6.4mm Shank Size Drill Bits

Drill multiple hole sizes using only one bit. These have steps with progressively larger diameters—the deeper they drill, the bigger the hole. Count the steps as you drill to achieve the proper size. These bits also deburr as they cut, so they're good for thin materials like sheet metal and plastic panels. Wear and heat resistant, high-speed steel is versatile for use on a range of materials.

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.

			Shank
Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Type	Size	Drill Bit Point Type	Mfr.		Each







			Black Oxide

			4.0, 5.0, 6.0, 6.5, 8.0, 9.0, 10.0, 11.0, 12.0	0.1575", 0.1969", 0.2362", 0.2559", 0.315", 0.3543", 0.3937", 0.4331", 0.4724"	65	Round/3-Flat	6.4 mm	Standard	Milwaukee	5910N19	000000


			4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20.0	0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874"	65	Round/3-Flat	6.4 mm	Standard	Milwaukee	5910N21	00000

High-Speed Steel Drill Bits

Jobbers' Length

Round Shank

Short Length

Round Shank


Split	Standard

Our basic drill bits are also the most versatile. Cut holes in a variety of metals, from the softest aluminum to the hardest steel.

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.

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.

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







				Black Oxide

				6.4	0.252"	101	50.2	Round	6.4 mm	Standard	Dormer Pramet	2958A98	00000




						Titanium Nitride (TiN) Coated

						6.4	0.252"	101	50.2	Round	6.4 mm	Standard	Dormer Pramet	8950A56	0000




								Black/Gold Oxide

								6.4	0.252"	105	69.9	Round	6.4 mm	Split	Viking Norseman Drill	30565A287	0000


								Short Length







												Black Oxide

												6.4	0.252"	70	31	Round	6.4 mm	Split	Dormer Pramet	28255A117	0000




														Titanium Nitride (TiN) Coated

														6.4	0.252"	70	16	Round	6.4 mm	Split	Dormer Pramet	2979N58	0000

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.

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.

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

				6.4	0.252"	101	63	Round	6.4 mm	Split	Chicago-Latrobe	5058N34	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						6.4	0.252"	101	63	Round	6.4 mm	Split	Chicago-Latrobe	2753A236	00000




								Gold Oxide

								6.4	0.252"	101	50.2	Round	6.4 mm	Split	Dormer Pramet	29355A97	0000


								Short Length







												Titanium Nitride (TiN) Coated

												6.4	0.252"	70	18.3	Round	6.4 mm	Split	Chicago-Latrobe	2456N155	00000




														Uncoated

														6.4	0.252"	70	18.3	Round	6.4 mm	Split	Chicago-Latrobe	2456N127	0000

Smooth-Finish Carbide Drill Bits


Jobbers' Length Round Shank	Split

With more cutting edges than other drill bits, these cut continuously and consistently for a smoother finish. They also stay centered to produce holes that are straighter and more accurate. However, since there’s less space between the cutting edges, they don’t clear chips as quickly. Made of carbide, these are the hardest and most wear-resistant drill bits you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. Carbide 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.

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

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







				Uncoated

				6.4	0.252"	70	31	Round	6.4 mm	Split	Kyocera	2783A44	000000

Drill Bits with Countersunk-Hole Guide

Quick-Change Hex Shank

Center holes perfectly before installing hinges, latches, and other hardware that require a countersunk screw. These bits have a built-in guide with a beveled tip that keeps the bit in position as it enters the material. So instead of measuring and marking, use your hardware as a template to drill the pilot holes. Once screws are installed, they're straight and the heads are flush. Also known as Vix bits, they're made of wear- and heat-resistant high-speed steel.

	Drill Bits										Replacement Bits
	Drill Bit Size, mm	Decimal Size Equiv.	For Screw Size	Overall Lg., mm	Max. Drilling Dp., mm	Shank Size, mm	Drill Bit Point Type	Mfr.		Each	Shank Size, mm		Each
Uncoated







				Quick-Change Hex Shank

				5	0.1968"	M5	98	12.1	6.4	Brad	Make It Snappy Tools	2869A91	000000	6.4	2869A92	00000

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

				6.4	0.252"	101	61	Parabolic	Round	6.4	Split	Viking Norseman Drill	2771N766	000000