Long-Reach Countersinks | McMaster-Carr

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For Screw System of Measurement

27 Products

About Countersinks

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

Long-Reach Countersinks for Screws

At around twice the length of our standard countersinks, these give you access to hard-to-reach holes. They're more prone to wobbling than shorter countersinks, so consider using a drill press or other rigid tool setup.

High-Speed Steel

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.

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
	Body	Shank	Overall Lg.	Shank Type	Mfr.		Each
1 Flute







				82° Countersink Angle

				1/8"	1/8"	4"	Round	Melin Tool	3172A11	000000


				3/16"	3/16"	4"	Round	Melin Tool	3172A12	00000
				1/4"	1/4"	6"	Round	Melin Tool	3172A13	00000
				5/16"	5/16"	6"	Round	Melin Tool	3172A14	00000
				3/8"	3/8"	6"	Round	Melin Tool	3172A15	00000
				1/2"	3/8"	6"	Round	Melin Tool	3172A16	00000
				5/8"	3/8"	6"	Round	Melin Tool	3172A17	00000
				3/4"	1/2"	6"	Round	Melin Tool	3172A18	00000
				1"	1/2"	6"	Round	Melin Tool	3172A19	000000


				6 Flutes







								82° Countersink Angle

								1/8"	1/8"	4"	Round	Melin Tool	3195A21	00000


								3/16"	3/16"	4"	Round	Melin Tool	3195A22	00000
								1/4"	1/4"	6"	Round	Melin Tool	3195A23	00000
								5/16"	5/16"	6"	Round	Melin Tool	3195A24	00000
								3/8"	3/8"	6"	Round	Melin Tool	3195A25	00000
								1/2"	3/8"	6"	Round	Melin Tool	3195A26	00000
								5/8"	3/8"	6"	Round	Melin Tool	3195A27	00000
								3/4"	1/2"	6"	Round	Melin Tool	3195A28	00000
								1"	1/2"	6"	Round	Melin Tool	3195A29	000000

Two-Piece Long-Reach Countersinks for Screws

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	Extensions

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

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







				82° Countersink Angle

				3/8"	1/4"	3/4"	Threaded	Craig Tools	3109A21	000000	3109A71	000000	3109A72	000000	3109A73	000000


				1/2"	1/4"	3/4"	Threaded	Craig Tools	3109A22	00000	3109A71	00000	3109A72	00000	3109A73	00000




						90° Countersink Angle

						3/8"	1/4"	3/4"	Threaded	Craig Tools	3109A31	00000	3109A71	00000	3109A72	00000	3109A73	00000


						1/2"	1/4"	3/4"	Threaded	Craig Tools	3109A32	00000	———	0	———	0	———	0

Long-Reach Extensions for Threaded-Shank Countersinks

Increase the reach of long-reach threaded-shank countersinks (sold separately). These extensions are compatible with 82°, 90°, and 100° angle threaded-shank countersinks.

	Body Dia.	For Shaft Thread Size	Shank Dia.	For Use On		Each
Uncoated Carbon Steel



	4"	3/8"	1/4"-28	1/4"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3109A71	000000


	6"	3/8"	1/4"-28	1/4"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3109A72	00000
	12"	3/8"	1/4"-28	1/4"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3109A73	00000

Two-Piece Long-Reach Countersinks for Rivets

High-Speed Steel


2 Flutes	Extensions

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

	Countersinks							4" Overall Length Countersink and Counterbore Extensions		6" Overall Length Countersink and Counterbore Extensions		12" Overall Length Countersink and Counterbore 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