Gold Oxide Drill Bits | McMaster-Carr

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Viking Norseman Drill

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About Drill Bits

Compare material, finish, length class, and decimal size equivalents.

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Split

With flutes that spiral in the opposite direction of other bits, these are primarily used to remove stripped screws. Choose a bit that’s slightly smaller than the diameter of the screw’s head. Set your power tool to rotate in reverse. Slowly drill in the center of the screw head, maintaining constant pressure. As the bit penetrates, it will catch onto the screw and reverse it out of the hole. If the screw is badly stripped, you might need to punch a starter hole. Also known as reverse-flute bits. High-speed steel is the versatile choice for drilling most metals.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Gold Oxide—Like black oxide, this finish adds wear resistance and reduces friction for improved chip flow. Because it’s less prone to flaking off, it offers better rust protection when bits aren't in use.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Mfr.		Each
Jobbers' Length







				Gold Oxide

				1/16"	0.0625"	1 7/8"	0.75"	Round	1/16"	Split	ICS	88055A41	00000


				5/64"	0.0781"	2"	0.88"	Round	5/64"	Split	ICS	88055A42	0000
				3/32"	0.0938"	2 1/4"	1.22"	Round	3/32"	Split	ICS	88055A43	0000
				7/64"	0.1094"	2 5/8"	1.47"	Round	7/64"	Split	ICS	88055A44	0000
				1/8"	0.125"	2 3/4"	1.5"	Round	1/8"	Split	ICS	88055A45	0000
				9/64"	0.1406"	2 7/8"	1.63"	Round	9/64"	Split	ICS	88055A61	0000
				5/32"	0.1563"	3 1/8"	1.88"	Round	5/32"	Split	ICS	88055A46	0000
				11/64"	0.1719"	3 1/4"	2.09"	Round	11/64"	Split	ICS	88055A62	0000
				3/16"	0.1875"	3 1/2"	2.28"	Round	3/16"	Split	ICS	88055A47	0000
				13/64"	0.2031"	3 5/8"	2.41"	Round	13/64"	Split	ICS	88055A63	0000
				7/32"	0.2188"	3 3/4"	2.47"	Round	7/32"	Split	ICS	88055A64	00000


				15/64"	0.2344"	3 7/8"	2.5"	Round	15/64"	Split	ICS	88055A65	00000
				1/4"	0.25"	4"	2.63"	Round	1/4"	Split	ICS	88055A48	00000
				17/64"	0.2656"	4 1/8"	2.75"	Round	17/64"	Split	ICS	88055A66	00000
				9/32"	0.2813"	4 1/4"	2.81"	Round	9/32"	Split	ICS	88055A67	00000
				19/64"	0.2969"	4 3/8"	2.94"	Round	19/64"	Split	ICS	88055A49	00000
				5/16"	0.3125"	4 1/2"	3.16"	Round	5/16"	Split	ICS	88055A51	00000
				3/8"	0.375"	5"	3.5"	Round	3/8"	Split	ICS	88055A52	00000
				7/16"	0.4375"	5 1/2"	3.94"	Round	7/16"	Split	ICS	88055A53	00000
				1/2"	0.5"	6"	4.45"	Round	1/2"	Split	ICS	88055A54	00000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Split

Tough and wear resistant, cobalt steel bits last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without being damaged on hard materials, such as nickel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

					Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type	Mfr.		Each
Jobbers' Length







				Gold Oxide

				1.0	0.0394"	34	10	Round	1 mm	Split	Dormer Pramet	29355A11	00000


				1.05	0.0413"	34	9.9	Round	1.1 mm	Split	Dormer Pramet	29355A12	0000
				1.1	0.0433"	36	11.8	Round	1.1 mm	Split	Dormer Pramet	29355A13	0000
				1.15	0.0453"	36	11.7	Round	1.2 mm	Split	Dormer Pramet	29355A14	0000
				1.2	0.0472"	38	13.6	Round	1.2 mm	Split	Dormer Pramet	29355A15	0000
				1.25	0.0492"	38	13.5	Round	1.3 mm	Split	Dormer Pramet	29355A16	0000
				1.3	0.0512"	38	13.4	Round	1.3 mm	Split	Dormer Pramet	29355A17	0000
				1.35	0.0531"	40	15.3	Round	1.4 mm	Split	Dormer Pramet	29355A18	0000
				1.4	0.0551"	40	15.2	Round	1.4 mm	Split	Dormer Pramet	29355A19	0000
				1.45	0.0571"	40	15.1	Round	1.5 mm	Split	Dormer Pramet	29355A21	0000
				1.5	0.0591"	40	15	Round	1.5 mm	Split	Dormer Pramet	29355A22	0000


				1.55	0.061"	43	16.9	Round	1.6 mm	Split	Dormer Pramet	29355A23	0000
				1.6	0.063"	43	16.8	Round	1.6 mm	Split	Dormer Pramet	29355A24	0000
				1.65	0.065"	43	16.7	Round	1.7 mm	Split	Dormer Pramet	29355A25	0000
				1.7	0.0669"	43	16.6	Round	1.7 mm	Split	Dormer Pramet	29355A26	0000
				1.75	0.0689"	46	18.5	Round	1.8 mm	Split	Dormer Pramet	29355A27	0000
				1.8	0.0709"	46	18.4	Round	1.8 mm	Split	Dormer Pramet	29355A28	0000
				1.85	0.0728"	46	18.3	Round	1.9 mm	Split	Dormer Pramet	29355A29	0000
				1.9	0.0748"	46	18.2	Round	1.9 mm	Split	Dormer Pramet	29355A31	0000
				1.95	0.0768"	49	20.1	Round	2 mm	Split	Dormer Pramet	29355A32	0000
				2.0	0.0787"	49	20	Round	2 mm	Split	Dormer Pramet	29355A33	0000


				2.05	0.0807"	49	19.9	Round	2.1 mm	Split	Dormer Pramet	29355A34	0000
				2.1	0.0827"	49	19.8	Round	2.1 mm	Split	Dormer Pramet	29355A35	0000
				2.2	0.0866"	53	22.6	Round	2.2 mm	Split	Dormer Pramet	29355A37	0000
				2.3	0.0906"	53	22.4	Round	2.3 mm	Split	Dormer Pramet	29355A39	0000
				2.35	0.0925"	53	22.3	Round	2.4 mm	Split	Dormer Pramet	29355A41	0000
				2.4	0.0945"	57	25.2	Round	2.4 mm	Split	Dormer Pramet	29355A42	0000
				2.5	0.0984"	57	25	Round	2.5 mm	Split	Dormer Pramet	29355A44	0000
				2.6	0.1024"	57	24.8	Round	2.6 mm	Split	Dormer Pramet	29355A45	0000
				2.7	0.1063"	61	27.6	Round	2.7 mm	Split	Dormer Pramet	29355A46	0000
				2.8	0.1102"	61	27.4	Round	2.8 mm	Split	Dormer Pramet	29355A48	0000


				2.9	0.1142"	61	27.2	Round	2.9 mm	Split	Dormer Pramet	29355A49	0000
				3.0	0.1181"	61	27	Round	3 mm	Split	Dormer Pramet	29355A51	0000
				3.1	0.122"	65	29.8	Round	3.1 mm	Split	Dormer Pramet	29355A52	0000
				3.2	0.126"	65	29.6	Round	3.2 mm	Split	Dormer Pramet	29355A53	0000
				3.3	0.1299"	65	29.4	Round	3.3 mm	Split	Dormer Pramet	29355A55	0000
				3.4	0.1339"	70	32.2	Round	3.4 mm	Split	Dormer Pramet	29355A56	0000
				3.5	0.1378"	70	32	Round	3.5 mm	Split	Dormer Pramet	29355A57	0000
				3.6	0.1417"	70	31.8	Round	3.6 mm	Split	Dormer Pramet	29355A58	0000
				3.7	0.1457"	70	31.6	Round	3.7 mm	Split	Dormer Pramet	29355A59	0000
				3.8	0.1496"	75	35.4	Round	3.8 mm	Split	Dormer Pramet	29355A62	0000


				4.0	0.1575"	75	35	Round	4 mm	Split	Dormer Pramet	29355A64	0000
				4.1	0.1614"	75	34.8	Round	4.1 mm	Split	Dormer Pramet	29355A65	0000
				4.2	0.1654"	75	34.6	Round	4.2 mm	Split	Dormer Pramet	29355A66	0000
				4.3	0.1693"	80	38.4	Round	4.3 mm	Split	Dormer Pramet	29355A68	0000
4.5				0.1772"	80	38	Round	4.5 mm	Split	Dormer Pramet	29355A71	0000
4.7	0.185"			80	37.6	Round	4.7 mm	Split	Dormer Pramet	29355A73	0000
4.8	0.189"			86	42.4	Round	4.8 mm	Split	Dormer Pramet	29355A75	0000
5.0	0.1969"			86	42	Round	5 mm	Split	Dormer Pramet	29355A77	0000
5.1	0.2008"			86	41.8	Round	5.1 mm	Split	Dormer Pramet	29355A78	0000
5.2	0.2047"	86		41.6	Round	5.2 mm	Split	Dormer Pramet	29355A79	0000
5.3	0.2087"	86	41.5	Round	5.3 mm	Split	Dormer Pramet	29355A82	0000
5.5	0.2165"	93	46	Round	5.5 mm	Split	Dormer Pramet	29355A84	0000
5.6	0.2205"	93	45.8	Round	5.6 mm	Split	Dormer Pramet	29355A85	0000
5.7	0.2244"	93	45.6	Round	5.7 mm	Split	Dormer Pramet	29355A86	0000
5.9	0.2323"	93	45.2	Round	5.9 mm	Split	Dormer Pramet	29355A91	0000
6.0	0.2362"	93	45	Round	6 mm	Split	Dormer Pramet	29355A92	0000
6.1	0.2402"	101	50.8	Round	6.1 mm	Split	Dormer Pramet	29355A93	0000
6.2	0.2441"	101	50.6	Round	6.2 mm	Split	Dormer Pramet	29355A94	0000
6.3	0.248"	101	50.4	Round	6.3 mm	Split	Dormer Pramet	29355A96	0000
6.4	0.252"	101	50.2	Round	6.4 mm	Split	Dormer Pramet	29355A97	0000
6.5	0.2559"	101	50	Round	6.5 mm	Split	Dormer Pramet	29355A98	0000
6.6	0.2598"	101	49.8	Round	6.6 mm	Split	Dormer Pramet	29355A112	0000
6.7	0.2638"	101	49.6	Round	6.7 mm	Split	Dormer Pramet	29355A113	0000
6.8	0.2677"	109	55.4	Round	6.8 mm	Split	Dormer Pramet	29355A115	0000
6.9	0.2717"	109	55.2	Round	6.9 mm	Split	Dormer Pramet	29355A116	00000
7.0	0.2756"	109	55	Round	7 mm	Split	Dormer Pramet	29355A117	0000
7.5	0.2953"	109	54	Round	7.5 mm	Split	Dormer Pramet	29355A124	00000
7.8	0.3071"	117	59.4	Round	7.8 mm	Split	Dormer Pramet	29355A128	00000
7.9	0.311"	117	59.2	Round	7.9 mm	Split	Dormer Pramet	29355A131	00000
8.2	0.3223"	117	58.6	Round	8.2 mm	Split	Dormer Pramet	29355A134	00000
8.4	0.3307"	117	58.2	Round	8.4 mm	Split	Dormer Pramet	29355A137	00000
8.5	0.3346"	117	58	Round	8.5 mm	Split	Dormer Pramet	29355A138	00000
8.8	0.3465"	125	63.4	Round	8.8 mm	Split	Dormer Pramet	29355A143	00000
9.0	0.3543"	125	63	Round	9 mm	Split	Dormer Pramet	29355A145	00000
9.4	0.3701"	125	62.2	Round	9.4 mm	Split	Dormer Pramet	29355A151	00000
9.5	0.374"	125	62	Round	9.5 mm	Split	Dormer Pramet	29355A152	00000
9.6	0.378"	133	67.8	Round	9.6 mm	Split	Dormer Pramet	29355A153	00000
9.7	0.3819"	133	67.6	Round	9.7 mm	Split	Dormer Pramet	29355A154	00000
10.0	0.3937"	133	67	Round	10 mm	Split	Dormer Pramet	29355A158	00000
10.2	0.4016"	133	66.6	Round	10.2 mm	Split	Dormer Pramet	29355A159	00000
10.5	0.4134"	133	66	Round	10.5 mm	Split	Dormer Pramet	29355A161	00000
10.8	0.4252"	142	72.4	Round	10.8 mm	Split	Dormer Pramet	29355A162	00000
11.0	0.4331"	142	72	Round	11 mm	Split	Dormer Pramet	29355A163	00000
11.5	0.4528"	142	71	Round	11.5 mm	Split	Dormer Pramet	29355A165	00000
11.8	0.4646"	142	70.4	Round	11.8 mm	Split	Dormer Pramet	29355A166	00000
12.0	0.4724"	151	77	Round	12 mm	Split	Dormer Pramet	29355A167	00000
12.5	0.4921"	151	76	Round	12.5 mm	Split	Dormer Pramet	29355A169	00000
13.0	0.5118"	151	75	Round	13 mm	Split	Dormer Pramet	29355A171	00000

Chip-Clearing Tap and Drill Bit Sets for Through Holes

Also known as gun taps, the taps in these sets have spiral-point flutes that push chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent buildup, they produce threads more efficiently than standard taps and are suitable for production work. Taps have a square shank for compatibility with tap wrenches and tap holders for drill presses and milling machines. With a plug chamfer, they have 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. All taps and drill bits are made of high-speed steel for use on most metal and plastic.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type	Mfr.		Each
Gold-Oxide High-Speed Steel Tap



	18	Plug	6-40 8-36 10-24 10-32 1/4"-28 5/16"-24 3/8"-24 7/16"-20 1/2"-20	2 1/16" 2 7/32" 2 15/32" 2 5/8" 2 7/8" 3 1/8" 3 5/32" 3 3/8"	UNF	2, 3	H2, H3	29/64" 25/64" 33 ga. 29 ga. 25 ga. 21 ga. 3 ga. I Q	Black/Gold Oxide High-Speed Steel	Metal Case	Viking Norseman Drill	27275A32	0000000


	18	Plug	M2.5 × 0.45 mm M3 × 0.5 mm M3.5 × 0.6 mm M4 × 0.7 mm M5 × 0.8 mm M6 × 1.00 mm M8 × 1.25 mm M10 × 1.5 mm M12 × 1.75 mm	1 13/16" 1 15/16" 2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 3/8"	Metric	2, 3	D3, D4, D5, D6	2.05 mm 2.5 mm 2.9 mm 3.3 mm 4.2 mm 5 mm 6.7 mm 8.5 mm 10.2 mm	Black/Gold Oxide High-Speed Steel	Metal Case	Viking Norseman Drill	27275A11	000000