R 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	Mfr.		Each	Pkg. Qty.		Pkg.
Jobbers' Length







				Black Oxide

				R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	Chicago-Latrobe	2901A162	000000	6	2901A552	000000




						Titanium Nitride (TiN) Coated

						R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	Chicago-Latrobe	3199A39	00000	—	———	0




								Titanium Aluminum Nitride (TiAlN) Coated

								R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	Chicago-Latrobe	3180A39	00000	—	———	0




										Uncoated

										R	0.339"	4 3/4"	2.92"	Round	0.339"	Standard	Viking Norseman Drill	30595A49	0000	6	30595A77	00000


										Short Length







														Black Oxide

														R	0.339"	3"	1"	Round	0.339"	Split	Dormer Pramet	2896A629	0000	—	———	0


														Extended Length







																		Black Oxide

																		R	0.339"	6 1/2"	3.61"	Round	0.339"	Standard	Chicago-Latrobe	3110A69	00000	—	———	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.

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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				R	0.339"	4 3/4"	3.44"	Round	0.339"	Split	Dormer Pramet	27995A857	000000




						Uncoated

						R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	Chicago-Latrobe	3069A69	00000


						Short Length







										Uncoated

										R	0.339"	3"	1.17"	Round	0.339"	Split	Chicago-Latrobe	28765A858	00000

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

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	Mfr.		Each
Extended Length







				Uncoated

				R	0.339"	12"	2.76"	Round	0.339"	Split	ICS	2854A479	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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				R	0.339"	4"	2.5"	Round	0.339"	Four Facet	Ultra Tool	29195A027	000000




						Uncoated

						R	0.339"	4"	2"	Round	0.339"	Four Facet	Ultra Tool	29195A49	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	Mfr.		Each
Jobbers' Length







				Uncoated

				R	0.339"	4 7/8"	3.19"	Parabolic	Round	0.339"	Split	Viking Norseman Drill	2771N29	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	Mfr.		Each
Jobbers' Length







				Uncoated

				R	0.339"	4 3/4"	2.8"	Round	0.339"	Standard	ICS	2940A528	000000


				R	0.339"	4 3/4"	2.9"	Round	0.339"	Split	ICS	31575A529	00000

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	Mfr.		Each
Short Length







				Uncoated

				R	0.339"	3"	1"	Round	0.339"	Four Facet	Ultra Tool	8944A659	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	Mfr.		Each
Uncoated



		R	0.339"	4 3/4"	2.62"	Round	0.339"	60°	Standard	ICS	27465A229	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	Mfr.		Each
Jobbers' Length







				Uncoated

				R	0.339"	4"	2"	Round	0.339"	140°	Brad	Fluted	Ultra Tool	2828A829	000000

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

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	Mfr.		Each
Jobbers' Length







				Uncoated

				R	0.339"	4"	2"	Round	0.339"	Split	Ultra Tool	2792A69	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



	R	0.3390"	3/4"	3/4"	3/32"	Steel	8865A207	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.	Dia. Tolerance	Drill Bit Size	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
0.339"	-0.0002" to 0"	R	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A201	00000

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
0.339"	-0.001" to 0.001"	R	Hot Rolled	Annealed	50,000	Precision Ground	Rockwell B95 (Medium)	Rockwell C65	ASTM A686	8890K239	000000	000000