6.7 mm 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.

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







				Black Oxide

				6.7	0.2638"	101	49.6	Round	6.7 mm	Standard	Dormer Pramet	2958A113	00000	—	———	0




						Titanium Nitride (TiN) Coated

						6.7	0.2638"	101	49.6	Round	6.7 mm	Standard	Dormer Pramet	8950A58	0000	—	———	0




								Gold Oxide

								6.7	0.2638"	105	69.9	Round	6.7 mm	Split	Viking Norseman Drill	30565A291	0000	10	30565A439	000000


								Short Length







												Titanium Nitride (TiN) Coated

												6.7	0.2638"	70	30.5	Round	6.7 mm	Split	Dormer Pramet	2979N26	0000	—	———	0

Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Short 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.

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

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.

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







				Titanium Nitride (TiN) Coated

				6.7	0.2638"	102	63	Round	6.7 mm	Split	Dormer Pramet	5058N68	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						6.7	0.2638"	101	63	Round	6.7 mm	Split	Chicago-Latrobe	2753A238	00000




								Gold Oxide

								6.7	0.2638"	101	49.6	Round	6.7 mm	Split	Dormer Pramet	29355A113	0000


								Short Length







												Titanium Nitride (TiN) Coated

												6.7	0.2638"	70	17.5	Round	6.7 mm	Split	Chicago-Latrobe	2456N156	00000




														Uncoated

														6.7	0.2638"	70	17.5	Round	6.7 mm	Split	Chicago-Latrobe	2456N128	0000

Chip-Clearing Cobalt Steel Drill Bits for Nickel and Stainless Steel

Jobbers' Length

Parabolic Flute

Round Shank

Split

Excellent for challenging metals such as stainless steel and nickel alloys, these bits cut aggressively and evacuate chips quickly. The grooved flutes prevent clogs and improve coolant flow to dissipate heat that can damage the bit or your material. Bits are made of tough and wear-resistant cobalt steel.

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	Flute Type	Type	Size, mm	Drill Bit Point Type	Mfr.		Each
Jobbers' Length







				Titanium Aluminum Nitride (TiAlN) Coated

				6.7	0.2638"	101	63	Parabolic	Round	6.7	Split	Guhring	3020A51	000000

Chip-Clearing Cobalt Steel Drill Bits


Jobbers' Length Parabolic Flute Round Shank	Split

Avoid clogs and dissipate heat with cobalt bits that last at least twice as long as high-speed steel. The flutes clear chips to improve coolant flow and prevent damage to the bit and the hole. They also speed up drilling since you don't have to stop to clear the bit manually.

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

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

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







				Uncoated

				6.7	0.2638"	102	61	Parabolic	Round	6.7	Split	Viking Norseman Drill	2771N57	000000

Hex-Bit Taps

You only need one tool to turn these taps and install screws. The _1/4" hex shank fits hand or powered screwdrivers for threading holes. Then switch to a screwdriver bit to finish the job. To tap in hard-to-reach spots, add a bit extension. Taps have straight flutes that are good for most jobs.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

Uncoated—The economical choice, these won't last as long as coated taps.

Plug Chamfer—Our go-to chamfer type, these thread both through holes and blind holes. The tapered section is shorter than a taper chamfer and longer than bottoming chamfer. As a result, they're easier to turn than bottoming taps but require more force than taper taps.

						Drill Bit				Plug Chamfer
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size, mm	Decimal Size Equiv.	Shank Type	Hex Shank Size		Each
High-Speed Steel







				Uncoated

				M8 × 1.25 mm	3/4"	1 9/16"	Metric	4	6.7	0.2637"	Hex	1/4"	1021N28	000000

Quick-Change Hex Shank Drill Taps for Drills and Screwdrivers

Save time when you need to change drill taps frequently. The grooved shank snaps directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank. However, they’re not rated for impact drivers. With a drill bit point to drive into the workpiece, these taps can drill and tap holes in a single step. They’re made of high-speed steel and are for use on most metal and plastic.

Their spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. All have a plug chamfer with 3-5 chamfered cutting threads, so they’re suitable for start-to-finish tapping.

Uncoated High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium Nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

	Thread			Drill Bit								Plug Chamfer
	Size	Lg.	Overall Lg.	Size, mm	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit	Hex Shank Size		Each
Uncoated High-Speed Steel



		M8 × 1.25 mm	15/16"	3 23/32"	6.7	0.2637"	118°	Spiral	2	Metric	D5	1/4"	3464A55	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				M8 × 1.25 mm	15/16"	3 23/32"	6.7	0.2637"	118°	Spiral	2	Metric	D5	1/4"	3464A131	00000

Drill Taps

Spiral Flute

Drill holes and cut threads without switching tools. Made of high-speed steel, these taps are for use on most metal and plastic. The square shank is compatible with tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.

Uncoated High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium Nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

Spiral Flute—Taps with spiral flutes keep chips clear by drawing them back toward the tap and out of the hole.

	Thread			Drill Bit							Plug Chamfer
	Size	Lg.	Overall Lg.	Size, mm	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel



		M8 × 1.25 mm	15/16"	2 27/32"	6.7	0.2637"	110°	Spiral	2	Metric	D5	2748A66	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				M8 × 1.25 mm	15/16"	2 23/32"	6.7	0.2637"	118°	Spiral	2	Metric	D6	2748A96	00000

Undersized Hardened Multipurpose M2 High-Speed Tool Steel Rods

These rods, also known as drill blanks, have an undersized diameter for machining your own drill bits. They're hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Dia., mm	Dia. Tolerance, mm	Drill Bit Size, mm	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
6.7	-0.005 to 0	6.7	4 1/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A344	00000