4 3/4" Long Drill Bits | McMaster-Carr

Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ 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.

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.

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—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

				11/32"	0.3438"	4 3/4"	2.92"	Round	11/32"	Split	2901A131	00000	6	2901A582	000000


				Q	0.332"	4 3/4"	2.94"	Round	0.332"	Split	2901A161	0000	6	2901A551	00000
				R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	2901A162	0000	6	2901A552	00000




						Titanium Nitride (TiN) Coated

						11/32"	0.3438"	4 3/4"	2.92"	Round	11/32"	Split	29115A731	00000	6	29115A831	00000


						Q	0.332"	4 3/4"	2.94"	Round	0.332"	Split	3199A38	00000	—	———	0
						R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	3199A39	00000	—	———	0




								Titanium Aluminum Nitride (TiAlN) Coated

								11/32"	0.3438"	4 3/4"	2.92"	Round	11/32"	Split	3202A64	00000	—	———	0


								Q	0.332"	4 3/4"	2.94"	Round	0.332"	Split	3180A38	00000	—	———	0
								R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	3180A39	00000	—	———	0




										Uncoated

										11/32"	0.3438"	4 3/4"	2.92"	Round	11/32"	Standard	8870A34	0000	6	8870A134	00000


										Q	0.332"	4 3/4"	2.94"	Round	0.332"	Standard	30595A48	0000	6	30595A76	00000
										R	0.339"	4 3/4"	2.92"	Round	0.339"	Standard	30595A49	0000	6	30595A77	00000


										Short Length







														Uncoated

														23/32"	0.7188"	4 3/4"	1.92"	Round	23/32"	Standard	8947A254	00000	—	———	0


														Maintenance Length







			Gold Oxide

			15/32"												0.4688"	4 3/4"	3"	Round/3-Flat	15/32"	Split	87755A49	00000	—	———	0

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Jobbers' Length

Hex 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.

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

				11/32"	0.3438"	4 3/4"	3.44"	Round	11/32"	Split	27995A531	000000


				Q	0.332"	4 3/4"	3.44"	Round	0.332"	Split	27995A856	00000
				R	0.339"	4 3/4"	3.44"	Round	0.339"	Split	27995A857	00000




						Uncoated

						11/32"	0.3438"	4 3/4"	2.39"	Hex	11/32"	Split	4909N22	00000


						11/32"	0.3438"	4 3/4"	2.9"	Round	11/32"	Split	3069A32	00000
						Q	0.332"	4 3/4"	2.94"	Round	0.332"	Split	3069A68	00000
						R	0.339"	4 3/4"	2.92"	Round	0.339"	Split	3069A69	00000

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.

Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.

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

				29/64"	0.4531"	4 3/4"	2.4"	Round	29/64"	Four Facet	27515A62	0000000


				15/32"	0.4688"	4 3/4"	2.4"	Round	15/32"	Four Facet	27515A63	000000
				1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	Four Facet	27515A56	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						29/64"	0.4531"	4 3/4"	2.4"	Round	29/64"	Four Facet	8879A92	000000


						15/32"	0.4688"	4 3/4"	2.4"	Round	15/32"	Four Facet	8879A93	000000
						1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	Four Facet	8879A73	000000




								Uncoated

								29/64"	0.4531"	4 3/4"	2.4"	Round	29/64"	Four Facet	2956A38	000000


								15/32"	0.4688"	4 3/4"	2.4"	Round	15/32"	Four Facet	2956A39	000000
								1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	Four Facet	2956A42	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

				1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	Split	3171A53	0000000


				33/64"	0.5156"	4 3/4"	3"	Round	33/64"	Split	3171A54	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







				Diamond Coated

				1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	118°	Split	Fluted	3162A35	0000000




						Uncoated

						29/64"	0.4531"	4 3/4"	2.4"	Round	29/64"	140°	Brad	Fluted	2828A27	000000


						15/32"	0.4688"	4 3/4"	2.4"	Round	15/32"	140°	Brad	Fluted	2828A28	000000
						31/64"	0.4844"	4 3/4"	2.4"	Round	31/64"	140°	Brad	Fluted	2828A29	000000
						1/2"	0.5"	4 3/4"	2.4"	Round	1/2"	140°	Brad	Fluted	2828A79	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



		11/32"	0.3438"	4 3/4"	3.44"	Round	11/32"	60°	Standard	27465A61	000000


		7/16"	0.4375"	4 3/4"	2.5"	Round	1/4"	60°	Standard	27465A87	00000
		Q	0.332"	4 3/4"	2.62"	Round	0.332"	60°	Standard	27465A228	00000
		R	0.339"	4 3/4"	2.62"	Round	0.339"	60°	Standard	27465A229	00000

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

				11/32"	0.3438"	4 3/4"	2.8"	Round	11/32"	Standard	2940A28	000000


				11/32"	0.3438"	4 3/4"	2.8"	Round	11/32"	Split	31575A22	00000
				Q	0.332"	4 3/4"	2.8"	Round	0.332"	Standard	2940A527	00000
				Q	0.332"	4 3/4"	2.9"	Round	0.332"	Split	31575A528	00000
				R	0.339"	4 3/4"	2.8"	Round	0.339"	Standard	2940A528	00000
				R	0.339"	4 3/4"	2.9"	Round	0.339"	Split	31575A529	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

	11/32"	0.3438"	4 3/4"	3.44"	3/8"	Brad	2926A118	000000

Reduced-Shank High-Speed Steel Drill Bits

Jobbers' Length

Standard

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

				7/16"	0.4375"	4 3/4"	2.94"	Reduced Round	1/4"	Standard	3038A23	000000


				29/64"	0.4531"	4 3/4"	3.03"	Reduced Round	1/4"	Standard	3038A24	00000

Carbide-Tipped Drill Bits for Hardened Steel

Jobbers' Length

Round Shank

Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits. A lower-priced alternative to solid carbide, they stay sharp when drilling abrasive material but won’t last as long.

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

				21/64"	0.3281"	4 3/4"	1.31"	Round	21/64"	Notched	2973A29	000000


				11/32"	0.3438"	4 3/4"	1.37"	Round	11/32"	Notched	2973A31	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. 8	0.332"	0.169"	1/2"	4 3/4"	0.3320"	118°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Republic Drill	8914A52	000000

Left-Hand Cobalt Steel Drill Bits

Maintenance Length

Round Shank

Split

The flutes spiral in the opposite direction of other bits and stay sharp longer than high-speed steel. They’re 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.

Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ bits.

Uncoated—Polished to eject chips, these are 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
Maintenance Length







				Uncoated

				15/32"	0.4688"	4 3/4"	2.23"	Round	15/32"	Split	3474A26	000000	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"	4 3/4"	11/16"	ANSI B212.15	2652N2	000000

Coolant-Fed Carbide Drill Bits

Jobbers' Length

Round Shank

The hardest and most wear-resistant bits, these deliver coolant to reduce heat and evacuate chips. They are designed for CNC machines that supply coolant through the spindle rather than an external source, such as a hose and nozzle. Coolant flows directly from holes in the bit's tip onto the drilling surface. This speeds up cuts and leads to excellent performance in deep holes and tough materials such as stainless steel and titanium.

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







				Titanium Aluminum Nitride (TiAlN) Coated

				7/16"	0.4375"	4 3/4"	2.81"	Round	7/16"	Four Facet	2396N539	0000000

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

				11/32"	0.3438"	4 3/4"	2.74"	Parabolic	Round	11/32"	Split	29925A31	000000




						Titanium Nitride (TiN) Coated

						11/32"	0.3438"	4 3/4"	2.74"	Parabolic	Round	11/32"	Split	29925A71	00000




								Uncoated

								11/32"	0.3438"	4 3/4"	2.74"	Parabolic	Round	11/32"	Split	2754A61	00000


								11/32"	0.3438"	4 3/4"	2.92"	High Helix	Round	11/32"	Standard	2912A131	00000

Carbide-Tipped Drill Bits for Masonry and Concrete

Crush rather than cut material so bits don’t jam or overheat while drilling masonry and concrete. The ultra-hard carbide tip breaks masonry into pieces and the widely spaced flutes channel them out of the hole. These bits stay sharp, resisting wear and heat that will dull or break other bits.

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

	7/32"	0.2188"	4 3/4"	2.5"	ANSI B212.15	8948A55	00000

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

				11/32"	0.3438"	4 3/4"	1.17"	Round	11/32"	Split	3146A132	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
0.332"	-0.0002" to 0"	Q	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A199	00000
0.339"	-0.0002" to 0"	R	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A201	0000
0.3438"	-0.0002" to 0"	11/32"	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A134	0000
8.4 mm	-0.005 mm to 0 mm	8.4 mm	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A363	0000
8.5 mm	-0.005 mm to 0 mm	8.5 mm	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A364	0000
8.6 mm	-0.005 mm to 0 mm	8.6 mm	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A365	0000
8.7 mm	-0.005 mm to 0 mm	8.7 mm	4 3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A366	0000

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

				11/32"	0.3438"	4 3/4"	2.75"	Low Helix	Round	11/32"	Standard	2928A231	000000	000000

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


		7/16"-20	1 1/4"	4 3/4"	25/64"	0.3906"	118°	Spiral	2	UNF	H3	1/4"	3464A62	00000


		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


				7/16"-20	1 1/4"	4 3/4"	25/64"	0.3906"	118°	Spiral	2	UNF	H3	1/4"	3464A123	00000

Counterbore Drill Bits

Often called step drill bits, these drill and counterbore holes at the same time. After drilling and counterboring, tap the hole and install your fastener. The body diameter may decrease after multiple sharpenings.

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



		No. 10	0.332"	0.204"	5/8"	4 3/4"	118°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Republic Drill	8914A33	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

				No. 10	0.344"	0.206"	1/2"	4 3/4"	2	118°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	RTS Cutting Tools	29525A51	000000

Tight-Tolerance Ultra-Heat-Resistant M42 High-Speed Tool Steel Rods

Machine saw blades, end mills, and other cutting tools that stay hard and sharp at top speeds and temperatures. M42 runs faster and hotter than other grades of high-speed tool steel, so it slices through material as tough as titanium without softening or wearing down. Precision ground and held to a strict tightness tolerance, this steel is all set to turn in your lathe. Also known as cobalt steel.

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

Dia.	Dia. Tolerance	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
11/32"	-0.0002" to 0"	4 3/4"	Not Rated	Rockwell C65 (Extra Hard)	Precision Ground	8813A64	000000

Cobalt Steel Ball End Mills


Ball Cut Style	2 Flutes

With better heat and wear resistance than high-speed steel, these cobalt steel end mills can run at higher speeds and provide better performance on hard material, such as iron, hardened steel, titanium, and tool steel. They have a ball end for milling rounded slots, slopes, and contours. All are center cutting, allowing plunge cuts into a surface.

2 Flutes—End mills with two flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts.

	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 Cobalt Steel







				2 Flutes

				1"	0" to 0.0011"	1"	2 1/4"	4 3/4"	Equal	30°	Aluminum, Brass, Bronze, Copper, Hardened Steel, Iron, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Ball	8174N37	0000000


				1 1/8"	0" to 0.0011"	1"	2 1/4"	4 3/4"	Equal	30°	Aluminum, Brass, Bronze, Copper, Hardened Steel, Iron, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Ball	8174N39	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

				11/32"	0.3438"	4 3/4"	2.74"	Round	11/32"	Split	2876A331	000000	000000

High-Speed Steel Ball End Mills


Ball Cut Style	2 Flutes

Use these end mills for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. They have a ball end for milling rounded slots, slopes, and contours. All are center cutting, allowing plunge cuts into a surface.

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.

2 Flutes—End mills with two flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts.

	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







				2 Flutes

				1"	0.000" to 0.003"	1"	2 1/4"	4 3/4"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Ball	3046A23	0000000


				Titanium Nitride (TiN)-Coated High-Speed Steel







								2 Flutes

								1"	0.000" to 0.003"	1"	2 1/4"	4 3/4"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Tool Steel	Center Cutting	Ball	8900A61	000000

High-Speed Steel Corner-Rounding End Mills

Corner-Rounding Cut

Style

Use these versatile end mills for milling in most material, including aluminum, brass, bronze, iron, and steel. They have scooped corners for rounding the sharp edges of your workpiece.

Uncoated High-Speed Steel—Use uncoated end mills for general purpose milling and short production runs. They stay sharper than coated end mills when used on soft materials like aluminum, leaving a better finish.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium nitride (TiN)-coated end mills create less friction than uncoated end mills, which means they last longer when run at similar speeds. Use coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. The coating reduces friction and vibration as they’re used, making them more wear resistant than uncoated end mills.

Aluminum Titanium Nitride (ALTiN)-Coated High-Speed Steel—Aluminum titanium nitride (AlTiN)-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. Use coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. The coating reduces friction and vibration as they’re used, making them more wear resistant than uncoated end mills.

									Uncoated High-Speed Steel		Titanium Nitride (TiN)-Coated High-Speed Steel		Aluminum Titanium Nitride (ALTiN)-Coated High-Speed Steel
	Cut Radius	Tip Dia.	Mill Dia.	Shank Dia.	Overall Lg.	Flute Spacing	For Use On	Cut Style		Each		Each		Each
4 Flutes



		1"	5/8"	2 3/4"	1"	4 3/4"	Equal	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Corner Rounding	3067A42	0000000	8375N35	0000000	8412N35	0000000

Oversized Hardened Multipurpose M2 High-Speed Tool Steel Rods

Also known as reamer blanks, these rods have an oversized diameter that allows for finishing to your exact requirements. 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	Reamer Size	Lg.	Fabrication	Yield Strength	Hardness	Mechanical Finish		Each
0.332"	0" to 0.0002"	Q	4 3/4"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A299	00000
0.339"	0" to 0.0002"	R	4 3/4"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A301	0000
0.3438"	0" to 0.0002"	11/32"	4 3/4"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A234	0000