120° Countersinks | McMaster-Carr

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145 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

84 products

Cobalt Steel

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

46 products

Material

Carbide

The hardest and most wear-resistant countersinks you can buy

15 products

Flute Type

Spiral

Lift chips out of the hole so they don't clog the tool

10 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 are best for aggressive cutting. They leave more room for chips to clear, reducing friction and heat. Countersinks with more flutes spread the cut across more edges for better stability, a smoother finish, and longer tool life.

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







				120° Countersink Angle

				1/8"	1/8"	1 1/4"	Round	Keo	2846A101	000000	—	———	0	Keo	3210A215	000000


				3/16"	3/16"	1 3/8"	Round	Keo	2846A102	00000	—	———	0	Keo	3210A225	00000
				1/4"	1/4"	1 1/2"	Round	Keo	2846A103	00000	—	———	0	Keo	3210A235	00000
				3/8"	1/4"	1 3/4"	Round	Keo	2846A104	00000	—	———	0	Keo	3210A245	00000
				1/2"	1/4"	2"	Round	Keo	2846A105	00000	—	———	0	Keo	3210A255	00000
				5/8"	3/8"	2 1/4"	Round	Keo	2846A106	00000	—	———	0	Keo	3210A265	00000
				3/4"	1/2"	2 5/8"	Round	Keo	2846A107	00000	—	———	0	Keo	3210A275	00000
				1"	1/2"	2 3/4"	Round	Keo	2846A108	00000	—	———	0	Keo	3210A285	00000
				1 1/4"	1/2"	2 3/4"	Round	Keo	2846A109	00000	—	———	0	Keo	3210A295	000000


				3 Flutes







								120° Countersink Angle

								1/4"	1/4"	1 1/2"	Round	Keo	3013A81	00000	—	———	0	—	———	0


								1/4"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A415	00000
								3/8"	1/4"	1 3/4"	Round	Keo	3013A82	00000	—	———	0	—	———	0
								3/8"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A425	00000
								1/2"	1/4"	2"	Round	Keo	3013A83	00000	—	———	0	—	———	0
								1/2"	3/8"	2"	Round	—	———	0	—	———	0	Melin Tool	3210A435	00000
								5/8"	3/8"	2 1/4"	Round	Keo	3013A84	00000	—	———	0	Melin Tool	3210A445	00000
								3/4"	1/2"	2 5/8"	Round	Keo	3013A85	00000	—	———	0	—	———	0
								3/4"	1/2"	2 3/4"	Round	—	———	0	—	———	0	Melin Tool	3210A455	00000
								1"	1/2"	2 3/4"	Round	Keo	3013A86	00000	—	———	0	Melin Tool	3210A465	00000


								6 Flutes







												120° Countersink Angle

												1/8"	1/8"	1 1/4"	Round	—	———	0	Keo	3098A641	000000	Keo	3210A616	00000


												3/16"	3/16"	1 3/8"	Round	—	———	0	Keo	3098A642	00000	Keo	3210A626	0000
												1/4"	1/4"	1 1/2"	Round	—	———	0	Keo	3098A643	00000	Keo	3210A636	00000
												5/16"	1/4"	1 3/4"	Round	—	———	0	Keo	3098A644	00000	Keo	3210A646	00000
												3/8"	1/4"	1 3/4"	Round	—	———	0	Keo	3098A645	00000	Keo	3210A656	00000
												1/2"	3/8"	2"	Round	—	———	0	Keo	3098A646	00000	Keo	3210A666	00000
5/8"												3/8"	2 1/4"	Round	—	———	0	Keo	3098A647	00000	Keo	3210A676	00000
3/4"	1/2"											2 5/8"	Round	—	———	0	Keo	3098A648	00000	Keo	3210A68	00000
7/8"	1/2"											2 3/4"	Round	—	———	0	Keo	3098A649	00000	Keo	3210A696	00000
1"	1/2"											2 3/4"	Round	—	———	0	Keo	3098A651	00000	Keo	3210A716	00000
1 1/4"	1/2"											2 3/4"	Round	—	———	0	Keo	3098A652	00000	Keo	3210A726	00000


1 1/2"	3/4"	2 7/8"	Round									—	———	0	Keo	3098A653	00000	Keo	3210A736	000000
2"	3/4"	3 1/4"	Round									—	———	0	Keo	3098A654	000000	Keo	3210A746	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







				120° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	—	———	0	—	———	0	Melin Tool	3213A315	000000


				1/4"	1/4"	2"	Round	Melin Tool	3285A335	000000	—	———	0	Melin Tool	3213A335	00000
				3/8"	1/4"	2"	Round	Melin Tool	3285A345	00000	—	———	0	Melin Tool	3213A345	00000
				1/2"	3/8"	2"	Round	Melin Tool	3285A355	00000	—	———	0	Melin Tool	3213A355	00000
				5/8"	3/8"	2 1/4"	Round	Melin Tool	3285A365	00000	—	———	0	Melin Tool	3213A365	00000
				3/4"	1/2"	2 3/4"	Round	Melin Tool	3285A375	00000	—	———	0	—	———	0
				1 1/2"	3/4"	3 1/2"	Round	—	———	0	—	———	0	Melin Tool	3213A415	000000


				3 Flutes







								120° Countersink Angle

								1/4"	1/4"	2"	Round	Melin Tool	3285A445	00000	—	———	0	Melin Tool	3213A515	00000


								3/8"	1/4"	2"	Round	Melin Tool	3285A455	00000	—	———	0	Melin Tool	3213A525	00000
								1/2"	3/8"	2"	Round	Melin Tool	3285A465	00000	—	———	0	Melin Tool	3213A535	00000
								5/8"	3/8"	2 1/4"	Round	Melin Tool	3285A475	00000	—	———	0	Melin Tool	3213A545	00000
								3/4"	1/2"	2 3/4"	Round	—	———	0	—	———	0	Melin Tool	3213A555	00000
								1"	1/2"	2 3/4"	Round	—	———	0	—	———	0	Melin Tool	3213A565	00000


								6 Flutes







												120° Countersink Angle

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


												1/8"	1/8"	1 1/2"	Round	—	———	0	—	———	0	Melin Tool	3213A116	00000
												3/16"	3/16"	1 3/8"	Round	—	———	0	Keo	3285A626	00000	—	———	0
												3/16"	3/16"	1 1/2"	Round	—	———	0	—	———	0	Melin Tool	3213A126	00000
												1/4"	1/4"	1 1/2"	Round	—	———	0	Keo	3285A636	0000	—	———	0
												1/4"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3213A136	00000
												5/16"	1/4"	1 1/2"	Round	—	———	0	Keo	3285A646	00000	—	———	0
												5/16"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3213A146	00000
												3/8"	1/4"	1 3/4"	Round	—	———	0	Keo	3285A656	00000	—	———	0
												3/8"	1/4"	2"	Round	—	———	0	—	———	0	Melin Tool	3213A156	00000
												1/2"	3/8"	2"	Round	—	———	0	Keo	3285A666	00000	Melin Tool	3213A166	00000


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

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







				120° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27885A71	000000


				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.

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







				120° Countersink Angle

				1/8"	1/8"	1 1/2"	Round	Melin Tool	27655A71	000000


				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	000000
				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

Smooth-Finish Countersinks for Rivets

Spiral flutes on these countersinks minimize vibration to cut a smooth hole that snugly fits your rivet head. The flutes also lift chips out of the hole, so you don’t have to stop to clear them.

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







				120° Countersink Angle

				1/4"	1/4"	1 1/4"	Round	M. A. Ford	2742A73	000000


				3/8"	1/4"	1 5/8"	Round	M. A. Ford	2742A74	00000
				1/2"	1/4"	2"	Round	M. A. Ford	2742A75	00000
				5/8"	1/4"	2 1/4"	Round	M. A. Ford	2742A76	00000
				3/4"	1/2"	3"	Round	M. A. Ford	2742A77	00000
				1"	1/2"	3 1/4"	Round	M. A. Ford	2742A79	00000
				1 1/4"	5/8"	3 1/2"	Round	M. A. Ford	2742A82	000000
				1 1/2"	3/4"	3 7/8"	Round	M. A. Ford	2742A83	000000
				2"	3/4"	4 1/4"	Round	M. A. Ford	2742A84	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







				120° Countersink Angle

				1/8"	1/8"	0.041"	1 1/2"	Round	Melin Tool	27535A77	000000


				3/16"	3/16"	0.062"	1 1/2"	Round	Melin Tool	27535A78	00000
				1/4"	1/4"	0.082"	2"	Round	Melin Tool	27535A79	00000
				5/16"	1/4"	0.104"	2"	Round	Melin Tool	27535A81	00000
				3/8"	1/4"	0.125"	2"	Round	Melin Tool	27535A82	00000
				1/2"	3/8"	0.167"	2"	Round	Melin Tool	27535A83	00000
				5/8"	3/8"	0.208"	2 1/4"	Round	Melin Tool	27535A84	00000
				3/4"	1/2"	0.250"	2 3/4"	Round	Melin Tool	27535A85	00000
				1"	1/2"	0.333"	2 3/4"	Round	Melin Tool	27535A87	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







				120° Countersink Angle

				1/8"	1/8"	0.041"	1 1/2"	Round	Melin Tool	3290A516	000000


				3/16"	3/16"	0.062"	2"	Round	Melin Tool	3290A526	00000
				1/4"	1/4"	0.082"	2"	Round	Melin Tool	3290A536	00000
				5/16"	5/16"	0.104"	2 1/2"	Round	Melin Tool	3290A546	00000
				3/8"	3/8"	0.125"	2 1/2"	Round	Melin Tool	3290A556	000000
				1/2"	1/2"	0.167"	3"	Round	Melin Tool	3290A566	000000
				3/4"	3/4"	0.250"	4"	Round	Melin Tool	3290A586	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.

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.

							120° 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	2846A141	0000000


		3	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	Keo	3012A16	000000
		6	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1"	7	Black Oxide	Round	Plastic Case	Keo	3098A66	000000


		Cobalt Steel



				1	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	Keo	11187N14	000000


				3	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	Keo	11187N15	000000
				6	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1"	7	Uncoated	Round	Plastic Case	Keo	11187N16	000000

Smooth-Finish Countersink Sets for Rivets

Spiral flutes on the countersinks in these sets minimize vibration to cut smooth holes in a range of sizes that snugly fit your rivet head. The flutes also lift chips out of the hole, so you don’t have to stop to clear them.

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

							120° 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	2742A616	0000000