Zero-Flute Countersinks | McMaster-Carr

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EAR99

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53 Products

About Countersinks

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

For Cutting

Screw Holes

Widen the openings of holes so flat-head screws sit flush with the surface

35 products

Rivet Holes

Widen the openings of holes so rivets sit flush with the surface

6 products

For Cutting

Lathe Center Holes

Cut a profiled recess to keep your workpiece aligned as it spins

12 products

Material

High-Speed Steel

Make accurate cuts in most materials without chipping or cracking

38 products

Fluteless Smooth-Finish Countersinks for Screws

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

0 Flutes

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		Each
0 Flutes







				82° Countersink Angle

				5/32" to 13/32"	7/16"	1/4"	1 21/32"	Round	0000000	000000


				3/16" to 17/32"	9/16"	1/4"	1 7/8"	Round	0000000	00000
				5/16" to 25/32"	13/16"	1/4"	2 1/8"	Round	0000000	00000
				5/16" to 25/32"	13/16"	1/2"	2 5/8"	Round	0000000	00000
				7/16" to 7/8"	15/16"	1/2"	2 19/32"	Round	0000000	00000
				9/16" to 1 1/16"	1 1/8"	1/2"	2 29/32"	Round	0000000	00000
				5/8" to 1 15/32"	1 1/2"	1/2"	2 7/8"	Round	0000000	000000
				3/4" to 1 3/4"	1 3/4"	5/8"	3 1/8"	Round	0000000	000000
				1" to 2"	2 1/8"	5/8"	3 1/2"	Round	0000000	000000
				1 1/4" to 2 1/2"	2 5/8"	3/4"	3 7/8"	Round	0000000	000000




						90° Countersink Angle

						5/32" to 13/32"	7/16"	1/4"	1 21/32"	Round	0000000	00000


						3/16" to 17/32"	9/16"	1/4"	1 7/8"	Round	0000000	00000
						5/16" to 25/32"	13/16"	1/4"	2 1/8"	Round	0000000	00000
						5/16" to 25/32"	13/16"	1/2"	2 5/8"	Round	0000000	00000
						9/16" to 1 1/16"	1 1/8"	1/2"	2 29/32"	Round	0000000	00000

Cobalt Steel

0 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.

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







				82° Countersink Angle

				13/64" to 27/64"	7/16"	1/4"	2 1/32"	Round	00000000	000000


				5/16" to 17/32"	9/16"	1/4"	2"	Round	00000000	00000
				1/2" to 25/32"	13/16"	1/2"	2 5/8"	Round	00000000	00000
				3/4" to 1 3/32"	1 1/8"	1/2"	2 7/8"	Round	00000000	00000




						90° Countersink Angle

						13/64" to 27/64"	7/16"	1/4"	2 1/32"	Round	00000000	00000


						5/16" to 17/32"	9/16"	1/4"	2"	Round	00000000	00000
						1/2" to 25/32"	13/16"	1/2"	2 5/8"	Round	00000000	00000
						3/4" to 1 3/32"	1 1/8"	1/2"	2 7/8"	Round	00000000	00000

Fluteless Smooth-Finish Countersinks with Pilot for Screws

Cut a smooth, accurate seat for your screw head on the first pass. The built-in pilot centers the countersink while the hollow body prevents chip buildup, vibration, and wobbling.

High-Speed Steel

0 Flutes

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

		Dia.		Pilot					Uncoated
	For Hole Dia.	Body	Shank	Dia.	Lg.	For Screw Size	Overall Lg.	Shank Type		Each
0 Flutes







				82° Countersink Angle

				1/4" to 33/64"	33/64"	3/8"	1/4"	5/32"	1/4"	2"	Round	0000000	000000


				5/16" to 41/64"	41/64"	3/8"	5/16"	5/32"	5/16"	2 3/16"	Round	0000000	00000
				3/8" to 49/64"	49/64"	1/2"	3/8"	5/32"	3/8"	2 1/2"	Round	0000000	00000
				7/16" to 53/64"	53/64"	1/2"	7/16"	7/32"	7/16"	2 11/16"	Round	0000000	00000
				1/2" to 15/16"	15/16"	1/2"	1/2"	1/4"	1/2"	2 11/16"	Round	0000000	00000

Fluteless Smooth-Finish Countersink Sets for Screws

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

			For Hole Dia.					82° Countersink Angle		90° Countersink Angle
	No. of Flutes	No. of Pieces	1/4" Shank	1/2" Shank	Finish	Shank Type	Container Type		Each		Each
High-Speed Steel



		0	5	1/16", 5/32", 3/16"	5/16", 9/16"	Uncoated	Round	Wood Stand	0000000	0000000	0000000	0000000

Fluteless Smooth-Finish Countersink Sets with Pilot for Screws

Cut a smooth, accurate seat for your screw head on the first pass. The built-in pilot centers the countersink while the hollow body prevents chip buildup, vibration, and wobbling.

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

							82° Countersink Angle
	No. of Flutes	No. of Pieces	For Hole Dia.	Finish	Shank Type	Container Type		Each
High-Speed Steel



		0	5	1/4" to 15/16"	Uncoated	Round	Wood Stand	0000000	0000000

Fluteless Smooth-Finish Countersinks for Rivets

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		Each
0 Flutes







				100° Countersink Angle

				5/32" to 13/32"	7/16"	1/4"	1 21/32"	Round	0000000	000000


				3/16" to 17/32"	9/16"	1/4"	1 7/8"	Round	0000000	00000
				5/16" to 25/32"	13/16"	1/2"	2 5/8"	Round	0000000	00000
				9/16" to 1 1/16"	1 1/8"	1/2"	2 29/32"	Round	0000000	00000

Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Screws

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

0 Flutes

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		Each
0 Flutes







				82° Countersink Angle

				1/16" to 15/64"	1/4"	1/4"	1 7/8"	Round	0000000	000000




						90° Countersink Angle

						1/16" to 15/64"	1/4"	1/4"	1 7/8"	Round	0000000	00000

Cobalt Steel

0 Flutes

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







				82° Countersink Angle

				3/32" to 15/64"	1/4"	1/4"	1 1/2"	Round	00000000	000000




						90° Countersink Angle

						3/32" to 15/64"	1/4"	1/4"	1 1/2"	Round	00000000	00000

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		Each
High-Speed Steel



		0	5	1/16", 5/32", 3/16"	5/16", 9/16"	Uncoated	Round	Wood Stand	0000000	0000000

Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Rivets

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		Each
0 Flutes







				100° Countersink Angle

				1/16" to 15/64"	1/4"	1/4"	1 7/8"	Round	0000000	000000

Fluteless Smooth-Finish Countersinks for Lathe Centers

High-Speed Steel

0 Flutes

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		Each
0 Flutes







				60° Countersink Angle

				3/16" to 13/32"	7/16"	1/4"	1 25/32"	Round	0000000	000000


				5/16" to 17/32"	9/16"	1/4"	1 15/16"	Round	0000000	00000
				7/16" to 25/32"	13/16"	1/4"	2 3/8"	Round	0000000	00000
				7/16" to 25/32"	13/16"	1/2"	2 3/4"	Round	0000000	00000
				11/16" to 1 3/32"	1 1/8"	1/2"	2 11/64"	Round	0000000	00000

Cobalt Steel

0 Flutes

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







				60° Countersink Angle

				13/64" to 27/64"	7/16"	1/4"	2 1/32"	Round	00000000	000000


				5/16" to 17/32"	9/16"	1/4"	2"	Round	00000000	00000
				1/2" to 25/32"	13/16"	1/2"	2 5/8"	Round	00000000	00000
				3/4" to 1 3/32"	1 1/8"	1/2"	2 7/8"	Round	00000000	00000

Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Lathe Centers

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		Each
0 Flutes







				60° Countersink Angle

				1/8" to 15/64"	1/4"	1/4"	1 7/8"	Round	0000000	000000

Cobalt Steel

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







				60° Countersink Angle

				3/32" to 15/64"	1/4"	1/4"	1 1/2"	Round	00000000	000000

Fluteless Smooth-Finish Countersink Sets for Lathe Centers

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

			For Hole Dia.					60° Countersink Angle
	No. of Flutes	No. of Pieces	1/4" Shank	1/2" Shank	Finish	Shank Type	Container Type		Each
High-Speed Steel



		0	5	1/8", 3/16", 5/16"	7/16", 11/16"	Uncoated	Round	Wood Stand	0000000	0000000