7/8" Long Drill Bits | McMaster-Carr

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

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






				Black Oxide

				78 Ga.	0.016"	7/8"	0.16"	Round	0.016"	Standard	2901A256	00000


				77 Ga.	0.018"	7/8"	0.16"	Round	0.018"	Standard	2901A255	0000
				76 Ga.	0.02"	7/8"	0.15"	Round	0.02"	Standard	2901A254	0000




						Titanium Nitride (TiN) Coated

						78 Ga.	0.016"	7/8"	0.16"	Round	0.016"	Standard	29045A838	0000


						77 Ga.	0.018"	7/8"	0.16"	Round	0.018"	Standard	29045A837	0000
						76 Ga.	0.02"	7/8"	0.15"	Round	0.02"	Standard	29045A836	0000




								Uncoated

								78 Ga.	0.016"	7/8"	0.16"	Round	0.016"	Standard	30585A96	0000


								77 Ga.	0.018"	7/8"	0.16"	Round	0.018"	Standard	30585A95	0000
								76 Ga.	0.02"	7/8"	0.15"	Round	0.02"	Standard	30585A94	0000


								Short Length
								Threaded Shank Split






												Black Oxide

												9/64"	0.1406"	7/8"	0.44"	Threaded	1/4"	Split	8824A29	0000


												5/32"	0.1563"	7/8"	0.44"	Threaded	1/4"	Split	8824A67	0000
												11/64"	0.1719"	7/8"	0.38"	Threaded	1/4"	Split	8824A76	0000
												3/16"	0.1875"	7/8"	0.38"	Threaded	1/4"	Split	8824A71	0000
												7/32"	0.2188"	7/8"	0.38"	Threaded	1/4"	Split	8824A93	0000
												1/4"	0.25"	7/8"	0.38"	Threaded	1/4"	Split	8824A73	0000
												30 Ga.	0.1285"	7/8"	0.44"	Threaded	1/4"	Split	8824A65	0000
												27 Ga.	0.144"	7/8"	0.44"	Threaded	1/4"	Split	8824A66	0000
												21 Ga.	0.159"	7/8"	0.44"	Threaded	1/4"	Split	8824A68	0000
												20 Ga.	0.161"	7/8"	0.44"	Threaded	1/4"	Split	8824A69	0000
												13 Ga.	0.185"	7/8"	0.38"	Threaded	1/4"	Split	8824A79	0000


												12 Ga.	0.189"	7/8"	0.38"	Threaded	1/4"	Split	8824A83	0000
11 Ga.												0.191"	7/8"	0.38"	Threaded	1/4"	Split	8824A86	0000
10 Ga.	0.1935"											7/8"	0.38"	Threaded	1/4"	Split	8824A72	0000

Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Standard

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.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

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

					Shank				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-11	12-Up
Jobbers' Length







				Titanium Nitride (TiN) Coated

				78 Ga.	0.016"	7/8"	0.19"	Round	0.016"	Standard	27995A819	00000	00000


				77 Ga.	0.018"	7/8"	0.19"	Round	0.018"	Standard	27995A821	0000	0000
				76 Ga.	0.02"	7/8"	0.19"	Round	0.02"	Standard	27995A822	0000	0000




						Uncoated

						78 Ga.	0.016"	7/8"	0.16"	Round	0.016"	Standard	3033A296	0000	0000


						77 Ga.	0.018"	7/8"	0.16"	Round	0.018"	Standard	3033A295	0000	0000
						76 Ga.	0.02"	7/8"	0.15"	Round	0.02"	Standard	3033A294	0000	0000

Depth-Limiting Drill Stops

Image of ProductInUse. Front orientation. Drill Stops.

Ensure identical hole depths every time. Position the collar on your bit and tighten the set screw.

	For Drill Bit Size Decimal Equiv.	Overall Lg.	OD	Hex Key Size for Set Screw	Material		Each
For Inch Drill Bits



	3/8"	0.3750"	7/8"	7/8"	3/32"	Steel	8865A216	00000


	25/64"	0.3906"	7/8"	7/8"	1/8"	Steel	8865A221	0000
	13/32"	0.4063"	7/8"	7/8"	1/8"	Steel	8865A225	0000
	27/64"	0.4219"	7/8"	7/8"	1/8"	Steel	8865A227	0000
	7/16"	0.4375"	7/8"	7/8"	1/8"	Steel	8865A229	0000
	29/64"	0.4531"	7/8"	7/8"	1/8"	Steel	8865A231	0000
	15/32"	0.4688"	7/8"	7/8"	1/8"	Steel	8865A232	0000
	31/64"	0.4844"	7/8"	7/8"	1/8"	Steel	8865A234	0000
	1/2"	0.5000"	7/8"	7/8"	1/8"	Steel	8865A235	0000


	For Metric Drill Bits



			9.8 mm	0.3858"	7/8"	7/8"	1/8"	Steel	8865A218	0000


			10.0 mm	0.3937"	7/8"	7/8"	1/8"	Steel	8865A222	0000
			11.0 mm	0.4331"	7/8"	7/8"	1/8"	Steel	8865A228	0000
			12.0 mm	0.4724"	7/8"	7/8"	1/8"	Steel	8865A233	0000


			For Letter Size Drill Bits



					V	0.3770"	7/8"	7/8"	1/8"	Steel	8865A217	0000


					W	0.3860"	7/8"	7/8"	1/8"	Steel	8865A219	0000
					X	0.3970"	7/8"	7/8"	1/8"	Steel	8865A223	0000
					Y	0.4040"	7/8"	7/8"	1/8"	Steel	8865A224	0000
					Z	0.4130"	7/8"	7/8"	1/8"	Steel	8865A226	0000

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

The choice if you're countersinking lots of holes, these wear-resistant countersinks cut faster and last longer than carbon steel.

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.

	Countersinks							Counterbore Collars
					Uncoated
	Body Dia.	For Drill Bit Size	For Screw Size	Overall Lg.	Mfr.		Each	OD	Wd.		Each
4 Flutes







				82° Countersink Angle

				3/8"	1/8"	No. 5	7/8"	W. L. Fuller	2910A13	000000	5/8"	1/4"	2903A13	00000


				3/8"	9/64"	No. 6	7/8"	W. L. Fuller	2910A14	00000	5/8"	1/4"	2903A13	0000
				3/8"	5/32"	No. 7	7/8"	W. L. Fuller	2910A15	00000	5/8"	1/4"	2903A13	0000
				3/8"	11/64"	No. 8	7/8"	W. L. Fuller	2910A16	00000	5/8"	1/4"	2903A13	0000
				3/8"	3/16"	No. 9	7/8"	W. L. Fuller	2910A17	00000	5/8"	1/4"	2903A13	0000
				3/8"	13/64"	No. 10	7/8"	W. L. Fuller	2910A29	00000	5/8"	1/4"	2903A13	0000
				3/8"	7/32"	No. 12	7/8"	W. L. Fuller	2910A31	00000	5/8"	1/4"	2903A13	0000
				7/16"	13/64"	No. 10	7/8"	W. L. Fuller	2910A18	00000	11/16"	1/4"	2903A14	0000
				1/2"	5/32"	No. 7	7/8"	W. L. Fuller	2910A32	00000	3/4"	1/4"	2903A15	0000
				1/2"	3/16"	No. 9	7/8"	W. L. Fuller	2910A27	00000	3/4"	1/4"	2903A15	0000
				1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2910A19	00000	3/4"	1/4"	2903A15	0000


				1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2910A21	00000	3/4"	1/4"	2903A15	0000
				1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2910A22	00000	3/4"	1/4"	2903A15	0000




						90° Countersink Angle

						3/8"	1/8"	No. 5	7/8"	W. L. Fuller	2910A73	00000	5/8"	1/4"	2903A13	0000


						3/8"	9/64"	No. 6	7/8"	W. L. Fuller	2910A74	00000	5/8"	1/4"	2903A13	0000
						3/8"	5/32"	No. 7	7/8"	W. L. Fuller	2910A75	00000	5/8"	1/4"	2903A13	0000
						3/8"	11/64"	No. 8	7/8"	W. L. Fuller	2910A76	00000	5/8"	1/4"	2903A13	0000
						3/8"	3/16"	No. 9	7/8"	W. L. Fuller	2910A77	00000	5/8"	1/4"	2903A13	0000
						3/8"	13/64"	No. 10	7/8"	W. L. Fuller	2910A89	00000	5/8"	1/4"	2903A13	0000
						3/8"	7/32"	No. 12	7/8"	W. L. Fuller	2910A91	00000	5/8"	1/4"	2903A13	0000
						7/16"	13/64"	No. 10	7/8"	W. L. Fuller	2910A78	00000	11/16"	1/4"	2903A14	0000
						1/2"	5/32"	No. 7	7/8"	W. L. Fuller	2910A92	00000	3/4"	1/4"	2903A15	0000
						1/2"	3/16"	No. 9	7/8"	W. L. Fuller	2910A87	00000	3/4"	1/4"	2903A15	0000
						1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2910A79	00000	3/4"	1/4"	2903A15	0000


						1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2910A81	00000	3/4"	1/4"	2903A15	0000
						1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2910A82	00000	3/4"	1/4"	2903A15	0000

Carbon Steel

4 Flutes

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							Counterbore Collars
					Uncoated
	Body Dia.	For Drill Bit Size	For Screw Size	Overall Lg.	Mfr.		Each	OD	Wd.		Each
4 Flutes







				82° Countersink Angle

				5/16"	7/64"	No. 4	7/8"	W. L. Fuller	2785A13	000000	9/16"	1/4"	2903A12	00000


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


				1/2"	13/64"	No. 10	7/8"	W. L. Fuller	2785A38	00000	3/4"	1/4"	2903A15	0000
				1/2"	7/32"	No. 12	7/8"	W. L. Fuller	2785A39	00000	3/4"	1/4"	2903A15	0000
				1/2"	1/4"	No. 14	7/8"	W. L. Fuller	2785A52	00000	3/4"	1/4"	2903A15	0000

Chip-Clearing High-Speed Steel Drill Bits


Jobbers' Length High Helix Flute Round Shank	Standard

With flutes that lift chips out of the hole, you don't have to stop drilling to clear these bits manually. They improve coolant flow to dissipate heat and prevent clogs that can damage the bit and ruin the hole. High-speed steel is good for general purpose drilling in most metals.

High Helix Flute—Less aggressive than parabolic flutes for cleaner cuts in soft metals.

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

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

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







				Uncoated

				78 Ga.	0.016"	7/8"	0.16"	High Helix	Round	0.016"	Standard	2912A257	00000


				77 Ga.	0.018"	7/8"	0.16"	High Helix	Round	0.018"	Standard	2912A256	0000
				76 Ga.	0.02"	7/8"	0.15"	High Helix	Round	0.02"	Standard	2912A255	0000

Strong-Hold Bit Adapters for Ratchet Wrenches

Set-Screw Bit

Holder

Lock your bit into the adapter to prevent accidental disengagement. These adapters fit square-drive tools and accept hex-shank screwdriver bits. They have nonmagnetic bit holders, so they won’t attract loose metal parts and shavings.

	For Bit Shank Type	For Bit Hex Shank Size	Overall Lg.	Material		Each
Set-Screw Bit Holder



	1/4"	Hex	1/4"	7/8"	Steel	7229A77	00000

Finger-Tightening Socket Adapters

Fit these adapters between a wrench and socket to enable finger tightening. Also known as spinners.

Square Drive Size Socket Adapter—Square drive size adapters also convert one square drive size to another.

	Head Dia.	Overall Lg.	Material		Each
Finger-Tightening Adapters



	1/4" (Female) × 1/4" (Male)	1"	7/8"	Chrome-Plated Steel	5521A14	00000


	Finger-Tightening Adapters/Square Drive Size Adapters



			1/4" (Female) × 3/8" (Male)	13/16"	7/8"	Chrome-Plated Steel	6452A11	00000

Impact Square Drive Size Adapters

Ball Detent Socket

Retainer

Convert from one square drive size to another. The female side of the adapter attaches to your wrench; the male side to your socket. These adapters are made to withstand the high torque and force of impact tools.

Overall Lg.	Material	Color	Socket Retainer Style		Each



1/4" (Female) × 3/8" (Male)	7/8"	Magnesium Phosphate-Coated Steel	Black	Ball Detent	53055A101	000000