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







				Black Oxide

				U	0.368"	5"	3.07"	Round	0.368"	Split	2901A165	000000	6	2901A554	000000




						Titanium Nitride (TiN) Coated

						U	0.368"	5"	3.07"	Round	0.368"	Split	3199A43	00000	—	———	0




								Titanium Aluminum Nitride (TiAlN) Coated

								U	0.368"	5"	3.07"	Round	0.368"	Split	3180A43	00000	—	———	0




										Uncoated

										U	0.368"	5"	3.07"	Round	0.368"	Standard	30595A53	0000	—	———	0


										Short Length







														Black Oxide

														U	0.368"	3 1/8"	1.07"	Round	0.368"	Split	2896A633	0000	—	———	0


														Extended Length







																		Black Oxide

																		U	0.368"	6 3/4"	3.69"	Round	0.368"	Standard	3110A73	00000	—	———	0

Chip-Clearing Tap and Drill Bit Sets for Through Holes

Also known as gun taps, the taps in these sets have spiral-point flutes that push chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent buildup, they produce threads more efficiently than standard taps and are suitable for production work. Taps have a square shank for compatibility with tap wrenches and tap holders for drill presses and milling machines. With a plug chamfer, they have 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. All taps and drill bits are made of high-speed steel for use on most metal and plastic.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
Uncoated High-Speed Steel Tap



	18	Plug	6-32 8-32 10-24 10-32 1/4"-20 5/16"-18 3/8"-16 7/16"-14 1/2"-13	2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 5/32" 3 3/8"	UNC, UNF	2, 3	H3	27/64" 5/16" 36 ga. 29 ga. 25 ga. 21 ga. 7 ga. F U	Black-Oxide High-Speed Steel	Metal Case	27275A27	0000000

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.

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







				Titanium Nitride (TiN) Coated

				U	0.368"	5"	3.63"	Round	0.368"	Split	27995A861	000000




						Uncoated

						U	0.368"	5"	3.07"	Round	0.368"	Split	3069A73	00000


						Short Length







										Uncoated

										U	0.368"	3 1/8"	1.26"	Round	0.368"	Split	28765A861	00000

Tap and Drill Bit Cases

For Drill Bits

Steel

Store and organize drill bits so they stay in good working condition and don't go missing. These cases have individually marked holes for each size in your set.

Steel—Steel cases have stands that fold in and out. Stand them up when you need them, then fold them back into the slim case for storage inside a workbench drawer.

		For Drill Bit		Overall
	Material	No. of	Size	Lg.	Wd.	Ht.		Each
For Inch, Wire Gauge, Letter Size Drill Bits







				For Jobbers' Length

				Steel	19	1/16", 1/2", 1/4", 1/8", 21 Ga., 25 Ga., 37/64", 29 Ga., 3/16", 3/32", 3/8", 5/16", 5/32", 5/64", 7 Ga., 7/16", 7/32", F, U	7"	4"	1 1/4"	2961A43	000000

Drill Bit Size Gauges

For

Letter

Size

Measure drill bit sizes with these gauges.

For System of Measurement	For Use With	For Drill Bit Size	Wd.	Ht.	Thk.	Material	Color	Mounting Hole Dia.		Each
Letter Size	Drills	A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	8986A65	000000

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.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated bits, especially on materials like hardened steel, iron, and stainless steel.

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

					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

				U	0.368"	4 1/4"	2.75"	Round	0.368"	Four Facet	29195A029	000000




						Uncoated

						U	0.368"	4 1/4"	2.2"	Round	0.368"	Four Facet	29195A53	00000

Short-Flute Carbide-Tipped Drill Bits

Extended Length

Round Shank

Split

Our strongest short-flute bits, these have a carbide tip that stays sharp when drilling abrasive materials, such as titanium. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter.

Extended Length—Drill through panels and thick workpieces with our longest bits.

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







				Uncoated

				U	0.368"	12"	2.89"	Round	0.368"	Split	2854A483	000000

Carbide-Tipped Drill Bits

Jobbers' 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

				U	0.368"	5"	2.9"	Round	0.368"	Standard	2940A532	000000


				U	0.368"	5"	3.1"	Round	0.368"	Split	31575A533	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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				U	0.368"	4 7/8"	3.19"	Parabolic	Round	0.368"	Split	2771N33	000000

Carbide Drill Bits for Hardened Steel

Short Length

Round Shank

The hardest and most wear-resistant bits with the longest life. Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits. Carbide stays sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. It 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.

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

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

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







				Uncoated

				U	0.368"	3"	1"	Round	0.368"	Four Facet	8944A663	000000

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







				Uncoated

				U	0.368"	4 1/4"	2.2"	Round	0.368"	Split	2792A73	0000000

Tapping Threaded Insert Assortments for Soft Metal

Cut a variety of thread sizes into aluminum and other soft metal—no taps required. These inserts cut their own threads and lock into material, so they won’t budge when you install or remove a screw. To install inserts with a wrench, thread an insert and two hex nuts onto a bolt. Then, grip and turn the top nut to drive into a drilled hole. If you need to add a lot of threaded connections quickly, use an installation tool (not included) with a ratchet wrench or drill press. These inserts are comparable to Tap-Lok inserts.

Zinc-Plated Steel—A step up from plain steel, the plating withstands occasional exposure to moisture.

	Includes	Drill Bit Size	For Max. Hole Dia.		Each
Zinc-Plated Steel



	40	Drill Bits M6x1.0 mm Thread x 12 mm Installed Lg. (10 Each) M8x1.25 mm Thread x 14 mm Installed Lg. (10 Each) M10x1.5 mm Thread x 18 mm Installed Lg. (10 Each) M12x1.75 mm Thread x 22 mm Installed Lg. (10 Each)	7/16" 33/64" L U	0.290" 0.368" 0.438" 0.516"	93491A140	0000000


	50	1/2"-13 Thread x 0.945" Installed Lg. (10 each) 1/4"-20 Thread x 0.472" Installed Lg. (10 Each) 3/8"-16 Thread x 0.709" Installed Lg. (10 Each) 5/16"-18 Thread x 0.551" Installed Lg. (10 Each) 7/16"-14 Thread x 0.866" Installed Lg. (10 Each) Drill Bits	7/16" 33/64" 19/32" L U	0.290" 0.368" 0.438" 0.516" 0.594"	93491A130	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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Angle	Drill Bit Point Type		Each
Uncoated



		U	0.368"	5"	2.75"	Round	0.368"	60°	Standard	27465A233	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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Angle	Drill Bit Point Type	Bit Style		Each
Jobbers' Length







				Uncoated

				U	0.368"	4 1/4"	2.2"	Round	0.368"	140°	Brad	Fluted	2828A833	0000000

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	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit	Hex Shank Size		Each
Uncoated High-Speed Steel



		7/16"-14	1 1/4"	4 3/4"	U	0.368"	118°	Spiral	2	UNC	H3	1/4"	3464A61	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				7/16"-14	1 1/4"	4 3/4"	U	0.368"	118°	Spiral	2	UNC	H3	1/4"	3464A122	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.

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	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel



		7/16"-14	1 1/4"	3 3/4"	U	0.368"	110°	Spiral	2	UNC	H3	2748A49	000000

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 Letter Size Drill Bits



	U	0.3680"	3/4"	3/4"	3/32"	Steel	8865A214	00000

M2 High-Speed Tool Steel Rod Sets

Supplied in a metal index case with fold-out panels, these rods, also known as drill blanks, have an undersized diameter for machining your own jobbers'-length drill bits. They are 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.

Includes	No. of Pieces	Dia. Tolerance	Mechanical Finish		Each
Sizes A-Z and a metal index case	26	-0.0002" to 0"	Precision Ground	2952A8	0000000

Tight-Tolerance Water-Hardening W1 Tool Steel Rods

Ready for turning in your lathe, these rods are precision ground and held to strict diameter and straightness tolerances. Also known as drill rod. With far less alloy content than other tool steel, W1 is the most machinable we offer. These rods are often used to make hammers, files, and reamers—tools that don't require the dimensional stability of A2 or O1. These rods are also decarb-free, which means any surface flaws created during the manufacturing process have been removed. This makes them even more machinable and leads to better results from heat treating or finishing. Heat treat the surface for extra wear resistance. Or, quench this steel in water to boost its hardness and strength, giving it a sharper, more durable edge for small tools.

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

Dia.	Dia. Tolerance	Drill Bit Size	Fabrication	Heat Treatment	Yield Strength, psi	Mechanical Finish	Hardness	Max. Hardness After Heat Treatment	Specs. Met		3 ft. Long	6 ft. Long
0.368"	-0.001" to 0.001"	U	Hot Rolled	Annealed	50,000	Precision Ground	Rockwell B95 (Medium)	Rockwell C65	ASTM A686	8890K246	000000	000000

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.	Dia. Tolerance	Drill Bit Size	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
0.368"	-0.0002" to 0"	U	5"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A204	000000