120° Countersinks | McMaster-Carr

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165 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

92 products

Cobalt Steel

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

58 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 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.

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





				120° Countersink Angle
				1/8"	1/8"	1 1/4"	Round	2846A101	000000	———	0	3210A215	000000
				3/16"	3/16"	1 3/8"	Round	2846A102	00000	———	0	3210A225	00000
				1/4"	1/4"	1 1/2"	Round	2846A103	00000	———	0	3210A235	00000
				3/8"	1/4"	1 3/4"	Round	2846A104	00000	———	0	3210A245	00000
				1/2"	1/4"	2"	Round	2846A105	00000	———	0	3210A255	00000
				5/8"	3/8"	2 1/4"	Round	2846A106	00000	———	0	3210A265	00000
				3/4"	1/2"	2 5/8"	Round	2846A107	00000	———	0	3210A275	00000
				1"	1/2"	2 3/4"	Round	2846A108	00000	———	0	3210A285	00000
				1 1/4"	1/2"	2 3/4"	Round	2846A109	00000	———	0	3210A295	000000
				1 1/2"	3/4"	2 7/8"	Round	2846A112	000000	———	0	3210A315	000000
				1 3/4"	3/4"	3"	Round	2846A113	000000	———	0	3210A325	000000
				2"	3/4"	3 1/4"	Round	2846A114	000000	———	0	3210A335	000000

				3 Flutes





								120° Countersink Angle
								1/4"	1/4"	1 1/2"	Round	3013A81	00000	———	0	———	0
								1/4"	1/4"	2"	Round	———	0	———	0	3210A415	00000
								3/8"	1/4"	1 3/4"	Round	3013A82	00000	———	0	———	0
								3/8"	1/4"	2"	Round	———	0	———	0	3210A425	00000
								1/2"	1/4"	2"	Round	3013A83	00000	———	0	———	0
								1/2"	3/8"	2"	Round	———	0	———	0	3210A435	00000
								5/8"	3/8"	2 1/4"	Round	3013A84	00000	———	0	3210A445	00000
								3/4"	1/2"	2 5/8"	Round	3013A85	00000	———	0	———	0
								3/4"	1/2"	2 3/4"	Round	———	0	———	0	3210A455	00000
								1"	1/2"	2 3/4"	Round	3013A86	00000	———	0	3210A465	00000

								6 Flutes





												120° Countersink Angle
												1/8"	1/8"	1 1/4"	Round	———	0	3098A641	000000	3210A616	00000
												3/16"	3/16"	1 3/8"	Round	———	0	3098A642	00000	3210A626	00000
												1/4"	1/4"	1 1/2"	Round	———	0	3098A643	00000	3210A636	00000
												5/16"	1/4"	1 3/4"	Round	———	0	3098A644	00000	3210A646	00000
												3/8"	1/4"	1 3/4"	Round	———	0	3098A645	00000	3210A656	00000
												1/2"	3/8"	2"	Round	———	0	3098A646	00000	3210A666	00000
												5/8"	3/8"	2 1/4"	Round	———	0	3098A647	00000	3210A676	00000
												3/4"	1/2"	2 5/8"	Round	———	0	3098A648	00000	3210A68	00000
												7/8"	1/2"	2 3/4"	Round	———	0	3098A649	00000	3210A696	00000
												1"	1/2"	2 3/4"	Round	———	0	3098A651	00000	3210A716	00000
												1 1/4"	1/2"	2 3/4"	Round	———	0	3098A652	00000	3210A726	00000
												1 1/2"	3/4"	2 7/8"	Round	———	0	3098A653	000000	3210A736	000000
												2"	3/4"	3 1/4"	Round	———	0	3098A654	000000	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		Each		Each		Each
1 Flute





				120° Countersink Angle
				1/8"	1/8"	1 1/2"	Round	3285A315	000000	———	0	3213A315	000000
				3/16"	3/16"	1 1/2"	Round	3285A325	00000	———	0	3213A325	00000
				1/4"	1/4"	2"	Round	3285A335	00000	———	0	3213A335	00000
				3/8"	1/4"	2"	Round	3285A345	00000	———	0	3213A345	00000
				1/2"	3/8"	2"	Round	3285A355	00000	———	0	3213A355	00000
				5/8"	3/8"	2 1/4"	Round	3285A365	00000	———	0	3213A365	00000
				3/4"	1/2"	2 3/4"	Round	3285A375	00000	———	0	3213A375	00000
				1"	1/2"	2 3/4"	Round	3285A385	00000	———	0	3213A385	00000
				1 1/4"	1/2"	3"	Round	3285A395	000000	———	0	3213A395	000000
				1 1/2"	3/4"	3 1/2"	Round	3285A415	000000	———	0	3213A415	000000
				1 3/4"	3/4"	4 1/4"	Round	———	0	———	0	3213A425	000000

				3 Flutes





								120° Countersink Angle
								1/4"	1/4"	2"	Round	3285A445	00000	———	0	3213A515	00000
								3/8"	1/4"	2"	Round	3285A455	00000	———	0	3213A525	00000
								1/2"	3/8"	2"	Round	3285A465	00000	———	0	3213A535	00000
								5/8"	3/8"	2 1/4"	Round	3285A475	00000	———	0	3213A545	00000
								3/4"	1/2"	2 3/4"	Round	3285A485	00000	———	0	3213A555	00000
								1"	1/2"	2 3/4"	Round	3285A495	00000	———	0	3213A565	00000

								6 Flutes





												120° Countersink Angle
												1/8"	1/8"	1 1/4"	Round	———	0	3285A616	000000	———	0
												1/8"	1/8"	1 1/2"	Round	———	0	———	0	3213A116	00000
												3/16"	3/16"	1 3/8"	Round	———	0	3285A626	00000	———	0
												3/16"	3/16"	1 1/2"	Round	———	0	———	0	3213A126	00000
												1/4"	1/4"	1 1/2"	Round	———	0	3285A636	00000	———	0
												1/4"	1/4"	2"	Round	———	0	———	0	3213A136	00000
												5/16"	1/4"	1 1/2"	Round	———	0	3285A646	00000	———	0
												5/16"	1/4"	2"	Round	———	0	———	0	3213A146	00000
												3/8"	1/4"	1 3/4"	Round	———	0	3285A656	00000	———	0
												3/8"	1/4"	2"	Round	———	0	———	0	3213A156	00000
												1/2"	3/8"	2"	Round	———	0	3285A666	00000	3213A166	00000
												5/8"	3/8"	2 1/4"	Round	———	0	3285A676	00000	3213A176	00000
												3/4"	1/2"	2 5/8"	Round	———	0	3285A686	00000	———	0
												3/4"	1/2"	2 3/4"	Round	———	0	———	0	3213A186	00000
												7/8"	1/2"	2 3/4"	Round	———	0	3285A696	00000	3213A196	00000
												1"	1/2"	2 3/4"	Round	———	0	3285A716	00000	3213A216	00000
												1 1/4"	1/2"	2 3/4"	Round	———	0	3285A726	000000	———	0
												1 1/2"	3/4"	2 7/8"	Round	———	0	3285A736	000000	3213A236	000000
												2"	3/4"	3 1/4"	Round	———	0	3285A746	000000	3213A246	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		Each
3 Flutes





				120° Countersink Angle
				1/4"	1/4"	1 1/4"	Round	2742A73	000000
				3/8"	1/4"	1 5/8"	Round	2742A74	00000
				1/2"	1/4"	2"	Round	2742A75	00000
				5/8"	1/4"	2 1/4"	Round	2742A76	00000
				3/4"	1/2"	3"	Round	2742A77	00000
				1"	1/2"	3 1/4"	Round	2742A79	00000
				1 1/4"	5/8"	3 1/2"	Round	2742A82	000000
				1 1/2"	3/4"	3 7/8"	Round	2742A83	000000
				2"	3/4"	4 1/4"	Round	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		Each
4 Flutes





				120° Countersink Angle
				1/8"	1/8"	0.041"	1 1/2"	Round	27535A77	000000
				3/16"	3/16"	0.062"	1 1/2"	Round	27535A78	00000
				1/4"	1/4"	0.082"	2"	Round	27535A79	00000
				5/16"	1/4"	0.104"	2"	Round	27535A81	00000
				3/8"	1/4"	0.125"	2"	Round	27535A82	00000
				1/2"	3/8"	0.167"	2"	Round	27535A83	00000
				5/8"	3/8"	0.208"	2 1/4"	Round	27535A84	00000
				3/4"	1/2"	0.250"	2 3/4"	Round	27535A85	00000
				7/8"	1/2"	0.291"	2 3/4"	Round	27535A86	00000
				1"	1/2"	0.333"	2 3/4"	Round	27535A87	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		Each
6 Flutes





				120° Countersink Angle
				1/8"	1/8"	1 1/2"	Round	27885A71	000000
				3/16"	3/16"	2"	Round	27885A72	00000
				1/4"	1/4"	2"	Round	27885A73	00000
				5/16"	5/16"	2 1/2"	Round	27885A74	00000
				3/8"	3/8"	2 1/2"	Round	27885A75	00000
				1/2"	1/2"	3"	Round	27885A76	00000
				5/8"	5/8"	3 1/2"	Round	27885A77	00000
				3/4"	3/4"	4"	Round	27885A78	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		Each
6 Flutes





				120° Countersink Angle
				1/8"	1/8"	1 1/2"	Round	27655A71	000000
				3/16"	3/16"	2"	Round	27655A72	00000
				1/4"	1/4"	2"	Round	27655A73	00000
				5/16"	5/16"	2 1/2"	Round	27655A74	00000
				3/8"	3/8"	2 1/2"	Round	27655A75	00000
				1/2"	1/2"	3"	Round	27655A76	000000
				5/8"	5/8"	3 1/2"	Round	27655A77	000000
				3/4"	3/4"	4"	Round	27655A78	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		Each
4 Flutes





				120° Countersink Angle
				1/8"	1/8"	0.041"	1 1/2"	Round	3290A516	000000
				3/16"	3/16"	0.062"	2"	Round	3290A526	00000
				1/4"	1/4"	0.082"	2"	Round	3290A536	00000
				5/16"	5/16"	0.104"	2 1/2"	Round	3290A546	00000
				3/8"	3/8"	0.125"	2 1/2"	Round	3290A556	00000
				1/2"	1/2"	0.167"	3"	Round	3290A566	000000
				3/4"	3/4"	0.250"	4"	Round	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.

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		Each
High-Speed Steel


		3	1/4", 3/8", 1/2", 3/4", 1"	5	Uncoated	Round	Plastic Case	3012A16	0000000
		6	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1"	7	Black Oxide	Round	Plastic Case	3098A66	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.

							120° Countersink Angle
	No. of Flutes	Body Dia. Included	No. of Pieces	Finish	Shank Type	Container Type		Each
High-Speed Steel


		3	1/4", 3/8", 1/2", 5/8", 3/4"	5	Uncoated	Round	Plastic Case	2742A616	0000000