100° Countersinks | McMaster-Carr

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Countersink Angle

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Material

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Countersink Type

For Cutting

Finish

Aluminum Titanium Nitride (AlTiN) Coated

Black Oxide

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Carbon Nitride (TiCN) Coated

Titanium Nitride (TiN) Coated

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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Exempt

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Drill Tip Diameter

Body Diameters Included

337 Products

About Countersinks

Choose the right countersink angle, body diameter, and number of flutes for your application.

Material

High-Speed Steel

Make accurate cuts in most materials without chipping or cracking

124 products

Cobalt Steel

Resist higher temperatures and last twice as long as high-speed steel

47 products

Material

Carbide

The hardest and most wear-resistant countersinks you can buy

166 products

Flute Type

Fluteless

The hollow body minimizes vibration for steady cutting

6 products

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

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.				Uncoated			Black Oxide			Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each	Mfr.		Each	Mfr.		Each
1 Flute







				100° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	2846A69	000000	—	———	0	Keo	3210A214	000000


				3/16"	3/16"	1 3/8"	Round	Keo	2846A74	00000	—	———	0	Keo	3210A224	00000
				1/4"	1/4"	1 1/2"	Round	Keo	2846A75	00000	—	———	0	Keo	3210A234	00000
				3/8"	1/4"	1 3/4"	Round	Keo	2846A76	00000	—	———	0	Keo	3210A244	00000
				1/2"	1/4"	2"	Round	Keo	2846A77	00000	—	———	0	Keo	3210A254	00000
				5/8"	3/8"	2 1/4"	Round	Keo	2846A78	00000	—	———	0	Keo	3210A264	00000
				3/4"	1/2"	2 5/8"	Round	Keo	2846A79	00000	—	———	0	Keo	3210A274	00000
				1"	1/2"	2 3/4"	Round	Keo	2846A81	00000	—	———	0	Keo	3210A284	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	2846A82	00000	—	———	0	Keo	3210A294	000000
				1 1/2"	3/4"	2 7/8"	Round	Keo	2846A83	000000	—	———	0	Keo	3210A314	000000
				1 3/4"	3/4"	3"	Round	Keo	2846A84	000000	—	———	0	Keo	3210A324	000000


				2"	3/4"	3 1/4"	Round	Keo	2846A85	000000	—	———	0	Keo	3210A334	000000


				3 Flutes







								100° Countersink Angle

								1/4"	1/4"	1 1/2"	Round	Keo	3013A61	00000	—	———	0	—	———	0


								1/4"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A414	00000
								3/8"	1/4"	1 3/4"	Round	Keo	3013A62	00000	—	———	0	—	———	0
								3/8"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A424	00000
								1/2"	1/4"	2"	Round	Keo	3013A63	00000	—	———	0	—	———	0
								1/2"	3/8"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A434	00000
								5/8"	3/8"	2 1/4"	Round	Keo	3013A64	00000	—	———	0	Melin Tool	3210A444	00000
								3/4"	1/2"	2 5/8"	Round	Keo	3013A65	00000	—	———	0	—	———	0
								3/4"	1/2"	2 3/4"	Round	—	———	0	—	———	0	Melin Tool	3210A454	00000
								1"	1/2"	2 3/4"	Round	Keo	3013A66	00000	—	———	0	Melin Tool	3210A464	00000


								6 Flutes







												100° Countersink Angle

												1/8"	1/8"	1 1/4"	Round	—	———	0	Keo	3098A391	000000	Keo	3210A614	00000


3/16"												3/16"	1 3/8"	Round	—	———	0	Keo	3098A41	00000	Keo	3210A624	00000
1/4"	1/4"											1 1/2"	Round	—	———	0	Keo	3098A42	00000	Keo	3210A634	00000
5/16"	1/4"											1 3/4"	Round	—	———	0	Keo	3098A43	00000	Keo	3210A644	00000
3/8"	1/4"											1 3/4"	Round	—	———	0	Keo	3098A44	00000	Keo	3210A654	00000
1/2"	3/8"											2"	Round	—	———	0	Keo	3098A45	00000	Keo	3210A664	00000
5/8"	3/8"	2 1/4"										Round	—	———	0	Keo	3098A46	00000	Keo	3210A674	00000
3/4"	1/2"	2 5/8"	Round									—	———	0	Keo	3098A47	00000	Keo	3210A684	00000
7/8"	1/2"	2 3/4"	Round									—	———	0	Keo	3098A48	00000	Keo	3210A694	00000
1"	1/2"	2 3/4"	Round									—	———	0	Keo	3098A49	00000	Keo	3210A714	00000
1 1/4"	1/2"	2 3/4"	Round									—	———	0	Keo	3098A74	00000	Keo	3210A724	000000


1 1/2"	3/4"	2 7/8"	Round									—	———	0	Keo	3098A84	000000	Keo	3210A734	000000
2"	3/4"	3 1/4"	Round									—	———	0	Keo	3098A89	000000	Keo	3210A744	000000

Cobalt Steel

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.

	Dia.				Uncoated			Black Oxide			Titanium Nitride (TiN) Coated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each	Mfr.		Each	Mfr.		Each
1 Flute







				100° Countersink Angle

				3/16"	3/16"	1 1/2"	Round	—	———	0	—	———	0	Melin Tool	3213A324	000000


				1/4"	1/4"	2"	Round	Melin Tool	3285A334	000000	—	———	0	Melin Tool	3213A334	00000
				3/8"	1/4"	2"	Round	Melin Tool	3285A344	00000	—	———	0	Melin Tool	3213A344	00000
				1/2"	3/8"	2"	Round	Melin Tool	3285A354	00000	—	———	0	Melin Tool	3213A354	00000
				5/8"	3/8"	2 1/4"	Round	Melin Tool	3285A364	00000	—	———	0	Melin Tool	3213A364	00000
				3/4"	1/2"	2 3/4"	Round	Melin Tool	3285A374	00000	—	———	0	Melin Tool	3213A374	00000
				1"	1/2"	2 3/4"	Round	—	———	0	—	———	0	Melin Tool	3213A384	00000


				3 Flutes







								100° Countersink Angle

								1/4"	1/4"	2"	Round	Melin Tool	3285A444	00000	—	———	0	Melin Tool	3213A514	00000


								3/8"	1/4"	2"	Round	Melin Tool	3285A454	00000	—	———	0	Melin Tool	3213A524	00000
								1/2"	3/8"	2"	Round	Melin Tool	3285A464	00000	—	———	0	Melin Tool	3213A534	00000
								5/8"	3/8"	2 1/4"	Round	Melin Tool	3285A474	00000	—	———	0	Melin Tool	3213A544	00000
								3/4"	1/2"	2 3/4"	Round	Melin Tool	3285A484	00000	—	———	0	Melin Tool	3213A554	00000
								1"	1/2"	2 3/4"	Round	Melin Tool	3285A494	00000	—	———	0	Melin Tool	3213A564	00000


								6 Flutes







												100° Countersink Angle

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


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


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

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.

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.

	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
1 Flute







				100° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Ultra Tool	2922A431	000000	2944A117	000000	2944A118	000000	2944A214	000000


				3/16"	3/16"	2"	Round	Ultra Tool	2922A432	00000	2944A127	00000	2944A128	00000	2944A218	00000
				1/4"	1/4"	2"	Round	Ultra Tool	2922A433	00000	2944A137	00000	2944A138	00000	2944A222	00000
				5/16"	1/4"	2 5/8"	Round	Ultra Tool	2922A37	00000	2944A827	00000	2944A832	00000	2944A836	00000
				3/8"	1/4"	2 5/8"	Round	Ultra Tool	2922A434	00000	2944A147	00000	2944A148	00000	2944A226	00000
				1/2"	1/4"	2 5/8"	Round	Ultra Tool	2922A435	00000	2944A157	00000	2944A158	00000	2944A23	00000
				5/8"	3/8"	2 3/4"	Round	Ultra Tool	2922A436	00000	2944A167	00000	2944A168	00000	2944A234	00000
				3/4"	3/8"	2 3/4"	Round	Ultra Tool	2922A437	000000	2944A177	000000	2944A178	000000	2944A238	000000
				1"	1/2"	3"	Round	Ultra Tool	2922A438	000000	2944A187	000000	2944A188	000000	2944A242	000000
				1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	2922A439	000000	2944A197	000000	2944A198	000000	2944A246	000000


				3 Flutes







								100° Countersink Angle

								1/8"	1/8"	1 1/2"	Round	Ultra Tool	29485A224	00000	2944A317	00000	2944A318	00000	2944A404	00000


								3/16"	3/16"	2"	Round	Ultra Tool	29485A234	00000	2944A327	00000	2944A328	00000	2944A408	00000
								1/4"	1/4"	2"	Round	Ultra Tool	29485A114	00000	2944A337	00000	2944A338	00000	2944A413	00000
								5/16"	1/4"	2 5/8"	Round	Ultra Tool	29485A184	00000	2944A841	00000	2944A845	00000	2944A849	00000
								3/8"	1/4"	2 5/8"	Round	Ultra Tool	29485A124	00000	2944A347	00000	2944A348	00000	2944A417	00000
								1/2"	1/4"	2 5/8"	Round	Ultra Tool	29485A134	00000	2944A357	00000	2944A358	00000	2944A422	00000
								5/8"	3/8"	2 3/4"	Round	Ultra Tool	29485A144	00000	2944A367	00000	2944A368	00000	2944A426	00000
								3/4"	3/8"	2 3/4"	Round	Ultra Tool	29485A154	00000	2944A377	000000	2944A378	000000	2944A431	000000
								1"	1/2"	3"	Round	Ultra Tool	29485A164	000000	2944A387	000000	2944A388	000000	2944A435	000000
								1 1/4"	3/4"	3 1/4"	Round	Ultra Tool	29485A174	000000	2944A397	000000	2944A398	000000	2944A439	000000


								6 Flutes







												100° Countersink Angle

												1/8"	1/8"	1 1/2"	Round	Ultra Tool	2923A431	00000	2944A517	00000	2944A518	00000	2944A624	00000


												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

Fluteless Smooth-Finish Countersinks for Rivets

With a hollow body and single cutting edge, these countersinks make less contact with the hole than solid-body countersinks. The reduced friction minimizes vibration and leaves a more accurate, tight-fitting recess for your screw head.

High-Speed Steel

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

		Dia.				Uncoated
	For Hole Dia.	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
0 Flutes







				100° Countersink Angle

				5/32" to 13/32"	7/16"	1/4"	1 21/32"	Round	Republic Drill	2739A59	000000


				3/16" to 17/32"	9/16"	1/4"	1 7/8"	Round	Republic Drill	2739A61	00000
				5/16" to 25/32"	13/16"	1/2"	2 5/8"	Round	Republic Drill	2739A62	00000
				9/16" to 1 1/16"	1 1/8"	1/2"	2 29/32"	Round	Republic Drill	2739A63	00000

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.

	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

	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

Drill-Point Countersinks for Rivets

Save time by drilling a pilot hole and countersinking in a single step. These countersinks have a small drill point to drill new pilot holes topped with cone-shaped recesses for rivet heads.

High-Speed Steel

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.

	Dia.					Black Oxide
	Body	Shank	Drill Tip Dia.	Overall Lg.	Shank Type	Mfr.		Each
4 Flutes







				100° Countersink Angle

				1/8"	1/8"	0.041"	1 1/2"	Round	Melin Tool	27535A55	000000


				3/16"	3/16"	0.062"	1 1/2"	Round	Melin Tool	27535A56	00000
				1/4"	1/4"	0.082"	2"	Round	Melin Tool	27535A57	00000
				5/16"	1/4"	0.104"	2"	Round	Melin Tool	27535A58	00000
				3/8"	1/4"	0.125"	2"	Round	Melin Tool	27535A59	00000
				1/2"	3/8"	0.167"	2"	Round	Melin Tool	27535A61	00000
				5/8"	3/8"	0.208"	2 1/4"	Round	Melin Tool	27535A62	00000
				3/4"	1/2"	0.250"	2 3/4"	Round	Melin Tool	27535A63	00000
				7/8"	1/2"	0.291"	2 3/4"	Round	Melin Tool	27535A64	00000
				1"	1/2"	0.333"	2 3/4"	Round	Melin Tool	27535A65	00000

Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Rivets

When one end starts to wear, flip the tool around for a fresh cutting edge. The hollow body minimizes vibration while lifting chips out of the hole for a smooth, accurate finish. Also known as zero-flute countersinks.

High-Speed Steel

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

		Dia.				Uncoated
	For Hole Dia.	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
0 Flutes







				100° Countersink Angle

				1/16" to 15/64"	1/4"	1/4"	1 7/8"	Round	Republic Drill	2739A58	000000

Smooth-Finish Countersinks for Rivets

Make smooth, uniform cuts without stopping to clear chips. Spiral-flute cutting edges lift chips out of the hole as you cut so they don't clog the tool.

High-Speed Steel

3 Flutes

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

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







				100° Countersink Angle

				1/4"	1/4"	1 1/4"	Round	M. A. Ford	2742A34	000000


				3/8"	1/4"	1 5/8"	Round	M. A. Ford	2742A35	00000
				1/2"	1/4"	2"	Round	M. A. Ford	2742A36	00000
				5/8"	1/4"	2 1/4"	Round	M. A. Ford	2742A37	00000
				3/4"	1/2"	3"	Round	M. A. Ford	2742A38	00000
				1"	1/2"	3 1/4"	Round	M. A. Ford	2742A41	00000
				1 1/4"	5/8"	3 1/2"	Round	M. A. Ford	2742A56	000000
				1 1/2"	3/4"	3 7/8"	Round	M. A. Ford	2742A57	000000
				2"	3/4"	4 1/4"	Round	M. A. Ford	2742A58	000000

Fluteless Smooth-Finish Countersink Sets for Rivets

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

			For Hole Dia.					100° Countersink Angle
	No. of Flutes	No. of Pieces	1/4" Shank	1/2" Shank	Finish	Shank Type	Container Type	Mfr.		Each
High-Speed Steel



		0	5	1/16", 5/32", 3/16"	5/16", 9/16"	Uncoated	Round	Wood Stand	Republic Drill	2739A28	0000000

Two-Piece Long-Reach Countersinks for Rivets

Create a custom-length countersink for access to hard-to-reach holes. These tools are used in angle drills and hand drivers for countersinking and deburring. For maximum stability, choose the shortest extension that works for your application.

High-Speed Steel


2 Flutes	Countersink Extensions

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

	Countersinks							4" Overall Length Countersink Extensions		6" Overall Length Countersink Extensions		12" Overall Length Countersink Extensions
	Dia.				Uncoated
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each		Each		Each		Each
2 Flutes







				100° Countersink Angle

				3/8"	1/4"	3/4"	Threaded	Craig Tools	3109A41	000000	3109A71	000000	3109A72	000000	3109A73	000000


				1/2"	1/4"	3/4"	Threaded	Craig Tools	3109A42	00000	3109A71	00000	3109A72	00000	3109A73	00000

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.

	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

Carbide

6 Flutes

	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

Drill-Point Countersinks with Two Countersinking Ends for Rivets

When one end starts to wear, flip the tool around for a fresh cutting edge. These countersinks have a small drill point to drill new pilot holes topped with cone-shaped recesses for rivet heads.

Carbide

4 Flutes

	Dia.					Uncoated
	Body	Shank	Drill Tip Dia.	Overall Lg.	Shank Type	Mfr.		Each
4 Flutes







				100° Countersink Angle

				1/8"	1/8"	0.041"	1 1/2"	Round	Melin Tool	3290A514	000000


				3/16"	3/16"	0.062"	2"	Round	Melin Tool	3290A524	00000
				1/4"	1/4"	0.082"	2"	Round	Melin Tool	3290A534	00000
				5/16"	5/16"	0.104"	2 1/2"	Round	Melin Tool	3290A544	00000
				3/8"	3/8"	0.125"	2 1/2"	Round	Melin Tool	3290A554	00000
				1/2"	1/2"	0.167"	3"	Round	Melin Tool	3290A564	000000

Countersink Sets for Rivets

Cut cone-shaped recesses for rivets of various diameters so the head sits flush with the surface.

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 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.

							100° Countersink Angle
	No. of Flutes	Body Dia. Included	No. of Pieces	Finish	Shank Type	Container Type	Mfr.		Each
High-Speed Steel



		1	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	Keo	2846A116	0000000


		3	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	Keo	3012A14	000000
		6	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1"	7	Black Oxide	Round	Plastic Case	Keo	3098A64	000000


		Carbide



				1	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Metal Case	Ultra Tool	2922A441	000000


				1	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Carbon Nitride (TiCN) Coated	Round	Metal Case	Ultra Tool	2944A718	000000
				1	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Aluminum Nitride (TiAlN) Coated	Round	Metal Case	Ultra Tool	2944A717	000000
				1	1/4", 3/8", 1/2", 5/8", 3/4"	5	Aluminum Titanium Nitride (AlTiN) Coated	Round	Metal Case	Ultra Tool	2944A744	000000
				3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Metal Case	Ultra Tool	29485A214	000000
				3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Carbon Nitride (TiCN) Coated	Round	Metal Case	Ultra Tool	2944A728	000000
				3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Aluminum Nitride (TiAlN) Coated	Round	Metal Case	Ultra Tool	2944A727	000000
				3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Aluminum Titanium Nitride (AlTiN) Coated	Round	Metal Case	Ultra Tool	2944A754	000000
				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Metal Case	Ultra Tool	2923A391	000000
				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Carbon Nitride (TiCN) Coated	Round	Metal Case	Ultra Tool	2944A738	000000
				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Titanium Aluminum Nitride (TiAlN) Coated	Round	Metal Case	Ultra Tool	2944A737	000000


				6	1/4", 3/8", 1/2", 5/8", 3/4"	5	Aluminum Titanium Nitride (AlTiN) Coated	Round	Metal Case	Ultra Tool	2944A764	000000

Reverse Countersinks for Rivets

If an obstruction blocks access for standard countersinks, these tools enter from the reverse side instead. They're often used to add countersunk holes to surfaces in preassembled parts. Put the shank (sold separately) in your drill chuck and insert it all the way through the hole. Then reach into the confined space to stick the countersink head onto the shank. Pull back on the drill to countersink the hole.

High-Speed Steel

3 Flutes

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

	Countersinks						Required Shanks
				Uncoated
	Body Dia.	For Hole Dia.	Overall Lg.	Mfr.		Each	Shank Dia.	Overall Lg.		Each
3 Flutes







				100° Countersink Angle

				5/16"	3/32"	1/2"	Craig Tools	3309A11	000000	3/32"	6"	3309A31	00000


				5/16"	1/8"	1/2"	Craig Tools	3309A12	00000	1/8"	6"	3309A32	0000
				5/16"	5/32"	1/2"	Craig Tools	3309A13	00000	5/32"	6"	3309A33	0000
				3/8"	1/8"	1/2"	Craig Tools	3309A14	00000	1/8"	6"	3309A32	0000
				3/8"	5/32"	1/2"	Craig Tools	3309A15	00000	5/32"	6"	3309A33	0000
				3/8"	3/16"	1/2"	Craig Tools	3309A16	00000	3/16"	6"	3309A34	00000
				1/2"	5/32"	1/2"	Craig Tools	3309A17	00000	5/32"	6"	3309A33	0000
				1/2"	3/16"	1/2"	Craig Tools	3309A18	00000	3/16"	6"	3309A34	00000
				1/2"	1/4"	1/2"	Craig Tools	3309A19	00000	1/4"	6"	3309A35	00000

Carbide-Insert Countersinks for Rivets

Your best bet for countersinking dozens or even hundreds of holes economically. When the blade begins to wear, rotate the insert to expose a fresh cutting edge. Once all the edges are worn, pop on a new insert instead of sharpening or throwing away your countersink.

Carbide

With Square

Insert

	Countersinks												Replacement Screws
						Insert				Uncoated
	Shank Dia.	For Hole Dia.	For Min. Hole Dia.	Overall Lg.	Shank Type	Shape	Code	Size	Thk.	Mfr.		Each		Each
1 Flute







				100° Countersink Angle

				1/2"	1/4" to 3/4"	1/4"	2 3/8"	Round	Triangle	TPGH-321	3/8"	1/8"	Republic Drill	29245A81	0000000	29245A96	00000


				1/2"	1/2" to 1 3/4"	1/2"	2 3/8"	Round	Square	SPGH-433	1/2"	3/16"	Republic Drill	29245A82	000000	29245A96	0000
				3/4"	1 1/4" to 2 1/2"	1 1/4"	2 3/8"	Round	Square	SPGH-433	1/2"	3/16"	Republic Drill	29245A83	000000	29245A96	0000

Replacement Carbide Inserts

Individual Carbide

Insert Case

Inserts sold individually come packed in a clear plastic case to protect cutting edges during shipment. Inserts sold in packs come factory sealed from the manufacturer for maximum traceability.

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

		Each		Package
Material	Insert Shape		Each	Pkg. Qty.		Pkg.
Uncoated Carbide	Triangle	29245A67	00000	10	29245A188	000000
Uncoated Carbide	Square	29245A68	00000	10	29245A291	000000
Titanium Nitride (TiN)-Coated Carbide	Triangle	29245A71	00000	10	29245A306	00000
Titanium Nitride (TiN)-Coated Carbide	Square	29245A72	00000	10	29245A918	000000

Smooth-Finish Countersink Sets for Rivets

Make smooth, uniform cuts without stopping to clear chips. Spiral-flute cutting edges lift chips out of the hole as you cut so they don't clog the tool.

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

							100° Countersink Angle
	No. of Flutes	Body Dia. Included	No. of Pieces	Finish	Shank Type	Container Type	Mfr.		Each
High-Speed Steel



		3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Plastic Case	M. A. Ford	2742A614	0000000