/2"	2 3/4"	Round	Keo	3098A39	00000	Keo	3210A713	00000
1 1/4"	1/2"	2 3/4"	Round	Keo	3098A73	00000	Keo	3210A723	000000
1 1/2"	3/4"	2 7/8"	Round	Keo	3098A83	000000	Keo	3210A733	000000
2"	3/4"	3 1/4"	Round	Keo	3098A88	000000	Keo	3210A743	000000

	Dia.		Black Oxide	Titanium Nitride (TiN) Coated
6 Flutes





82° Countersink Angle
1/8"	1/8"	1 1/4"	Round	Keo	3285A612	000000	—	———	0
1/8"	1/8"	1 1/2"	Round	—	———	0	Melin Tool	3213A112	000000
3/16"	3/16"	1 3/8"	Round	Keo	3285A622	00000	—	———	0
3/16"	3/16"	1 1/2"	Round	—	———	0	Melin Tool	3213A122	00000
1/4"	1/4"	1 1/2"	Round	Keo	3285A632	00000	—	———	0
1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A132	00000
5/16"	1/4"	1 1/2"	Round	Keo	3285A642	00000	—	———	0
5/16"	1/4"	2"	Round	—	———	0	Melin Tool	3213A142	00000
3/8"	1/4"	1 3/4"	Round	Keo	3285A652	00000	—	———	0
3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A152	00000
1/2"	3/8"	2"	Round	Keo	3285A662	00000	Melin Tool	3213A162	00000
5/8"	3/8"	2 1/4"	Round	Keo	3285A672	00000	Melin Tool	3213A172	00000
3/4"	1/2"	2 5/8"	Round	Keo	3285A682	00000	—	———	0
3/4"	1/2"	2 3/4"	Round	—	———	0	Melin Tool	3213A182	00000
7/8"	1/2"	2 3/4"	Round	Keo	3285A692	00000	Melin Tool	3213A192	00000
1"	1/2"	2 3/4"	Round	Keo	3285A712	00000	Melin Tool	3213A212	00000
1 1/4"	1/2"	2 3/4"	Round	Keo	3285A722	00000	—	———	0
1 1/4"	1/2"	3"	Round	—	———	0	Melin Tool	3213A222	000000
1 1/2"	3/4"	2 7/8"	Round	Keo	3285A732	000000	Keo	3213A232	000000
2"	3/4"	3 1/4"	Round	Keo	3285A742	000000	Keo	3213A251	000000



90° Countersink Angle
1/8"	1/8"	1 1/4"	Round	Keo	3285A613	00000	—	———	0
1/8"	1/8"	1 1/2"	Round	—	———	0	Melin Tool	3213A113	00000
3/16"	3/16"	1 3/8"	Round	Keo	3285A623	00000	—	———	0
3/16"	3/16"	1 1/2"	Round	—	———	0	Melin Tool	3213A123	00000
1/4"	1/4"	1 1/2"	Round	Keo	3285A633	00000	—	———	0
1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A133	00000
5/16"	1/4"	1 1/2"	Round	Keo	3285A643	00000	—	———	0
5/16"	1/4"	2"	Round	—	———	0	Melin Tool	3213A143	00000
3/8"	1/4"	1 3/4"	Round	Keo	3285A653	00000	—	———	0
3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A153	00000
1/2"	3/8"	2"	Round	Keo	3285A663	00000	Melin Tool	3213A163	00000
5/8"	3/8"	2 1/4"	Round	Keo	3285A673	00000	Melin Tool	3213A173	00000
3/4"	1/2"	2 5/8"	Round	Keo	3285A683	00000	—	———	0
3/4"	1/2"	2 3/4"	Round	—	———	0	Melin Tool	3213A183	00000
7/8"	1/2"	2 3/4"	Round	Keo	3285A693	00000	Melin Tool	3213A193	00000
1"	1/2"	2 3/4"	Round	Keo	3285A713	00000	Melin Tool	3213A213	00000
1 1/4"	1/2"	2 3/4"	Round	Keo	3285A723	00000	—	———	0
1 1/4"	1/2"	3"	Round	—	———	0	Melin Tool	3213A223	000000
1 1/2"	3/4"	2 7/8"	Round	Keo	3285A733	000000	Keo	3213A233	000000
2"	3/4"	3 1/4"	Round	Keo	3285A743	000000	Keo	3213A243	000000

	Dia.		Uncoated	Titanium Carbon Nitride (TiCN) Coated	Titanium Aluminum Nitride (TiAlN) Coated	Aluminum Titanium Nitride (AlTiN) Coated
6 Flutes





82° Countersink Angle
1/8"	1/8"	1 1/2"	Round	Ultra Tool	2923A41	000000	2944A512	000000	2944A515	000000	2944A622	000000
3/16"	3/16"	2"	Round	Ultra Tool	2923A21	00000	2944A522	00000	2944A525	00000	2944A626	00000
1/4"	1/4"	2"	Round	Ultra Tool	2923A22	00000	2944A532	00000	2944A535	00000	2944A631	00000
5/16"	1/4"	2 5/8"	Round	Ultra Tool	2923A452	00000	2944A812	00000	2944A816	00000	2944A821	00000
3/8"	1/4"	2 5/8"	Round	Ultra Tool	2923A23	00000	2944A542	00000	2944A545	00000	2944A635	00000
1/2"	1/4"	2 5/8"	Round	Ultra Tool	2923A24	00000	2944A552	00000	2944A555	00000	2944A639	00000
5/8"	3/8"	2 3/4"	Round	Ultra Tool	2923A25	00000	2944A562	00000	2944A565	00000	2944A644	00000
3/4"	3/8"	2 3/4"	Round	Ultra Tool	2923A26	00000	2944A572	000000	2944A575	000000	2944A648	000000
1"	1/2"	3"	Round	Ultra Tool	2923A28	000000	2944A582	000000	2944A585	000000	2944A653	000000
1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	2923A44	000000	2944A592	000000	2944A595	000000	2944A657	000000
1 1/2"	3/4"	3 1/4"	Round	Ultra Tool	2923A45	000000	2944A612	000000	2944A615	000000	2944A662	000000



90° Countersink Angle
1/8"	1/8"	1 1/2"	Round	Ultra Tool	2923A43	00000	2944A513	00000	2944A516	00000	2944A623	00000
3/16"	3/16"	2"	Round	Ultra Tool	2923A29	00000	2944A523	00000	2944A526	00000	2944A627	00000
1/4"	1/4"	2"	Round	Ultra Tool	2923A31	00000	2944A533	00000	2944A536	00000	2944A632	00000
5/16"	1/4"	2 5/8"	Round	Ultra Tool	2923A453	00000	2944A813	00000	2944A817	00000	2944A822	00000
3/8"	1/4"	2 5/8"	Round	Ultra Tool	2923A32	00000	2944A543	00000	2944A546	00000	2944A636	00000
1/2"	1/4"	2 5/8"	Round	Ultra Tool	2923A33	00000	2944A553	00000	2944A556	00000	2944A641	00000
5/8"	3/8"	2 3/4"	Round	Ultra Tool	2923A34	00000	2944A563	00000	2944A566	00000	2944A645	00000
3/4"	3/8"	2 3/4"	Round	Ultra Tool	2923A35	00000	2944A573	000000	2944A576	000000	2944A649	000000
1"	1/2"	3"	Round	Ultra Tool	2923A36	000000	2944A583	000000	2944A586	000000	2944A654	000000
1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	2923A48	000000	2944A593	000000	2944A596	000000	2944A658	000000
1 1/2"	3/4"	3 1/4"	Round	Ultra Tool	2923A49	000000	2944A613	000000	2944A616	000000	2944A663	000000

Precise-Cutting Countersinks for Screws

The go-to countersinks for CNC machining and other high-volume, high-precision jobs. Ground in the U.S. to a tight tolerance of 0" to 0.001", they cut dozens or even hundreds of countersunk holes with the same depth, diameter, and clean finish every time.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				82° Countersink Angle

				1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3214A121	000000


				3/8"	1/4"	0.078"	2"	Round	0" to 0.001"	Melin Tool	3214A141	00000
				1/2"	3/8"	0.109"	2"	Round	0" to 0.001"	Melin Tool	3214A161	00000
				5/8"	3/8"	0.125"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A181	00000
				3/4"	1/2"	0.156"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A211	00000
				1"	1/2"	0.203"	2 3/4"	Round	0" to 0.001"	Melin Tool	3214A251	00000




						90° Countersink Angle

						1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3214A122	00000


						3/8"	1/4"	0.078"	2"	Round	0" to 0.001"	Melin Tool	3214A142	00000
						1/2"	3/8"	0.109"	2"	Round	0" to 0.001"	Melin Tool	3214A162	00000
						5/8"	3/8"	0.125"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A182	00000
						3/4"	1/2"	0.156"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A212	00000
						1"	1/2"	0.203"	2 3/4"	Round	0" to 0.001"	Melin Tool	3214A252	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				82° Countersink Angle

				1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3308A321	000000


				3/8"	1/4"	0.078"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A341	00000
				1/2"	3/8"	0.109"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A361	00000
				5/8"	3/8"	0.125"	2 5/8"	Round	0" to 0.001"	Melin Tool	3308A381	000000
				3/4"	1/2"	0.156"	2 3/4"	Round	0" to 0.001"	Melin Tool	3308A411	000000
				1"	1/2"	0.203"	3"	Round	0" to 0.001"	Melin Tool	3308A451	000000




						90° Countersink Angle

						1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3308A322	00000


						3/8"	1/4"	0.078"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A342	00000
						1/2"	3/8"	0.109"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A362	00000
						5/8"	3/8"	0.125"	2 5/8"	Round	0" to 0.001"	Melin Tool	3308A382	000000
						3/4"	1/2"	0.156"	2 3/4"	Round	0" to 0.001"	Melin Tool	3308A412	000000
						1"	1/2"	0.203"	3"	Round	0" to 0.001"	Melin Tool	3308A452	000000

Countersinks for Rivets

Cut a cone-shaped opening in a hole to install your rivet flush with the surface. The 100°, 110°, and 120° countersink angles are compatible with standard rivet heads.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these can last 50% longer than uncoated countersinks.

Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.					Black Oxide		Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each		Each
6 Flutes







				100° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	3098A391	000000	3210A614	000000


				3/16"	3/16"	1 3/8"	Round	Keo	3098A41	00000	3210A624	00000
				1/4"	1/4"	1 1/2"	Round	Keo	3098A42	00000	3210A634	00000
				5/16"	1/4"	1 3/4"	Round	Keo	3098A43	00000	3210A644	00000
				3/8"	1/4"	1 3/4"	Round	Keo	3098A44	00000	3210A654	00000
				1/2"	3/8"	2"	Round	Keo	3098A45	00000	3210A664	00000
				5/8"	3/8"	2 1/4"	Round	Keo	3098A46	00000	3210A674	00000
				3/4"	1/2"	2 5/8"	Round	Keo	3098A47	00000	3210A684	00000
				7/8"	1/2"	2 3/4"	Round	Keo	3098A48	00000	3210A694	00000
				1"	1/2"	2 3/4"	Round	Keo	3098A49	00000	3210A714	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	3098A74	00000	3210A724	000000


				1 1/2"	3/4"	2 7/8"	Round	Keo	3098A84	000000	3210A734	000000
				2"	3/4"	3 1/4"	Round	Keo	3098A89	000000	3210A744	000000




						120° Countersink Angle

						1/8"	1/8"	1 1/4"	Round	Keo	3098A641	00000	3210A616	00000


						3/16"	3/16"	1 3/8"	Round	Keo	3098A642	00000	3210A626	00000
						1/4"	1/4"	1 1/2"	Round	Keo	3098A643	00000	3210A636	00000
						5/16"	1/4"	1 3/4"	Round	Keo	3098A644	00000	3210A646	00000
						3/8"	1/4"	1 3/4"	Round	Keo	3098A645	00000	3210A656	00000
						1/2"	3/8"	2"	Round	Keo	3098A646	00000	3210A666	00000
						5/8"	3/8"	2 1/4"	Round	Keo	3098A647	00000	3210A676	00000
						3/4"	1/2"	2 5/8"	Round	Keo	3098A648	00000	3210A68	00000
						7/8"	1/2"	2 3/4"	Round	Keo	3098A649	00000	3210A696	00000
						1"	1/2"	2 3/4"	Round	Keo	3098A651	00000	3210A716	00000
						1 1/4"	1/2"	2 3/4"	Round	Keo	3098A652	00000	3210A726	000000


						1 1/2"	3/4"	2 7/8"	Round	Keo	3098A653	000000	3210A736	000000
						2"	3/4"	3 1/4"	Round	Keo	3098A654	000000	3210A746	000000

Cobalt Steel

6 Flutes

Tough and wear resistant, these countersinks last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without chipping on hard materials, such as nickel.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these can last 50% longer than uncoated countersinks.

Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Black Oxide			Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each	Mfr.		Each
6 Flutes







				100° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	3285A614	000000	—	———	0


				3/16"	3/16"	1 3/8"	Round	Keo	3285A624	00000	—	———	0
				1/4"	1/4"	1 1/2"	Round	Keo	3285A634	00000	—	———	0
				1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A134	000000
				5/16"	1/4"	1 1/2"	Round	Keo	3285A644	00000	—	———	0
				5/16"	1/4"	2"	Round	—	———	0	Melin Tool	3213A144	00000
				3/8"	1/4"	1 3/4"	Round	Keo	3285A654	00000	—	———	0
				3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A154	00000
				1/2"	3/8"	2"	Round	Keo	3285A664	00000	Melin Tool	3213A164	00000
				5/8"	3/8"	2 1/4"	Round	Keo	3285A674	00000	Melin Tool	3213A174	00000
				3/4"	1/2"	2 5/8"	Round	Keo	3285A684	00000	—	———	0


				3/4"	1/2"	2 3/4"	Round	—	———	0	Melin Tool	3213A184	00000
				7/8"	1/2"	2 3/4"	Round	Keo	3285A694	00000	Melin Tool	3213A194	00000
				1"	1/2"	2 3/4"	Round	Keo	3285A714	00000	Melin Tool	3213A214	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	3285A724	00000	—	———	0
				1 1/2"	3/4"	2 7/8"	Round	Keo	3285A734	000000	Keo	3213A234	000000
				2"	3/4"	3 1/4"	Round	Keo	3285A744	000000	Keo	3213A244	000000




						110° Countersink Angle

						1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A135	00000


						5/16"	1/4"	2"	Round	—	———	0	Melin Tool	3213A145	00000
						3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A155	00000
						1/2"	3/8"	2"	Round	—	———	0	Melin Tool	3213A165	00000
						5/8"	3/8"	2 1/4"	Round	—	———	0	Melin Tool	3213A175	00000
						1"	1/2"	2 3/4"	Round	—	———	0	Melin Tool	3213A215	00000




								120° Countersink Angle

								1/8"	1/8"	1 1/4"	Round	Keo	3285A616	00000	—	———	0


								1/8"	1/8"	1 1/2"	Round	—	———	0	Melin Tool	3213A116	00000
								3/16"	3/16"	1 3/8"	Round	Keo	3285A626	00000	—	———	0
								3/16"	3/16"	1 1/2"	Round	—	———	0	Melin Tool	3213A126	00000
								1/4"	1/4"	1 1/2"	Round	Keo	3285A636	00000	—	———	0
								1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A136	00000
								5/16"	1/4"	1 1/2"	Round	Keo	3285A646	00000	—	———	0
								5/16"	1/4"	2"	Round	—	———	0	Melin Tool	3213A146	00000
								3/8"	1/4"	1 3/4"	Round	Keo	3285A656	00000	—	———	0
								3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A156	00000
								1/2"	3/8"	2"	Round	Keo	3285A666	00000	Melin Tool	3213A166	00000


5/8"	3/8"							2 1/4"	Round	Keo	3285A676	00000	Melin Tool	3213A176	00000
3/4"	1/2"							2 5/8"	Round	Keo	3285A686	00000	—	———	0
3/4"	1/2"							2 3/4"	Round	—	———	0	Melin Tool	3213A186	00000
7/8"	1/2"							2 3/4"	Round	Keo	3285A696	00000	—	———	0
1"	1/2"	2 3/4"						Round	Keo	3285A716	00000	Melin Tool	3213A216	00000
1 1/4"	1/2"	2 3/4"	Round					Keo	3285A726	00000	—	———	0
1 1/2"	3/4"	2 7/8"	Round					Keo	3285A736	000000	Keo	3213A236	000000
2"	3/4"	3 1/4"	Round					Keo	3285A746	000000	Keo	3213A246	000000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Titanium Carbon Nitride (TiCN) Coated—The hard, smooth finish prevents chipping and wear and reduces friction to keep material from building up.

Titanium Aluminum Nitride (TiAlN) Coated—Harder than TiCN, these countersinks cut without chipping in iron, titanium, and other metals as hard as Rockwell C50.

Aluminum Titanium Nitride (AlTiN) Coated—Our hardest and most wear-resistant countersinks, these cut through metals as hard as Rockwell C70 without losing their sharp cutting edges.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.					Uncoated		Titanium Carbon Nitride (TiCN) Coated		Titanium Aluminum Nitride (TiAlN) Coated		Aluminum Titanium Nitride (AlTiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each		Each		Each		Each
6 Flutes







				100° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Ultra Tool	2923A431	000000	2944A517	000000	2944A518	000000	2944A624	000000


				3/16"	3/16"	2"	Round	Ultra Tool	2923A291	00000	2944A527	00000	2944A528	00000	2944A628	00000
				1/4"	1/4"	2"	Round	Ultra Tool	2923A311	00000	2944A537	00000	2944A538	00000	2944A633	00000
				5/16"	1/4"	2 5/8"	Round	Ultra Tool	2923A454	00000	2944A814	00000	2944A818	00000	2944A823	00000
				3/8"	1/4"	2 5/8"	Round	Ultra Tool	2923A321	00000	2944A547	00000	2944A548	00000	2944A637	00000
				1/2"	1/4"	2 5/8"	Round	Ultra Tool	2923A331	00000	2944A557	00000	2944A558	00000	2944A642	00000
				5/8"	3/8"	2 3/4"	Round	Ultra Tool	2923A341	00000	2944A567	00000	2944A568	00000	2944A646	00000
				3/4"	3/8"	2 3/4"	Round	Ultra Tool	2923A351	00000	2944A577	000000	2944A578	000000	2944A651	000000
				1"	1/2"	3"	Round	Ultra Tool	2923A361	000000	2944A587	000000	2944A588	000000	2944A655	000000
				1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	2923A481	000000	2944A597	000000	2944A598	000000	2944A659	000000
				1 1/2"	3/4"	3 1/4"	Round	Ultra Tool	2923A491	000000	2944A617	000000	2944A618	000000	2944A664	000000

Countersinks with Two Countersinking Ends for Screws

When one end starts to wear, flip the tool around for a fresh cutting edge.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				82° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A31	000000


				3/16"	3/16"	2"	Round	Melin Tool	27885A32	00000
				1/4"	1/4"	2"	Round	Melin Tool	27885A33	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27885A34	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27885A35	00000
				1/2"	1/2"	3"	Round	Melin Tool	27885A36	00000
				5/8"	5/8"	3 1/2"	Round	Melin Tool	27885A37	00000
				3/4"	3/4"	4"	Round	Melin Tool	27885A38	00000




						90° Countersink Angle

						1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A41	00000


						3/16"	3/16"	2"	Round	Melin Tool	27885A42	00000
						1/4"	1/4"	2"	Round	Melin Tool	27885A43	00000
						5/16"	5/16"	2 1/2"	Round	Melin Tool	27885A44	00000
						3/8"	3/8"	2 1/2"	Round	Melin Tool	27885A45	00000
						1/2"	1/2"	3"	Round	Melin Tool	27885A46	00000
						5/8"	5/8"	3 1/2"	Round	Melin Tool	27885A47	00000
						3/4"	3/4"	4"	Round	Melin Tool	27885A48	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				82° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A31	000000


				3/16"	3/16"	2"	Round	Melin Tool	27655A32	00000
				1/4"	1/4"	2"	Round	Melin Tool	27655A33	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27655A34	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27655A35	00000
				1/2"	1/2"	3"	Round	Melin Tool	27655A36	000000
				5/8"	5/8"	3 1/2"	Round	Melin Tool	27655A37	000000
				3/4"	3/4"	4"	Round	Melin Tool	27655A38	000000




						90° Countersink Angle

						1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A41	00000


						3/16"	3/16"	2"	Round	Melin Tool	27655A42	00000
						1/4"	1/4"	2"	Round	Melin Tool	27655A43	00000
						5/16"	5/16"	2 1/2"	Round	Melin Tool	27655A44	00000
						3/8"	3/8"	2 1/2"	Round	Melin Tool	27655A45	00000
						1/2"	1/2"	3"	Round	Melin Tool	27655A46	000000
						5/8"	5/8"	3 1/2"	Round	Melin Tool	27655A47	000000
						3/4"	3/4"	4"	Round	Melin Tool	27655A48	000000

Countersinks for Lathe Centers

Keep your workpiece aligned as it spins between lathe centers. These countersinks match the 60° angle on both rotating and stationary centers.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these can last 50% longer than uncoated countersinks.

Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Black Oxide			Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	3098A129	000000	Keo	3210A611	000000


				3/16"	3/16"	1 3/8"	Round	Keo	3098A11	00000	Keo	3210A621	00000
				1/4"	1/4"	1 1/2"	Round	Keo	3098A12	00000	Keo	3210A631	00000
				5/16"	1/4"	1 3/4"	Round	Keo	3098A13	00000	Keo	3210A641	00000
				3/8"	1/4"	1 3/4"	Round	Keo	3098A14	00000	Keo	3210A651	00000
				1/2"	3/8"	2"	Round	Keo	3098A15	00000	Keo	3210A661	00000
				5/8"	3/8"	2 1/4"	Round	Keo	3098A16	00000	Keo	3210A671	00000
				3/4"	1/2"	2 5/8"	Round	Keo	3098A17	00000	Keo	3210A681	00000
				7/8"	1/2"	2 3/4"	Round	Keo	3098A18	00000	Keo	3210A691	00000
				1"	1/2"	2 3/4"	Round	Keo	3098A19	00000	Keo	3210A711	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	3098A72	00000	Keo	3210A721	000000


				1 1/2"	3/4"	2 7/8"	Round	Keo	3098A82	000000	Keo	3210A731	000000
				2"	3/4"	3 1/4"	Round	Keo	3098A86	000000	Keo	3210A741	000000
				2 1/2"	1"	5"	Round	Keo	3098A92	000000	—	———	0

Cobalt Steel

6 Flutes

Tough and wear resistant, these countersinks last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without chipping on hard materials, such as nickel.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these can last 50% longer than uncoated countersinks.

Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Black Oxide			Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	3285A611	000000	—	———	0


				3/16"	3/16"	1 3/8"	Round	Keo	3285A621	00000	—	———	0
				1/4"	1/4"	1 1/2"	Round	Keo	3285A631	00000	—	———	0
				1/4"	1/4"	2"	Round	—	———	0	Melin Tool	3213A131	000000
				5/16"	1/4"	1 1/2"	Round	Keo	3285A641	00000	—	———	0
				3/8"	1/4"	1 3/4"	Round	Keo	3285A651	00000	—	———	0
				3/8"	1/4"	2"	Round	—	———	0	Melin Tool	3213A151	00000
				1/2"	3/8"	2"	Round	Keo	3285A661	00000	Melin Tool	3213A161	00000
				5/8"	3/8"	2 1/4"	Round	Keo	3285A671	00000	Melin Tool	3213A171	00000
				3/4"	1/2"	2 5/8"	Round	Keo	3285A681	00000	—	———	0
				3/4"	1/2"	2 3/4"	Round	—	———	0	Melin Tool	3213A181	00000


				7/8"	1/2"	2 3/4"	Round	Keo	3285A691	00000	Melin Tool	3213A191	00000
				1"	1/2"	2 3/4"	Round	Keo	3285A711	00000	Melin Tool	3213A211	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	3285A721	00000	—	———	0
				1 1/4"	1/2"	3"	Round	—	———	0	Melin Tool	3213A221	000000
				1 1/2"	3/4"	2 7/8"	Round	Keo	3285A731	000000	Keo	3213A231	000000
				2"	3/4"	3 1/4"	Round	Keo	3285A741	000000	Keo	3213A241	000000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Titanium Carbon Nitride (TiCN) Coated—The hard, smooth finish prevents chipping and wear and reduces friction to keep material from building up.

Titanium Aluminum Nitride (TiAlN) Coated—Harder than TiCN, these countersinks cut without chipping in iron, titanium, and other metals as hard as Rockwell C50.

Aluminum Titanium Nitride (AlTiN) Coated—Our hardest and most wear-resistant countersinks, these cut through metals as hard as Rockwell C70 without losing their sharp cutting edges.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.					Uncoated		Titanium Carbon Nitride (TiCN) Coated		Titanium Aluminum Nitride (TiAlN) Coated		Aluminum Titanium Nitride (AlTiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each		Each		Each		Each
6 Flutes







				60° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Ultra Tool	2923A42	000000	2944A511	000000	2944A514	000000	2944A621	000000


				3/16"	3/16"	2"	Round	Ultra Tool	2923A11	00000	2944A521	00000	2944A524	00000	2944A625	00000
				1/4"	1/4"	2"	Round	Ultra Tool	2923A12	00000	2944A531	00000	2944A534	00000	2944A629	00000
				5/16"	1/4"	2 5/8"	Round	Ultra Tool	2923A451	00000	2944A811	00000	2944A815	00000	2944A819	00000
				3/8"	1/4"	2 5/8"	Round	Ultra Tool	2923A13	00000	2944A541	00000	2944A544	00000	2944A634	00000
				1/2"	1/4"	2 5/8"	Round	Ultra Tool	2923A14	00000	2944A551	00000	2944A554	00000	2944A638	00000
				5/8"	3/8"	2 3/4"	Round	Ultra Tool	2923A15	00000	2944A561	00000	2944A564	00000	2944A643	00000
				3/4"	3/8"	2 3/4"	Round	Ultra Tool	2923A16	00000	2944A571	000000	2944A574	000000	2944A647	000000
				1"	1/2"	3"	Round	Ultra Tool	2923A27	000000	2944A581	000000	2944A584	000000	2944A652	000000
				1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	2923A46	000000	2944A591	000000	2944A594	000000	2944A656	000000
				1 1/2"	3/4"	3 1/4"	Round	Ultra Tool	2923A47	000000	2944A611	000000	2944A614	000000	2944A661	000000

Countersink Sets for Screws

Cut cone-shaped recesses for screws of various diameters so the screw head sit flush with the surface. Choose an 82° countersink angle for inch screws or a 90° countersink angle for metric screws.

High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Carbide—The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these can last 50% longer than uncoated countersinks.

Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.

Titanium Carbon Nitride (TiCN) Coated—The hard, smooth finish prevents chipping and wear and reduces friction to keep material from building up.

Titanium Aluminum Nitride (TiAlN) Coated—Harder than TiCN, these countersinks cut without chipping in iron, titanium, and other metals as hard as Rockwell C50.

Aluminum Titanium Nitride (AlTiN) Coated—Our hardest and most wear-resistant countersinks, these cut through metals as hard as Rockwell C70 without losing their sharp cutting edges.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

								82° Countersink Angle		90° Countersink Angle
	No. of Flutes	Body Dia. Included	No. of Pieces	Finish	Shank Type	Container Type	Mfr.		Each		Each
High-Speed Steel



		6	1/4", 1/2", 3/4", 1"	4	Titanium Nitride (TiN) Coated	Round	Plastic Case	M. A. Ford	3210A813	0000000	3210A814	0000000


		6	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1"	7	Black Oxide	Round	Plastic Case	Keo	3098A61	000000	3098A63	000000


		Carbide



				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Metal Case	Ultra Tool	2923A37	000000	2923A39	000000


				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Carbon Nitride (TiCN) Coated	Round	Metal Case	Ultra Tool	2944A732	000000	2944A733	000000
				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Aluminum Nitride (TiAlN) Coated	Round	Metal Case	Ultra Tool	2944A735	000000	2944A736	000000
				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Aluminum Titanium Nitride (AlTiN) Coated	Round	Metal Case	Ultra Tool	2944A762	000000	2944A763	000000

Countersinks with Two Countersinking Ends for Rivets

When one end starts to wear, flip the tool around for a fresh cutting edge.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				100° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A51	000000


				3/16"	3/16"	2"	Round	Melin Tool	27885A56	00000
				1/4"	1/4"	2"	Round	Melin Tool	27885A53	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27885A54	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27885A55	00000
				1/2"	1/2"	3"	Round	Melin Tool	27885A86	00000
				5/8"	5/8"	3 1/2"	Round	Melin Tool	27885A57	00000
				3/4"	3/4"	4"	Round	Melin Tool	27885A58	00000




						120° Countersink Angle

						1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A71	00000


						3/16"	3/16"	2"	Round	Melin Tool	27885A72	00000
						1/4"	1/4"	2"	Round	Melin Tool	27885A73	00000
						5/16"	5/16"	2 1/2"	Round	Melin Tool	27885A74	00000
						3/8"	3/8"	2 1/2"	Round	Melin Tool	27885A75	00000
						1/2"	1/2"	3"	Round	Melin Tool	27885A76	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				100° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A51	000000


				3/16"	3/16"	2"	Round	Melin Tool	27655A52	00000
				1/4"	1/4"	2"	Round	Melin Tool	27655A53	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27655A54	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27655A55	00000
				1/2"	1/2"	3"	Round	Melin Tool	27655A56	000000




						120° Countersink Angle

						1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A71	00000


						3/16"	3/16"	2"	Round	Melin Tool	27655A72	00000
						1/4"	1/4"	2"	Round	Melin Tool	27655A73	00000
						5/16"	5/16"	2 1/2"	Round	Melin Tool	27655A74	00000
						3/8"	3/8"	2 1/2"	Round	Melin Tool	27655A75	00000
						1/2"	1/2"	3"	Round	Melin Tool	27655A76	000000
						5/8"	5/8"	3 1/2"	Round	Melin Tool	27655A77	000000
						3/4"	3/4"	4"	Round	Melin Tool	27655A78	000000

Precise-Cutting Countersinks for Lathe Centers

The go-to countersinks for CNC machining and other high-volume, high-precision jobs. Ground in the U.S. to a tight tolerance of 0" to 0.001", they cut dozens or even hundreds of countersunk holes with the same depth, diameter, and clean finish every time.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/4"	1/4"	0.078"	2"	Round	0" to 0.001"	Melin Tool	3214A11	000000


				3/8"	1/4"	1/8"	2"	Round	0" to 0.001"	Melin Tool	3214A13	00000
				1/2"	3/8"	0.156"	2"	Round	0" to 0.001"	Melin Tool	3214A15	00000
				5/8"	3/8"	0.203"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A17	00000
				3/4"	1/2"	1/4"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A19	00000
				1"	1/2"	0.328"	2 3/4"	Round	0" to 0.001"	Melin Tool	3214A24	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/4"	1/4"	0.078"	2"	Round	0" to 0.001"	Melin Tool	3308A31	000000


				3/8"	1/4"	1/8"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A33	00000
				1/2"	3/8"	0.156"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A35	00000
				5/8"	3/8"	0.203"	2 5/8"	Round	0" to 0.001"	Melin Tool	3308A37	000000
				3/4"	1/2"	1/4"	2 3/4"	Round	0" to 0.001"	Melin Tool	3308A39	000000
				1"	1/2"	0.328"	3"	Round	0" to 0.001"	Melin Tool	3308A44	000000

Long-Reach Countersinks for Screws

At around twice the length of our standard countersinks, these give you access to hard-to-reach holes. They're more prone to wobbling than shorter countersinks, so consider using a drill press or other rigid tool setup.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Number of Flutes—Countersinks with fewer flutes reduce chatter, so you can run them at high speeds. Countersinks with a higher number of flutes remove more material per revolution, leaving a smoother finish and extending tool life.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				82° Countersink Angle

				1/8"	1/8"	4"	Round	Melin Tool	3195A21	000000


				3/16"	3/16"	4"	Round	Melin Tool	3195A22	00000
				1/4"	1/4"	6"	Round	Melin Tool	3195A23	00000
				5/16"	5/16"	6"	Round	Melin Tool	3195A24	00000
				3/8"	3/8"	6"	Round	Melin Tool	3195A25	00000
				1/2"	3/8"	6"	Round	Melin Tool	3195A26	00000
				5/8"	3/8"	6"	Round	Melin Tool	3195A27	00000
				3/4"	1/2"	6"	Round	Melin Tool	3195A28	00000
				1"	1/2"	6"	Round	Melin Tool	3195A29	000000

Countersinks with Two Countersinking Ends for Lathe Centers

When one end starts to wear, flip the tool around for a fresh cutting edge. These countersinks cut a profiled recess for your lathe center to keep the workpiece aligned as it spins. They match the 60° angle on both rotating and stationary centers.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A21	000000


				3/16"	3/16"	2"	Round	Melin Tool	27885A22	00000
				1/4"	1/4"	2"	Round	Melin Tool	27885A23	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27885A24	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27885A25	00000
				1/2"	1/2"	3"	Round	Melin Tool	27885A26	00000
				5/8"	5/8"	3 1/2"	Round	Melin Tool	27885A27	00000
				3/4"	3/4"	4"	Round	Melin Tool	27885A28	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
6 Flutes







				60° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A21	000000


				3/16"	3/16"	2"	Round	Melin Tool	27655A22	00000
				1/4"	1/4"	2"	Round	Melin Tool	27655A23	00000
				5/16"	5/16"	2 1/2"	Round	Melin Tool	27655A24	00000
				3/8"	3/8"	2 1/2"	Round	Melin Tool	27655A25	00000
				1/2"	1/2"	3"	Round	Melin Tool	27655A26	000000
				5/8"	5/8"	3 1/2"	Round	Melin Tool	27655A27	000000
				3/4"	3/4"	4"	Round	Melin Tool	27655A28	000000

Precise-Cutting Countersinks for Rivets

The go-to countersinks for CNC machining and other high-volume, high-precision jobs. Ground in the U.S. to a tight tolerance of 0" to 0.001", they cut dozens or even hundreds of countersunk holes with the same depth, diameter, and clean finish every time.

High-Speed Steel

6 Flutes

These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				100° Countersink Angle

				1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3214A123	000000


				3/8"	1/4"	0.078"	2"	Round	0" to 0.001"	Melin Tool	3214A143	00000
				1/2"	3/8"	0.109"	2"	Round	0" to 0.001"	Melin Tool	3214A163	00000
				5/8"	3/8"	1/8"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A183	00000
				3/4"	1/2"	0.156"	2 1/4"	Round	0" to 0.001"	Melin Tool	3214A213	00000
				1"	1/2"	0.203"	2 3/4"	Round	0" to 0.001"	Melin Tool	3214A253	00000

Carbide

6 Flutes

The hardest and most wear-resistant countersinks you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so use a rigid machine tool holder to prevent breakage.

Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.

	Dia.						Uncoated
	Body	Shank	For Min. Hole Dia.	Overall Lg.	Shank Type	Diameter Tolerance	Mfr.		Each
6 Flutes







				100° Countersink Angle

				1/4"	1/4"	0.046"	2"	Round	0" to 0.001"	Melin Tool	3308A323	000000


				3/8"	1/4"	0.078"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A343	00000
				1/2"	3/8"	0.109"	2 1/2"	Round	0" to 0.001"	Melin Tool	3308A363	00000
				5/8"	3/8"	1/8"	2 5/8"	Round	0" to 0.001"	Melin Tool	3308A383	000000
				3/4"	1/2"	0.156"	2 3/4"	Round	0" to 0.001"	Melin Tool	3308A413	000000
				1"	1/2"	0.203"	3"	Round	0" to 0.001"	Melin Tool	3308A453	000000

Countersink Sets for Lathe Centers

Cut holes for a range of lathe-center diameters. The 60° angle creates a precise recess for both rotating and stationary lathe centers, keeping your workpiece aligned as it spins.