101mm 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.

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







				Black Oxide

				6.2	0.2441"	101	50.6	Round	6.2 mm	Standard	2958A96	00000	00000


				6.3	0.248"	101	50.4	Round	6.3 mm	Standard	2958A97	0000	0000
				6.4	0.252"	101	50.2	Round	6.4 mm	Standard	2958A98	0000	0000
				6.5	0.2559"	101	50	Round	6.5 mm	Standard	2958A99	0000	0000
				6.6	0.2598"	101	49.8	Round	6.6 mm	Standard	2958A112	0000	0000
				6.7	0.2638"	101	49.6	Round	6.7 mm	Standard	2958A113	0000	0000




						Titanium Nitride (TiN) Coated

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


						6.5	0.2559"	101	50	Round	6.5 mm	Standard	8950A57	0000	0000
						6.7	0.2638"	101	49.6	Round	6.7 mm	Standard	8950A58	0000	0000

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.

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.

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







				Titanium Nitride (TiN) Coated

				6.1	0.2402"	101	63	Round	6.1 mm	Split	5058N133	000000


				6.2	0.2441"	101	63	Round	6.2 mm	Split	5058N134	00000
				6.3	0.248"	101	63	Round	6.3 mm	Split	5058N135	00000
				6.4	0.252"	101	63	Round	6.4 mm	Split	5058N34	0000
				6.6	0.2598"	101	63	Round	6.6 mm	Split	5058N35	00000




						Titanium Aluminum Nitride (TiAlN) Coated

						6.4	0.252"	101	63	Round	6.4 mm	Split	2753A236	00000


						6.5	0.2559"	101	53.3	Round	6.5 mm	Split	2753A174	00000
						6.6	0.2598"	101	63	Round	6.6 mm	Split	2753A237	00000
						6.7	0.2638"	101	63	Round	6.7 mm	Split	2753A238	00000




								Gold Oxide

								6.1	0.2402"	101	50.8	Round	6.1 mm	Split	29355A93	0000


								6.2	0.2441"	101	50.6	Round	6.2 mm	Split	29355A94	0000
								6.3	0.248"	101	50.4	Round	6.3 mm	Split	29355A96	0000
								6.4	0.252"	101	50.2	Round	6.4 mm	Split	29355A97	0000
								6.5	0.2559"	101	50	Round	6.5 mm	Split	29355A98	0000
								6.6	0.2598"	101	49.8	Round	6.6 mm	Split	29355A112	0000
								6.7	0.2638"	101	49.6	Round	6.7 mm	Split	29355A113	0000

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		Each
Jobbers' Length







				Uncoated

				6.1	0.2402"	101	61	Parabolic	Round	6.1	Split	2771N763	00000


				6.2	0.2441"	101	61	Parabolic	Round	6.2	Split	2771N764	0000
				6.3	0.248"	101	61	Parabolic	Round	6.3	Split	2771N765	0000
				6.4	0.252"	101	61	Parabolic	Round	6.4	Split	2771N766	0000
				6.6	0.2598"	101	61	Parabolic	Round	6.6	Split	2771N767	0000

Carbide Drill Bits

Jobbers' Length

Round Shank

The hardest and most wear-resistant drill bits you can buy. Carbide bits 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 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		Each
Jobbers' Length







				Uncoated

				8.5	0.3346"	101	63	Round	8.5 mm	Four Facet	3030A37	000000

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		Each
Jobbers' Length







				Titanium Aluminum Nitride (TiAlN) Coated

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

High-Speed Steel Drill Bits for Plastic

The precision-ground, 60° point penetrates gradually to prevent cracking and chipping. It also reduces heat that can deform the material. Use these bits for drilling into acrylic, laminate, and other plastics. They're made of wear-resistant high-speed steel.

Jobbers' Length About Jobbers' Length

					Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Point Angle	Drill Bit Point Type		Each
Uncoated



		6.5	0.2559"	101	72	Round	6.5	60°	Standard	27465A418	000000

Carbide Drill Bits for Carbon Fiber, Fiberglass, and Graphite

Jobbers' Length

Cut clean holes in abrasive material without fraying or delaminating the surface. Made of carbide, these bits resist wear to retain a sharp edge, even after after hundreds of cuts.

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







				Uncoated

				8.5	0.3346"	101	63	Round	8.5	140°	Brad	Fluted	2828A127	000000

Chip-Clearing High-Speed Steel Drill Bits


Jobbers' Length High Helix Flute Round Shank	Jobbers' Length Parabolic Flute Round Shank	Split

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.

Parabolic Flute—A U-shaped groove on the flutes cuts faster and clears chips more quickly than high-helix bits, so these are better for drilling deeper holes.

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

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.

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







				Black Oxide

				6.5	0.2559"	101	50	High Helix	Round	6.5	Split	30055A67	000000




						Uncoated

						6.5	0.2559"	101	50	Parabolic	Round	6.5	Split	2754A32	0000

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Standard

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.

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				Each
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type		1-9	10-Up
Jobbers' Length







				Black Oxide

				6.5	0.2559"	101	53.3	Round	6.5 mm	Standard	29855A64	000000	000000

Roughing Carbide Square End Mills

Serrations along the cutting edge act as chip breakers, so these end mills can remove large amounts of material at high speeds. Made of solid carbide, they are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the end mill from breaking. They have a square end for milling square slots, pockets, and edges. All are center cutting, allowing plunge cuts into a surface.

Titanium Nitride (TiN)-Coated Carbide—Titanium nitride (TiN)-coated end mills have good wear resistance.

Titanium Aluminum Nitride (TiAlN)-Coated Carbide—Titanium aluminum nitride (TiAlN)-coated end mills dissipate heat better than other end mills, especially at high speeds. At high temperatures, the coating creates a layer of aluminum oxide that transfers heat to the chips, keeping the tool cool, even when used without lubrication.

	Mill, mm
	Dia.	Dia. Tolerance	Shank Dia., mm	Lg. of Cut, mm	Overall Lg., mm	Flute Pitch	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Titanium Nitride (TiN)-Coated Carbide







				4 Flutes

				25	-0.089 to 0.0000	25	50	101	Coarse	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	87825A417	0000000


				Titanium Aluminum Nitride (TiAlN)-Coated Carbide







								4 Flutes

								25	-0.089 to 0.0000	25	50	101	Coarse	Equal	30°	Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	87825A425	000000