5 1/8" Long Drill Bits | McMaster-Carr

Extended Length—Drill through panels and thick workpieces with our longest bits. Their length is good for creating deep holes but makes them less rigid than other bits. As a result, they are more prone to wobbling or breaking, especially when drilling hard 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.

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 and titanium.

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	Pkg. Qty.		Pkg.
Jobbers' Length
Round Shank Standard Split






				Black Oxide

				25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Split	1	2901A134	000000


				25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Split	6	2901A585	00000
				W	0.386"	5 1/8"	3.17"	Round	0.386"	Split	1	2901A167	00000
				W	0.386"	5 1/8"	3.17"	Round	0.386"	Split	6	2901A556	00000
				X	0.397"	5 1/8"	3.15"	Round	0.397"	Split	1	2901A168	00000
				X	0.397"	5 1/8"	3.15"	Round	0.397"	Split	6	2901A557	00000




						Titanium Nitride (TiN) Coated

						25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Split	1	29115A734	00000


						25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Split	6	29115A834	00000
						W	0.386"	5 1/8"	3.17"	Round	0.386"	Split	1	3199A45	00000
						X	0.397"	5 1/8"	3.15"	Round	0.397"	Split	1	3199A46	00000




								Titanium Aluminum Nitride (TiAlN) Coated

								25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Split	1	3202A67	00000


								W	0.386"	5 1/8"	3.17"	Round	0.386"	Split	1	3180A45	00000
								X	0.397"	5 1/8"	3.15"	Round	0.397"	Split	1	3180A46	00000




										Uncoated

										25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Standard	1	8870A37	0000


										25/64"	0.3906"	5 1/8"	3.16"	Round	25/64"	Standard	6	8870A137	00000
										W	0.386"	5 1/8"	3.17"	Round	0.386"	Standard	1	30595A55	0000
										W	0.386"	5 1/8"	3.17"	Round	0.386"	Standard	6	30595A79	00000
										X	0.397"	5 1/8"	3.15"	Round	0.397"	Standard	1	30595A56	0000


										Extended Length
										Round Shank Standard






														Black Oxide

1/8"	0.125"													5 1/8"	2.56"	Round	1/8"	Standard	1	29315A121	0000


35 Ga.	0.11"													5 1/8"	2.58"	Round	0.11"	Standard	1	3096A348	00000
34 Ga.	0.111"	5 1/8"												2.58"	Round	0.111"	Standard	1	3096A347	00000
33 Ga.	0.113"	5 1/8"	2.58"											Round	0.113"	Standard	1	3096A346	00000
32 Ga.	0.116"	5 1/8"	2.57"											Round	0.116"	Standard	1	3096A345	00000
31 Ga.	0.12"	5 1/8"	2.57"											Round	0.12"	Standard	1	3096A344	00000




		Titanium Nitride (TiN) Coated

		1/8"	0.125"											5 1/8"	2.75"	Round	1/8"	Standard	1	28965A731	0000




				Uncoated

				1/8"	0.125"									5 1/8"	2.75"	Round	1/8"	Standard	1	2939A65	0000

Cobalt Steel Drill Bits

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






				Titanium Nitride (TiN) Coated

				25/64"	0.3906"	5 1/8"	3.75"	Round	25/64"	Split	27995A534	000000


				W	0.386"	5 1/8"	3.75"	Round	0.386"	Split	27995A863	00000
				X	0.397"	5 1/8"	3.75"	Round	0.397"	Split	27995A864	00000




						Uncoated

						25/64"	0.3906"	5 1/8"	2.67"	Hex	25/64"	Split	4909N25	00000


						25/64"	0.3906"	5 1/8"	3.1"	Round	25/64"	Split	3069A35	00000
						W	0.386"	5 1/8"	3.17"	Round	0.386"	Split	3069A75	00000
						X	0.397"	5 1/8"	3.15"	Round	0.397"	Split	3069A76	00000


						Extended Length
						Round Shank Split






										Uncoated

										1/8"	0.125"	5 1/8"	2.5"	Round	1/8"	Split	3063A115	00000


										35 Ga.	0.11"	5 1/8"	2.5"	Round	0.11"	Split	88555A75	00000
										34 Ga.	0.111"	5 1/8"	2.5"	Round	0.111"	Split	88555A74	00000
										33 Ga.	0.113"	5 1/8"	2.5"	Round	0.113"	Split	88555A73	00000
										32 Ga.	0.116"	5 1/8"	2.5"	Round	0.116"	Split	88555A72	00000
										31 Ga.	0.12"	5 1/8"	2.5"	Round	0.12"	Split	88555A71	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank

Extended Length

Round Shank


Standard	Split

Performance similar to solid carbide but at a lower price point. Like carbide bits, these are stronger than cobalt and high-speed steel and maintain their sharp edges when drilling abrasive material. However, when drilling tough metals like iron and hardened steel, upgrade to carbide for longer life.

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

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







				Uncoated

				25/64"	0.3906"	5 1/8"	3"	Round	25/64"	Standard	2940A32	000000


				25/64"	0.3906"	5 1/8"	3"	Round	25/64"	Split	31575A24	00000
				W	0.386"	5 1/8"	3"	Round	0.386"	Standard	2940A534	00000
				W	0.386"	5 1/8"	3.2"	Round	0.386"	Split	31575A535	00000
				X	0.397"	5 1/8"	3"	Round	0.397"	Standard	2940A535	00000
				X	0.397"	5 1/8"	3.2"	Round	0.397"	Split	31575A536	00000


				Extended Length







								Uncoated

								1/8"	0.125"	5 1/8"	2.44"	Round	1/8"	Standard	29465A11	00000

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



		25/64"	0.3906"	5 1/8"	3.75"	Round	25/64"	60°	Standard	27465A63	000000


		1/2"	0.5"	5 1/8"	2.63"	Round	1/4"	60°	Standard	27465A88	00000
		W	0.386"	5 1/8"	2.87"	Round	0.386"	60°	Standard	27465A235	00000
		X	0.397"	5 1/8"	2.87"	Round	0.397"	60°	Standard	27465A236	00000

Hollow-Core Cutter Arbor Adapters

Round

Shank

Pair these arbor adapters with hollow-core cutters when using a manual drill press or milling machine. Hollow-core cutters are also known as annular cutters.

	For Cutter Shank Size	Overall Lg.	For Cutter Material	Material		Each
Round Shank



	3/4"	3/4"	5 1/8"	Cobalt Steel, High-Speed Steel	High-Speed Steel	31315A254	0000000

Fast-Cutting Smooth-Finish Drill Bits for Wood

Quick-Change Hex Shank

Screw Point

Not only do these bits bore holes faster than standard smooth-finish bits, they create less friction and heat buildup to last longer. The spurred teeth have a long life, but they're less effective at guiding the bit so cuts on angled and overlapping holes tend to be rougher. Also known as multispur bits.

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 Size	Drill Bit Point Type		Each
Black Oxide







	Quick-Change Hex Shank

	1 3/4"	1.75"	5 1/8"	7/16"	Screw	3188A16	000000


	2"	2"	5 1/8"	7/16"	Screw	3188A17	00000
	2 1/8"	2.125"	5 1/8"	7/16"	Screw	3188A18	00000
	2 1/4"	2.25"	5 1/8"	7/16"	Screw	3188A19	00000
	2 9/16"	2.5625"	5 1/8"	7/16"	Screw	3188A21	00000

High-Speed Steel Precise-Cut Drill Bits for Wood

Wear and heat resistant, these stay sharp longer than precise-cut bits made of plain steel. The sharp center point keeps the bit from wandering during drilling to cut accurate straight and overlapping holes, even across the grain. Also known as brad-point bits.

	Max. Drilling Dp.	Shank Size	Drill Bit Point Type		Each
Uncoated







	Round Shank

	25/64"	0.3906"	5 1/8"	3 3/4"	3/8"	Brad	2926A121	000000

High-Speed Steel Drill Bits for Wood Screws

Achieve a perfect fit for wood screws with bits that match their exact thread size and diameter. Wear and heat resistant, they're good for soft and hard woods.

	Overall Lg.	Max. Drilling Dp.	Shank Size	Drill Bit Point Type		Each
Uncoated







	Round Shank

	1/8"	0.125"	No. 5	5 1/8"	2 3/4"	1/8"	Standard	30915A74	000000

Precise-Cut High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Standard

Produce holes so precise that you don’t need to finish them with a reamer. The double-edged flutes keep these bits centered to drill straighter and smoother than other types, especially in hard metals and composites such as fiberglass. Also known as double-margin drill 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.

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







				Titanium Nitride (TiN) Coated

				25/64"	0.3906"	5 1/8"	3.75"	Round	25/64"	Standard	3021A41	000000

Hole-Starting Cobalt Steel Drill Bits

120° Point Angle

Standard

Create an accurate starting place in your workpiece. Cut an indent with these bits, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Cobalt steel resists wear to stay sharp when cutting hard materials, such as nickel. Also known as spotting drill bits.

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

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

					Shank			90° Point Angle		120° Point Angle
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each		Each
Short Length







				Uncoated

				3/4"	0.75"	5 1/8"	1.63"	Round	3/4"	Standard	27445A17	000000	27445A27	000000

Anchor Installation Drill Bits for Masonry and Concrete

A built-in stop ensures the right drilling depth every time so drop-in anchors don't fall too far into the hole. These bits have a carbide tip that resists wear and heat to stay sharp.

SDS-Plus Shank for Hammer and Rotary Drilling

SDS-Plus

Shank

The slotted shank fits SDS-Plus-drive rotary hammers, which rotate and hammer bits simultaneously to penetrate material. Also known as percussion or impact bits.

	Max. Drilling Dp.	Specs. Met		Each
Uncoated







	Standard Point

	3/8"	0.375"	5 1/8"	1 1/16"	ANSI B212.15	2652N3	000000

Reduced-Shank High-Speed Steel Drill Bits

Jobbers' Length

Split

Cut large holes with drill presses and portable drills that have a standard-size chuck. The shank on these bits has a smaller diameter than the cutting tip. High-speed steel is good for general purpose drilling in most metals. Also known as Silver and Deming bits.

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







				Black Oxide

				25/64"	0.3906"	5 1/8"	3.75"	Reduced Round	3/8"	Split	8773A51	000000

Chip-Clearing High-Speed Steel Drill Bits


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

Standard

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.

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.	Flute Type	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Black Oxide

				25/64"	0.3906"	5 1/8"	2.96"	Parabolic	Round	25/64"	Split	29925A34	000000




						Titanium Nitride (TiN) Coated

						25/64"	0.3906"	5 1/8"	2.96"	Parabolic	Round	25/64"	Split	29925A74	00000




								Uncoated

								25/64"	0.3906"	5 1/8"	2.96"	Parabolic	Round	25/64"	Split	2754A64	00000


								25/64"	0.3906"	5 1/8"	3.16"	High Helix	Round	25/64"	Standard	2912A134	00000

Countersink Drill Bits for Screws

Also known as step drill bits, these bits countersink as they drill. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws. After multiple sharpenings, the drill bit diameter may become smaller.

		Dia.		Lg.						82° Countersink Angle
	For Screw Size	Body	Step	Step	Overall	Shank Dia.	Point Angle	For Use On	Mfr.		Each
Uncoated High-Speed Steel







				2 Flutes

				No. 10	0.386"	0.196"	5/8"	5 1/8"	0.3860"	118°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Republic Drill	8914A53	000000

Short-Flute Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Split

These bits combine the toughness and wear resistance of cobalt with short flutes for rigidity. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter. Cobalt lasts at least twice as long as high-speed steel. It can also run up to 25% faster at higher temperatures without damaging the bit on hard materials such as nickel.

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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-4	5-Up
Jobbers' Length







				Black Oxide

				25/64"	0.3906"	5 1/8"	1.29"	Round	25/64"	Split	3146A135	000000	000000

Chip-Clearing High-Speed Steel Drill Bits for Aluminum, Brass, and Bronze

Jobbers' Length

Low Helix Flute

Round Shank

Standard

Designed for soft metals that can gum up other drill bits, wide flutes lift chips out of the hole. This prevents clogs that can weaken and damage the bit and ruin the hole. Also known as slow spiral bits, these are made of versatile high-speed steel.

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				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type		1-5	6-Up
Jobbers' Length







				Uncoated

				25/64"	0.3906"	5 1/8"	2.96"	Low Helix	Round	25/64"	Standard	2928A234	000000	000000

Oversized Long-Life Counterbore Drill Bits

These counterbores are often used when screw holes in sheets or layers are misaligned. Also known as subland drill bits, they last longer than standard counterbore drill bits because the diameter stays the same after sharpening. They drill and counterbore at the same time. After drilling and counterboring, tap the hole and install your fastener. The diameters account for the _1/32” or _1/64” oversized diameter rating.

		Dia.		Lg.
	For Screw Size	Body	Step	Step	Overall	No. of Flutes	Point Angle	For Use On	Mfr.		Each
Uncoated High-Speed Steel







				1/64" Oversize

				1/4"	0.391"	0.266"	1/2"	5 1/8"	2	118°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	RTS Cutting Tools	29525A54	000000

Ball-End Driver Shafts


		Hex

Create your own tool by attaching these shafts to a handle, or use with socket wrenches and power tools. They have a ball end that allows angled entry to make good contact with the recess when a standard-tip shaft can’t.

Driver Extension Adapters—Create a tool that’s as long as you need. Attach a driver shaft to a screwdriver, T-handle key, or L-key to extend your reach, or chain multiple shafts together to reach deeply recessed fasteners.

	Driver Shafts						Driver Extension Adapters
	Drive Size	Overall Lg.	Max. Access Angle	Material		Each		Each
For Hex Drives



		5/32"	5 1/8"	25°	Black Phosphate-Coated Steel	6972A21	00000	9761N18	000000

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.

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				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-5	6-Up
Jobbers' Length







				Uncoated

				25/64"	0.3906"	5 1/8"	2.96"	Round	25/64"	Split	2876A361	000000	000000

High-Speed Steel Square End Mills

4 Flutes

Use these end mills for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. They have a square end for milling square slots, pockets, and edges.

End mills with fewer flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts; end mills with more flutes provide a finer finish and operate with less vibration when run at high speeds.

Uncoated High-Speed Steel—Use uncoated end mills for general purpose milling and short production runs.

Titanium Nitride (TiN)-Coated High-Speed Steel—Use titanium nitride (TiN)-coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. They’re more wear resistant than uncoated end mills, which means they last longer when run at similar speeds.

Center Cutting—Center-cutting end mills allow plunge cuts into a surface.

	Mill
	Dia.	Dia. Tolerance	Shank Dia.	Lg. of Cut	Overall Lg.	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Uncoated High-Speed Steel







				4 Flutes

				11/16"	0.000" to 0.0015"	5/8"	3"	5 1/8"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	3056A51	000000


				Titanium Nitride (TiN)-Coated High-Speed Steel







								4 Flutes

								11/16"	0.000" to 0.0015"	5/8"	3"	5 1/8"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Steel, Tool Steel	Center Cutting	Square	8918A139	00000