Drill-Bit Countersinks | McMaster-Carr

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Make It Snappy Tools

W. L. Fuller

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Straight

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EAR99

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REACH

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98 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

65 products

Sold As

Set

Cut cone-shaped recesses for a range of fastener or lathe-center diameters

4 products

Shank Type

Quick-Change Hex

Save time when you need to change countersinks frequently

11 products

Drill-Bit Countersinks for Wood and Plastic

These countersinks attach at various points along the drill bit, so one tool will drill countersunk holes for screws of different lengths. They're designed to cut a smooth and even finish in wood and plastic on the first pass.

High-Speed Steel


4 Flutes	Depth Stops

These wear-resistant countersinks cut faster and last longer than carbon steel countersinks, so they’re often used for high-volume jobs. You can also use them on harder materials, such as steel and stainless steel.

	Countersinks							Depth Stops		Drill Bits
					Uncoated
	Body Dia.	For Drill Bit Size	For Screw Size	Overall Lg.	Mfr.		Each		Each		Each
4 Flutes







				82° Countersink Angle

				1/4"	3/32"	No. 3	3/4"	W. L. Fuller	2910A11	000000	2903A11	00000	8870A16	00000


				5/16"	7/64"	No. 4	3/4"	W. L. Fuller	2910A12	00000	2903A12	0000	8870A17	0000
				3/8"	1/8"	No. 5	7/8"	W. L. Fuller	2910A13	00000	2903A13	0000	8870A18	0000
				3/8"	9/64"	No. 6	7/8"	W. L. Fuller	2910A14	00000	2903A13	0000	8870A19	0000
				3/8"	5/32"	No. 7	7/8"	W. L. Fuller	2910A15	00000	2903A13	0000	8870A21	0000
				3/8"	11/64"	No. 8	7/8"	W. L. Fuller	2910A16	00000	2903A13	0000	8870A22	0000
				3/8"	3/16"	No. 9	7/8"	W. L. Fuller	2910A17	00000	2903A13	0000	8870A23	0000
				3/8"	13/64"	No. 10	7/8"	W. L. Fuller	2910A29	00000	2903A13	0000	8870A24	0000
				3/8"	7/32"	No. 12	7/8"	W. L. Fuller	2910A31	00000	2903A13	0000	8870A25	0000
				7/16"	13/64"	No. 10	7/8"	W. L. Fuller	2910A18	00000	2903A14	0000	8870A24	0000
				1/2"	5/32"	No. 7	7/8"	W. L. Fuller	2910A32	00000	2903A15	0000	8870A21	0000


				1/2"	3/16"	No. 9	7/8"	W. L. Fuller	2910A27	00000	2903A15	0000	8870A23	0000
				1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2910A19	00000	2903A15	0000	8870A24	0000
				1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2910A21	00000	2903A15	0000	8870A25	0000
				1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2910A22	00000	2903A15	0000	8870A27	0000
				5/8"	3/16"	No. 9	1 1/16"	W. L. Fuller	2910A23	00000	2903A17	0000	8870A23	0000
				5/8"	1/4"	No. 16	1 1/16"	W. L. Fuller	2910A24	00000	2903A17	0000	8870A27	0000
				5/8"	9/32"	No. 16	1 1/16"	W. L. Fuller	2910A25	00000	2903A17	0000	8870A29	0000
				5/8"	5/16"	No. 18	1 1/16"	W. L. Fuller	2910A26	00000	2903A17	0000	8870A32	0000




						90° Countersink Angle

						1/4"	3/32"	No. 3	3/4"	W. L. Fuller	2910A71	00000	2903A11	0000	8870A16	0000


						5/16"	7/64"	No. 4	3/4"	W. L. Fuller	2910A72	00000	2903A12	0000	8870A17	0000
						3/8"	1/8"	No. 5	7/8"	W. L. Fuller	2910A73	00000	2903A13	0000	8870A18	0000
						3/8"	9/64"	No. 6	7/8"	W. L. Fuller	2910A74	00000	2903A13	0000	8870A19	0000
						3/8"	5/32"	No. 7	7/8"	W. L. Fuller	2910A75	00000	2903A13	0000	8870A21	0000
						3/8"	11/64"	No. 8	7/8"	W. L. Fuller	2910A76	00000	2903A13	0000	8870A22	0000
						3/8"	3/16"	No. 9	7/8"	W. L. Fuller	2910A77	00000	2903A13	0000	8870A23	0000
						3/8"	13/64"	No. 10	7/8"	W. L. Fuller	2910A89	00000	2903A13	0000	8870A24	0000
						3/8"	7/32"	No. 12	7/8"	W. L. Fuller	2910A91	00000	2903A13	0000	8870A25	0000
						7/16"	13/64"	No. 10	7/8"	W. L. Fuller	2910A78	00000	2903A14	0000	8870A24	0000
						1/2"	5/32"	No. 7	7/8"	W. L. Fuller	2910A92	00000	2903A15	0000	8870A21	0000


						1/2"	3/16"	No. 9	7/8"	W. L. Fuller	2910A87	00000	2903A15	0000	8870A23	0000
						1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2910A79	00000	2903A15	0000	8870A24	0000
						1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2910A81	00000	2903A15	0000	8870A25	0000
						1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2910A82	00000	2903A15	0000	8870A27	0000
						5/8"	3/16"	No. 9	1 1/16"	W. L. Fuller	2910A83	00000	2903A17	0000	8870A23	0000
						5/8"	1/4"	No. 16	1 1/16"	W. L. Fuller	2910A84	00000	2903A17	0000	8870A27	0000
						5/8"	9/32"	No. 16	1 1/16"	W. L. Fuller	2910A85	00000	2903A17	0000	8870A29	0000
						5/8"	5/16"	No. 18	1 1/16"	W. L. Fuller	2910A86	00000	2903A17	0000	8870A32	0000

Carbon Steel


4 Flutes	Depth Stops

Stronger than high-speed steel, so it will cut through harder materials. However, high-speed steel is more precise, lasts longer, and cuts at higher speeds.

	Countersinks							Depth Stops		Drill Bits
					Uncoated
	Body Dia.	For Drill Bit Size	For Screw Size	Overall Lg.	Mfr.		Each		Each		Each
4 Flutes







				82° Countersink Angle

				1/4"	3/32"	No. 3	3/4"	W. L. Fuller	2785A12	000000	2903A11	00000	3080A36	00000


				5/16"	7/64"	No. 4	7/8"	W. L. Fuller	2785A13	00000	2903A12	0000	3080A37	0000
				3/8"	1/8"	No. 5	7/8"	W. L. Fuller	2785A21	00000	2903A13	0000	3080A14	0000
				3/8"	9/64"	No. 6	7/8"	W. L. Fuller	2785A22	00000	2903A13	0000	3080A16	0000
				3/8"	5/32"	No. 7	7/8"	W. L. Fuller	2785A23	00000	2903A13	0000	3080A17	0000
				3/8"	11/64"	No. 8	7/8"	W. L. Fuller	2785A24	00000	2903A13	0000	3080A18	0000
				3/8"	3/16"	No. 9	7/8"	W. L. Fuller	2785A25	00000	2903A13	0000	3080A19	0000
				3/8"	13/64"	No. 10	7/8"	W. L. Fuller	2785A26	00000	2903A13	0000	3080A22	0000
				3/8"	7/32"	No. 12	7/8"	W. L. Fuller	2785A27	00000	2903A13	0000	3080A23	00000
				7/16"	13/64"	No. 10	7/8"	W. L. Fuller	2785A31	00000	2903A14	0000	3080A22	0000
				1/2"	5/32"	No. 7	7/8"	W. L. Fuller	2785A35	00000	2903A15	0000	3080A17	0000


				1/2"	3/16"	No. 9	7/8"	W. L. Fuller	2785A37	00000	2903A15	0000	3080A19	0000
				1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2785A38	00000	2903A15	0000	3080A22	0000
				1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2785A39	00000	2903A15	0000	3080A23	00000
				1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2785A52	00000	2903A15	0000	3080A25	00000
				5/8"	3/16"	No. 9	1 1/16"	W. L. Fuller	2785A53	00000	2903A17	0000	3080A19	0000
				5/8"	1/4"	No. 16	1 1/16"	W. L. Fuller	2785A54	00000	2903A17	0000	3080A25	00000
				5/8"	9/32"	No. 16	1 1/16"	W. L. Fuller	2785A56	00000	2903A17	0000	3080A32	00000
				5/8"	5/16"	No. 18	1 1/16"	W. L. Fuller	2785A58	00000	2903A17	0000	3080A34	00000

Quick-Change Hex Drill-Bit Countersinks for Wood and Plastic

Switch bits instead of tools to simplify jobs. These snap directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank. You can slide the countersink up and down the drill bit and then secure it with a set screw, so one tool will drill countersunk holes for screws of different lengths. These countersinks cut a smooth and even finish in wood and plastic on the first pass.

High-Speed Steel


2 Flutes	Depth Stops

	Countersinks										Depth Stops		Drill Bits
			For Screw Size					Uncoated
	Body Dia.	Max. Hole Drilling Dp.	Hard Wood	Soft Wood	Overall Lg.	Shank Size	Shank Type	Mfr.		Each		Each		Each
2 Flutes







				82° Countersink Angle

				1/2"	1"	—	No. 6	2 11/16"	1/4"	Quick-Change Hex	Make It Snappy Tools	2747A22	00000	3438N11	000000	8870A16	00000


				1/2"	1"	No. 4	—	2 9/16"	1/4"	Quick-Change Hex	Make It Snappy Tools	2747A21	0000	3438N11	00000	8870A15	0000
				1/2"	1"	No. 6	No. 8	2 27/32"	1/4"	Quick-Change Hex	Make It Snappy Tools	2747A23	0000	3438N11	00000	8870A17	0000
				1/2"	1"	No. 8	No. 10	2 31/32"	1/4"	Quick-Change Hex	Make It Snappy Tools	2747A24	0000	3438N11	00000	8870A18	0000
				1/2"	1"	No. 10	No. 12	3 3/32"	1/4"	Quick-Change Hex	Make It Snappy Tools	2747A25	0000	3438N11	00000	8870A19	0000

Drill-Bit Countersink Sets for Wood and Plastic

Image of Product. Front orientation. Countersinks. Sold as Sets, For Wood, Drill-Bit Countersink, Straight Flute, For Cutting Screw Holes, 1 Countersinking End.

High-Speed Steel—These wear-resistant countersinks cut faster and last longer than carbon steel countersinks, so they’re often used for high-volume jobs. You can also use them on harder materials, such as steel and stainless steel.

Carbon Steel—Stronger than high-speed steel, so it will cut through harder materials. However, high-speed steel is more precise, lasts longer, and cuts at higher speeds.

						82° Countersink Angle
	No. of Flutes	For Drill Bit Size (Body Dia.)	No. of Pieces	Finish	Container Type	Mfr.		Each
High-Speed Steel



		4	1/8" (3/8"), 9/64" (3/8"), 5/32" (3/8"), 11/64" (3/8"), 3/16" (3/8"), 13/64" (7/16"), 7/32" (1/2")	7	Uncoated	Wood Stand	W. L. Fuller	2910A41	0000000


		4	1/8" (3/8"), 9/64" (3/8"), 5/32" (3/8"), 11/64" (3/8"), 3/16" (3/8"), 13/64" (7/16"), 3/16" (1/2"), 13/64" (1/2"), 7/32" (1/2"), 1/4" (1/2"), 3/16" (5/8"), 1/4" (5/8"), 9/32" (5/8"), 5/16" (5/8")	14	Uncoated	Wood Stand	W. L. Fuller	2910A45	000000


		Carbon Steel



				4	1/8" (3/8"), 9/64" (3/8"), 5/32" (3/8"), 11/64" (3/8"), 3/16" (3/8"), 13/64" (7/16"), 7/32" (1/2")	7	Uncoated	Wood Stand	W. L. Fuller	2785A46	00000


				4	1/8" (3/8"), 9/64" (3/8"), 5/32" (3/8"), 11/64" (3/8"), 3/16" (3/8"), 13/64" (7/16"), 3/16" (1/2"), 13/64" (1/2"), 7/32" (1/2"), 1/4" (1/2"), 3/16" (5/8"), 1/4" (5/8"), 9/32" (5/8"), 5/16" (5/8")	14	Uncoated	Wood Stand	W. L. Fuller	2785A48	000000