Metric Countersinks | McMaster-Carr

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7 Products

About Countersinks

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

Drill-Point Countersinks for Screws

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 screw heads.

High-Speed Steel

2 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.

	Dia., mm						Uncoated
	Body	Shank	Drill Tip Dia., mm	For Screw Size	Overall Lg., mm	Shank Type		Each
2 Flutes







				90° Countersink Angle

				6.35	6.35	3.10	M3	44.44	Round	00000000	000000


				8.20	6.35	4.10	M4	44.44	Round	00000000	00000
				11.10	7.93	5.10	M5	50.79	Round	00000000	00000
				12.70	7.93	6.10	M6	50.79	Round	00000000	00000
				17.45	11.11	8.10	M8	66.66	Round	00000000	00000
				20.63	12.7	10.10	M10	76.19	Round	00000000	00000
				25.40	15.87	12.10	M12	76.19	Round	00000000	00000