Drill Bit Pilots | McMaster-Carr

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Aluminum Titanium Nitride (AlTiN) Coated

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Carbon Nitride (TiCN) Coated

Titanium Nitride (TiN) Coated

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365 Products

Center Drills

Create precisely centered holes that mate with lathe centers or drill and countersink in a single step to install fasteners.

High-Speed Steel

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

60° Countersink Angle—The most common center drill angle. The short and sturdy tip starts holes that perfectly match lathe centers.

82° Countersink Angle—Start a hole with cone-shaped recesses so inch screws sit flush with the surface.

90° Countersink Angle—Start a hole with cone-shaped recesses so metric screws sit flush with the surface.

Uncoated—Suitable for most tasks, but won't last as long as coated center drills.

			Dia.						Uncoated
	Trade Size	Drill Bit Size	Body	Shank	Overall Lg.	No. of Flutes	No. of Countersinking Ends	Mfr.		Each
60° Countersink Angle



		1	3/64"	1/8"	1/8"	3"	2	2	Keo	2915A31	000000


		1	3/64"	1/8"	1/8"	4"	2	2	Keo	2915A32	00000
		1	3/64"	1/8"	1/8"	5"	2	2	Keo	2915A325	00000
		1	3/64"	1/8"	1/8"	6"	2	2	Keo	2915A33	00000
		2	5/64"	3/16"	3/16"	3"	2	2	Keo	2915A331	00000
		2	5/64"	3/16"	3/16"	4"	2	2	Keo	2915A34	00000
		2	5/64"	3/16"	3/16"	5"	2	2	Keo	2915A35	00000
		2	5/64"	3/16"	3/16"	6"	2	2	Keo	2915A36	00000
		3	7/64"	1/4"	1/4"	3"	2	2	Keo	2915A361	00000
		3	7/64"	1/4"	1/4"	4"	2	2	Keo	2915A37	00000
		3	7/64"	1/4"	1/4"	5"	2	2	Keo	2915A38	00000


		3	7/64"	1/4"	1/4"	6"	2	2	Keo	2915A39	00000
		4	1/8"	5/16"	5/16"	3"	2	2	Keo	2915A391	00000
		4	1/8"	5/16"	5/16"	4"	2	2	Keo	2915A41	00000
		4	1/8"	5/16"	5/16"	5"	2	2	Keo	2915A42	00000
		4	1/8"	5/16"	5/16"	6"	2	2	Keo	2915A43	00000
		4 1/2	9/64"	3/8"	3/8"	4"	2	2	Keo	2915A86	00000
		4 1/2	9/64"	3/8"	3/8"	5"	2	2	Keo	2915A44	00000
		4 1/2	9/64"	3/8"	3/8"	6"	2	2	Keo	2915A87	00000
		5	3/16"	7/16"	7/16"	4"	2	2	Keo	2915A88	00000
		5	3/16"	7/16"	7/16"	5"	2	2	Keo	2915A45	00000


		5	3/16"	7/16"	7/16"	6"	2	2	Keo	2915A46	00000
		6	7/32"	1/2"	1/2"	4"	2	2	Keo	2915A461	00000
		6	7/32"	1/2"	1/2"	5"	2	2	Keo	2915A91	00000
		6	7/32"	1/2"	1/2"	6"	2	2	Keo	2915A47	00000
		7	1/4"	5/8"	5/8"	6"	2	2	Keo	2915A48	00000
		8	5/16"	3/4"	3/4"	6"	2	2	Keo	2915A49	00000


		82° Countersink Angle



				00	0.025"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A142	00000


				0	1/32"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A137	00000
				1	3/64"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A191	00000
				1	3/64"	1/8"	1/8"	3"	2	2	Keo	2756A11	00000
				1	3/64"	1/8"	1/8"	4"	2	2	Keo	2756A12	00000
				1	3/64"	1/8"	1/8"	5"	2	2	Keo	2756A13	00000
				1	3/64"	1/8"	1/8"	6"	2	2	Keo	2756A14	00000
				2	5/64"	3/16"	3/16"	1 7/8"	2	2	Keo	2915A192	00000
				2	5/64"	3/16"	3/16"	3"	2	2	Keo	2756A15	00000
				2	5/64"	3/16"	3/16"	4"	2	2	Keo	2756A16	00000
				2	5/64"	3/16"	3/16"	5"	2	2	Keo	2756A17	00000


				2	5/64"	3/16"	3/16"	6"	2	2	Keo	2756A18	00000
				3	7/64"	1/4"	1/4"	2"	2	2	Keo	2915A193	00000
				3	7/64"	1/4"	1/4"	3"	2	2	Keo	2756A19	00000
				3	7/64"	1/4"	1/4"	4"	2	2	Keo	2756A21	00000
				3	7/64"	1/4"	1/4"	5"	2	2	Keo	2756A22	00000
				3	7/64"	1/4"	1/4"	6"	2	2	Keo	2756A23	00000
				4	1/8"	5/16"	5/16"	2 1/8"	2	2	Keo	2915A194	00000
4				1/8"	5/16"	5/16"	3"	2	2	Keo	2756A24	00000
4	1/8"			5/16"	5/16"	4"	2	2	Keo	2756A25	00000
4	1/8"			5/16"	5/16"	5"	2	2	Keo	2756A26	00000


4	1/8"			5/16"	5/16"	6"	2	2	Keo	2756A27	00000
4 1/2	9/64"			3/8"	3/8"	2 1/2"	2	2	Keo	2915A156	00000
4 1/2	9/64"			3/8"	3/8"	4"	2	2	Keo	2756A28	00000
4 1/2	9/64"			3/8"	3/8"	5"	2	2	Keo	2756A29	00000
4 1/2	9/64"			3/8"	3/8"	6"	2	2	Keo	2756A31	00000
5	3/16"			7/16"	7/16"	2 3/4"	2	2	Keo	2915A195	00000
5	3/16"			7/16"	7/16"	4"	2	2	Keo	2756A32	00000
5	3/16"			7/16"	7/16"	5"	2	2	Keo	2756A33	00000
5	3/16"			7/16"	7/16"	6"	2	2	Keo	2756A34	00000
6	7/32"			1/2"	1/2"	3"	2	2	Keo	2915A196	00000


6	7/32"			1/2"	1/2"	4"	2	2	Keo	2756A35	00000
6	7/32"			1/2"	1/2"	5"	2	2	Keo	2756A36	00000
6	7/32"			1/2"	1/2"	6"	2	2	Keo	2756A37	00000
7	1/4"			5/8"	5/8"	3 1/4"	2	2	Keo	2915A197	00000
7	1/4"			5/8"	5/8"	6"	2	2	Keo	2756A38	000000
8	5/16"			3/4"	3/4"	3 1/2"	2	2	Keo	2915A198	00000
8	5/16"			3/4"	3/4"	6"	2	2	Keo	2756A39	000000
9	11/32"			7/8"	7/8"	3 5/8"	2	2	Keo	2915A162	000000
10	3/8"			1"	1"	3 3/4"	2	2	Keo	2915A165	000000


90° Countersink Angle



				00000	0.010"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A132	00000


				0000	0.015"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A133	00000
				000	0.020"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A134	00000
				00	0.025"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A143	00000
				0	1/32"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A138	00000
				1	3/64"	1/8"	1/8"	1 1/4"	2	2	Keo	2915A21	00000
		1		3/64"	1/8"	1/8"	3"	2	2	Keo	2756A41	00000
		1	3/64"	1/8"	1/8"	4"	2	2	Keo	2756A42	00000
		1	3/64"	1/8"	1/8"	5"	2	2	Keo	2756A43	00000
		1	3/64"	1/8"	1/8"	6"	2	2	Keo	2756A44	00000
		2	5/64"	3/16"	3/16"	1 7/8"	2	2	Keo	2915A22	00000


		2	5/64"	3/16"	3/16"	3"	2	2	Keo	2756A45	00000
		2	5/64"	3/16"	3/16"	4"	2	2	Keo	2756A46	00000
		2	5/64"	3/16"	3/16"	5"	2	2	Keo	2756A47	00000
		2	5/64"	3/16"	3/16"	6"	2	2	Keo	2756A48	00000
		3	7/64"	1/4"	1/4"	2"	2	2	Keo	2915A23	00000
		3	7/64"	1/4"	1/4"	3"	2	2	Keo	2756A49	00000
		3	7/64"	1/4"	1/4"	4"	2	2	Keo	2756A51	00000
		3	7/64"	1/4"	1/4"	5"	2	2	Keo	2756A52	00000
		3	7/64"	1/4"	1/4"	6"	2	2	Keo	2756A53	00000
		4	1/8"	5/16"	5/16"	2 1/8"	2	2	Keo	2915A24	00000


		4	1/8"	5/16"	5/16"	3"	2	2	Keo	2756A54	00000
		4	1/8"	5/16"	5/16"	4"	2	2	Keo	2756A55	00000
		4	1/8"	5/16"	5/16"	5"	2	2	Keo	2756A56	00000
		4	1/8"	5/16"	5/16"	6"	2	2	Keo	2756A57	00000
		4 1/2	9/64"	3/8"	3/8"	2 1/2"	2	2	Keo	2915A25	00000
		4 1/2	9/64"	3/8"	3/8"	4"	2	2	Keo	2756A58	00000
		4 1/2	9/64"	3/8"	3/8"	5"	2	2	Keo	2756A59	00000
		4 1/2	9/64"	3/8"	3/8"	6"	2	2	Keo	2756A61	00000
		5	3/16"	7/16"	7/16"	2 3/4"	2	2	Keo	2915A26	00000
		5	3/16"	7/16"	7/16"	4"	2	2	Keo	2756A62	00000


		5	3/16"	7/16"	7/16"	5"	2	2	Keo	2756A63	00000
		5	3/16"	7/16"	7/16"	6"	2	2	Keo	2756A64	00000
		6	7/32"	1/2"	1/2"	3"	2	2	Keo	2915A27	00000
		6	7/32"	1/2"	1/2"	4"	2	2	Keo	2756A65	00000
		6	7/32"	1/2"	1/2"	5"	2	2	Keo	2756A66	00000
		6	7/32"	1/2"	1/2"	6"	2	2	Keo	2756A67	00000
		7	1/4"	5/8"	5/8"	3 1/4"	2	2	Keo	2915A28	00000
		7	1/4"	5/8"	5/8"	6"	2	2	Keo	2756A68	000000
		8	5/16"	3/4"	3/4"	3 1/2"	2	2	Keo	2915A29	00000
		8	5/16"	3/4"	3/4"	6"	2	2	Keo	2756A69	000000


		9	11/32"	7/8"	7/8"	3 5/8"	2	2	Keo	2915A163	000000
		10	3/8"	1"	1"	3 3/4"	2	2	Keo	2915A166	000000

Cobalt Steel

Tough and wear resistant, these center drills 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.

60° Countersink Angle—The most common center drill angle. The short and sturdy tip starts holes that perfectly match lathe centers.

Uncoated—Suitable for most tasks, but won't last as long as coated center drills.

			Dia.						Uncoated
	Trade Size	Drill Bit Size	Body	Shank	Overall Lg.	No. of Flutes	No. of Countersinking Ends	Mfr.		Each
60° Countersink Angle



		1	3/64"	1/8"	1/8"	3"	2	2	Keo	2728A11	000000


		1	3/64"	1/8"	1/8"	4"	2	2	Keo	2728A12	00000
		1	3/64"	1/8"	1/8"	5"	2	2	Keo	2728A13	00000
		1	3/64"	1/8"	1/8"	6"	2	2	Keo	2728A14	00000
		2	5/64"	3/16"	3/16"	3"	2	2	Keo	2728A15	00000
		2	5/64"	3/16"	3/16"	4"	2	2	Keo	2728A16	00000
		2	5/64"	3/16"	3/16"	5"	2	2	Keo	2728A17	00000
		2	5/64"	3/16"	3/16"	6"	2	2	Keo	2728A18	00000
		3	7/64"	1/4"	1/4"	3"	2	2	Keo	2728A19	00000
		3	7/64"	1/4"	1/4"	4"	2	2	Keo	2728A21	00000
		3	7/64"	1/4"	1/4"	5"	2	2	Keo	2728A22	00000


		3	7/64"	1/4"	1/4"	6"	2	2	Keo	2728A23	00000
		4	1/8"	5/16"	5/16"	3"	2	2	Keo	2728A24	00000
		4	1/8"	5/16"	5/16"	4"	2	2	Keo	2728A25	00000
		4	1/8"	5/16"	5/16"	5"	2	2	Keo	2728A26	00000
		4	1/8"	5/16"	5/16"	6"	2	2	Keo	2728A27	00000
		4 1/2	9/64"	3/8"	3/8"	4"	2	2	Keo	2728A28	00000
		4 1/2	9/64"	3/8"	3/8"	5"	2	2	Keo	2728A29	00000
		4 1/2	9/64"	3/8"	3/8"	6"	2	2	Keo	2728A31	00000
		5	3/16"	7/16"	7/16"	4"	2	2	Keo	2728A32	00000
		5	3/16"	7/16"	7/16"	5"	2	2	Keo	2728A33	00000


		5	3/16"	7/16"	7/16"	6"	2	2	Keo	2728A34	000000
		6	7/32"	1/2"	1/2"	4"	2	2	Keo	2728A35	00000
		6	7/32"	1/2"	1/2"	5"	2	2	Keo	2728A36	00000
		6	7/32"	1/2"	1/2"	6"	2	2	Keo	2728A37	000000
		7	1/4"	5/8"	5/8"	6"	2	2	Keo	2728A38	000000
		8	5/16"	3/4"	3/4"	6"	2	2	Keo	2728A39	000000

Carbide

The hardest and most wear-resistant center drills 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.

60° Countersink Angle—The most common center drill angle. The short and sturdy tip starts holes that perfectly match lathe centers.

82° Countersink Angle—Start a hole with cone-shaped recesses so inch screws sit flush with the surface.

90° Countersink Angle—Start a hole with cone-shaped recesses so metric screws sit flush with the surface.

Uncoated—Suitable for most tasks, but won't last as long as coated center drills.

Titanium Carbon Nitride (TiCN) Coated—Resist heat, chipping, and wear, to last up to three times longer than an uncoated option.

Titanium Aluminum Nitride (TiAlN) Coated—Harder than TiCN, these center drills cut metal as hard as Rockwell C50, such as iron and titanium, without chipping.

Aluminum Titanium Nitride (AlTiN) Coated—The hardest and most wear-resistant coating we offer, these center drills cut through metals as hard as Rockwell C70 without losing their sharp cutting edges.

			Dia.						Uncoated		Titanium Carbon Nitride (TiCN) Coated		Titanium Aluminum Nitride (TiAlN) Coated		Aluminum Titanium Nitride (AlTiN) Coated
	Trade Size	Drill Bit Size	Body	Shank	Overall Lg.	No. of Flutes	No. of Countersinking Ends	Mfr.		Each		Each		Each		Each
60° Countersink Angle



		00	0.025"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A17	000000	2936A111	000000	2936A114	000000	2936A221	000000


		0	1/32"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A18	00000	2936A121	00000	2936A124	00000	2936A224	00000
		1	3/64"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A11	00000	2936A131	00000	2936A134	00000	2936A227	00000
		2	5/64"	3/16"	3/16"	2"	2	2	Ultra Tool	2925A12	00000	2936A141	00000	2936A144	00000	2936A231	00000
		3	7/64"	1/4"	1/4"	2"	2	2	Ultra Tool	2925A13	00000	2936A151	00000	2936A154	00000	2936A234	00000
		4	1/8"	5/16"	5/16"	2 1/2"	2	2	Ultra Tool	2925A14	00000	2936A161	00000	2936A164	00000	2936A237	00000
		5	3/16"	7/16"	7/16"	2 3/4"	2	2	Ultra Tool	2925A15	00000	2936A171	000000	2936A174	000000	2936A241	000000
		6	7/32"	1/2"	1/2"	3"	2	2	Ultra Tool	2925A16	00000	2936A181	000000	2936A184	000000	2936A244	000000
		7	1/4"	5/8"	5/8"	3 1/2"	2	2	Ultra Tool	2925A19	000000	2936A191	000000	2936A194	000000	2936A247	000000
		8	5/16"	3/4"	3/4"	4"	2	2	Ultra Tool	2925A21	000000	2936A211	000000	2936A214	000000	2936A251	000000


		82° Countersink Angle



				00	0.025"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A23	00000	2936A112	00000	2936A115	00000	2936A222	00000


				0	1/32"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A24	00000	2936A122	00000	2936A125	00000	2936A225	00000
				1	3/64"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A25	00000	2936A132	00000	2936A135	00000	2936A228	00000
				2	5/64"	3/16"	3/16"	2"	2	2	Ultra Tool	2925A26	00000	2936A142	00000	2936A145	00000	2936A232	00000
				3	7/64"	1/4"	1/4"	2"	2	2	Ultra Tool	2925A27	00000	2936A152	00000	2936A155	00000	2936A235	00000
				4	1/8"	5/16"	5/16"	2 1/2"	2	2	Ultra Tool	2925A28	00000	2936A162	00000	2936A165	00000	2936A238	00000
				5	3/16"	7/16"	7/16"	2 3/4"	2	2	Ultra Tool	2925A29	00000	2936A172	000000	2936A175	000000	2936A242	000000
				6	7/32"	1/2"	1/2"	3"	2	2	Ultra Tool	2925A31	00000	2936A182	000000	2936A185	000000	2936A245	000000
				7	1/4"	5/8"	5/8"	3 1/2"	2	2	Ultra Tool	2925A32	000000	2936A192	000000	2936A195	000000	2936A248	000000
				8	5/16"	3/4"	3/4"	4"	2	2	Ultra Tool	2925A33	000000	2936A212	000000	2936A215	000000	2936A252	000000


				90° Countersink Angle



						00	0.025"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A34	00000	2936A113	00000	2936A116	00000	2936A223	00000


						0	1/32"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A35	00000	2936A123	00000	2936A126	00000	2936A226	00000
						1	3/64"	1/8"	1/8"	1 1/2"	2	2	Ultra Tool	2925A36	00000	2936A133	00000	2936A136	00000	2936A229	00000
						2	5/64"	3/16"	3/16"	2"	2	2	Ultra Tool	2925A37	00000	2936A143	00000	2936A146	00000	2936A233	00000
						3	7/64"	1/4"	1/4"	2"	2	2	Ultra Tool	2925A38	00000	2936A153	00000	2936A156	00000	2936A236	00000
						4	1/8"	5/16"	5/16"	2 1/2"	2	2	Ultra Tool	2925A39	00000	2936A163	00000	2936A166	00000	2936A239	00000
						5	3/16"	7/16"	7/16"	2 3/4"	2	2	Ultra Tool	2925A41	00000	2936A173	000000	2936A176	000000	2936A243	000000
						6	7/32"	1/2"	1/2"	3"	2	2	Ultra Tool	2925A42	00000	2936A183	000000	2936A186	000000	2936A246	000000
						7	1/4"	5/8"	5/8"	3 1/2"	2	2	Ultra Tool	2925A43	000000	2936A193	000000	2936A196	000000	2936A249	000000
						8	5/16"	3/4"	3/4"	4"	2	2	Ultra Tool	2925A44	000000	2936A213	000000	2936A216	000000	2936A253	000000

Hole-Starting Carbide Drill Bits


Short Length Round Shank	Standard

Harder and more wear resistant than cobalt steel, these carbide bits create an accurate starting place in your workpiece. Cut an indent, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Carbide stays sharp at high temperatures and faster speeds. It can be brittle, however, so these bits require a rigid machine tool holder to prevent breakage and should not be used in hand drilling applications.

Short Length—The most rigid bits for drilling the straightest holes.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated bits, especially on materials like hardened steel, iron, and stainless steel.

Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.

Uncoated—Excellent for a range of materials but won't last as long as coated bits.

					Shank			90° Point Angle		120° Point Angle		140° Point Angle
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each		Each		Each
Short Length







				Titanium Nitride (TiN) Coated

				1/8"	0.125"	2"	1/8"	Round	1/8"	Standard	2911A634	000000	2911A641	000000	2911A647	000000


				3/16"	0.1875"	2"	3/16"	Round	3/16"	Standard	2911A635	00000	2911A642	00000	2911A648	00000
				1/4"	0.25"	2 1/2"	1/4"	Round	1/4"	Standard	2911A636	00000	2911A643	00000	2911A649	00000
				5/16"	0.3125"	2 1/2"	5/16"	Round	5/16"	Standard	2911A637	00000	2911A644	00000	2911A651	00000
				3/8"	0.375"	2 1/2"	3/8"	Round	3/8"	Standard	2911A638	00000	2911A645	00000	2911A652	00000
				1/2"	0.5"	3"	1/2"	Round	1/2"	Standard	2911A639	00000	2911A646	00000	2911A653	00000
				8 mm	0.315"	63 mm	8 mm	Round	8 mm	Standard	———	0	2911A41	00000	———	0




						Titanium Aluminum Nitride (TiAlN) Coated

						1/8"	0.125"	2"	1/8"	Round	1/8"	Standard	2911A654	00000	2911A661	00000	2911A667	00000


						3/16"	0.1875"	2"	3/16"	Round	3/16"	Standard	2911A655	00000	2911A662	00000	2911A668	00000
						1/4"	0.25"	2 1/2"	1/4"	Round	1/4"	Standard	2911A656	00000	2911A663	00000	2911A669	00000
						5/16"	0.3125"	2 1/2"	5/16"	Round	5/16"	Standard	2911A657	00000	2911A664	00000	2911A671	00000
						3/8"	0.375"	2 1/2"	3/8"	Round	3/8"	Standard	2911A658	00000	2911A665	00000	2911A672	00000
						1/2"	0.5"	3"	1/2"	Round	1/2"	Standard	2911A659	00000	2911A666	00000	2911A673	00000




								Uncoated

								1/8"	0.125"	2"	1/8"	Round	1/8"	Standard	2911A611	00000	2911A614	00000	2911A617	00000


								3/16"	0.1875"	2"	3/16"	Round	3/16"	Standard	2911A612	00000	2911A615	00000	2911A618	00000
								1/4"	0.25"	2 1/2"	1/4"	Round	1/4"	Standard	2911A29	00000	2911A39	00000	2911A51	00000
								5/16"	0.3125"	2 1/2"	5/16"	Round	5/16"	Standard	2911A613	00000	2911A616	00000	2911A619	00000
								3/8"	0.375"	2 1/2"	0.38"	Round	3/8"	Standard	2911A32	00000	2911A42	00000	2911A53	00000
								1/2"	0.5"	3"	1/2"	Round	1/2"	Standard	2911A33	00000	2911A43	00000	2911A54	00000
								5/8"	0.625"	3 1/2"	0.63"	Round	5/8"	Standard	2911A34	000000	2911A44	000000	2911A55	000000
								3 mm	0.1181"	57 mm	3 mm	Round	3 mm	Standard	2911A621	00000	2911A625	00000	2911A629	00000
								5 mm	0.1968"	63 mm	5 mm	Round	5 mm	Standard	2911A622	00000	2911A626	00000	2911A631	00000
								6 mm	0.2362"	63 mm	6 mm	Round	6 mm	Standard	2911A623	00000	2911A627	00000	2911A632	00000
								8 mm	0.315"	63 mm	8 mm	Round	8 mm	Standard	2911A31	00000	———	0	2911A52	00000


								10 mm	0.3937"	70 mm	10 mm	Round	10 mm	Standard	2911A624	00000	2911A628	00000	2911A633	00000

Center Drill Sets

A variety of sizes to create precisely centered holes that mate with lathe centers or to drill and countersink in a single step to install fasteners.

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

Carbide—The hardest and most wear-resistant center drills 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.

82° Countersink Angle—Start a hole with cone-shaped recesses so inch screws sit flush with the surface.

90° Countersink Angle—Start a hole with cone-shaped recesses so metric screws sit flush with the surface.

Uncoated—Suitable for most tasks, but won't last as long as coated center drills.

Titanium Carbon Nitride (TiCN) Coated—Resist heat, chipping, and wear, to last up to three times longer than an uncoated option.

Titanium Aluminum Nitride (TiAlN) Coated—Harder than TiCN, these center drills cut metal as hard as Rockwell C50, such as iron and titanium, without chipping.

						82° Countersink Angle		90° Countersink Angle
	No. of Pieces	Trade Size	Finish	Container Type	Mfr.		Each		Each
High-Speed Steel



		5	1, 2, 3, 4, 5	Uncoated	Plastic Case	Dormer Pramet	2917A2	000000	2917A3	000000


		Carbide



				6	1, 2, 3, 4, 5, 6	Uncoated	Metal Case	Ultra Tool	2925A72	000000	2925A73	000000


				6	1, 2, 3, 4, 5, 6	Titanium Carbon Nitride (TiCN) Coated	Metal Case	Ultra Tool	2936A321	000000	2936A331	000000
				6	1, 2, 3, 4, 5, 6	Titanium Aluminum Nitride (TiAlN) Coated	Metal Case	Ultra Tool	2936A322	000000	2936A332	000000
				6	1, 2, 3, 4, 5, 6	Aluminum Titanium Nitride (AlTiN) Coated	Metal Case	Ultra Tool	2936A323	000000	2936A333	000000

Hole-Starting Cobalt Steel Drill Bits

120° Point Angle

Standard

Create an accurate starting place in your workpiece. Cut an indent with these bits, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Cobalt steel resists wear to stay sharp when cutting hard materials, such as nickel. Also known as spotting drill bits.

Short Length—The most rigid bits for drilling the straightest holes.

Titanium Aluminum Nitride (TiAlN) Coated—The hardest and most wear-resistant coating, especially at high temperatures. These bits are best for hard and abrasive materials, such as iron, titanium, and fiberglass.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

					Shank			90° Point Angle		120° Point Angle
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each		Each
Short Length







				Titanium Aluminum Nitride (TiAlN) Coated

				1/4"	0.25"	2 5/8"	0.9"	Round	1/4"	Standard	27445A203	000000	27445A206	000000


				3/8"	0.375"	3 1/2"	1"	Round	3/8"	Standard	27445A204	00000	27445A207	00000
				1/2"	0.5"	4"	1.38"	Round	1/2"	Standard	27445A205	00000	27445A208	00000




						Uncoated

						1/8"	0.125"	2"	0.4"	Round	1/8"	Standard	27445A201	00000	———	0


						1/4"	0.25"	2 5/8"	0.9"	Round	1/4"	Standard	27445A11	00000	27445A21	00000
						3/8"	0.375"	3 1/2"	1"	Round	3/8"	Standard	27445A12	00000	27445A22	00000
						1/2"	0.5"	4"	1.38"	Round	1/2"	Standard	27445A13	00000	27445A23	00000
						5/8"	0.625"	4 1/2"	1.38"	Round	5/8"	Standard	27445A14	00000	27445A24	00000
						3/4"	0.75"	5 1/8"	1.63"	Round	3/4"	Standard	27445A17	00000	27445A27	00000
						3.0 mm	0.1181"	50 mm	10.2 mm	Round	3 mm	Standard	27445A202	00000	———	0
						4.0 mm	0.1575"	52 mm	12.7 mm	Round	4 mm	Standard	27445A15	00000	27445A25	00000
						5.0 mm	0.1968"	60 mm	15 mm	Round	5 mm	Standard	27445A16	00000	27445A26	00000
						6.0 mm	0.2362"	67 mm	20.3 mm	Round	6 mm	Standard	27445A91	00000	———	0
						8.0 mm	0.315"	79 mm	25.4 mm	Round	8 mm	Standard	27445A92	00000	———	0


						10.0 mm	0.3937"	89 mm	25.4 mm	Round	10 mm	Standard	27445A93	00000	———	0
						12.0 mm	0.4724"	102 mm	31.7 mm	Round	12 mm	Standard	27445A94	00000	———	0