4 7/8" 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
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Pkg. Qty.		Pkg.
Jobbers' Length







				Black Oxide

				23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Split	1	2901A132	00000


				23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Split	6	2901A583	00000
				S	0.348"	4 7/8"	2.97"	Round	0.348"	Split	1	2901A163	00000
				S	0.348"	4 7/8"	2.97"	Round	0.348"	Split	6	2901A553	00000
				T	0.358"	4 7/8"	2.96"	Round	0.358"	Split	1	2901A164	00000




						Titanium Nitride (TiN) Coated

						23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Split	1	29115A732	00000


						23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Split	6	29115A832	00000
						S	0.348"	4 7/8"	2.97"	Round	0.348"	Split	1	3199A41	00000
						T	0.358"	4 7/8"	2.96"	Round	0.358"	Split	1	3199A42	00000




								Titanium Aluminum Nitride (TiAlN) Coated

								23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Split	1	3202A65	00000


								S	0.348"	4 7/8"	2.97"	Round	0.348"	Split	1	3180A41	00000
								T	0.358"	4 7/8"	2.96"	Round	0.358"	Split	1	3180A42	00000




										Uncoated

										23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Standard	1	8870A35	0000


										23/64"	0.3594"	4 7/8"	2.96"	Round	23/64"	Standard	6	8870A135	00000
										S	0.348"	4 7/8"	2.97"	Round	0.348"	Standard	1	30595A51	0000
										S	0.348"	4 7/8"	2.97"	Round	0.348"	Standard	6	30595A78	00000
										T	0.358"	4 7/8"	2.96"	Round	0.358"	Standard	1	30595A52	0000


										Maintenance Length







														Gold Oxide

31/64"														0.4844"	4 7/8"	3.21"	Round/3-Flat	31/64"	Split	1	87755A51	00000

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

				23/64"	0.3594"	4 7/8"	3.5"	Round	23/64"	Split	27995A532	000000


				S	0.348"	4 7/8"	3.5"	Round	0.348"	Split	27995A858	00000
				T	0.358"	4 7/8"	3.5"	Round	0.358"	Split	27995A859	00000




						Titanium Aluminum Nitride (TiAlN) Coated

						11/32"	0.3438"	4 7/8"	2.67"	Round	11/32"	Split	2753A143	00000


						23/64"	0.3594"	4 7/8"	3.5"	Round	23/64"	Split	3069A94	00000




								Uncoated

								23/64"	0.3594"	4 7/8"	2.48"	Hex	23/64"	Split	4909N23	00000


								23/64"	0.3594"	4 7/8"	2.9"	Round	23/64"	Split	3069A33	00000
								S	0.348"	4 7/8"	2.97"	Round	0.348"	Split	3069A71	00000
								T	0.358"	4 7/8"	2.96"	Round	0.358"	Split	3069A72	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.

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







				Titanium Nitride (TiN) Coated

				11/32"	0.3438"	4 7/8"	3.1"	Parabolic	Round	11/32"	Split	3183A61	000000


				23/64"	0.3594"	4 7/8"	3.1"	Parabolic	Round	23/64"	Split	3183A62	00000




						Uncoated

						11/32"	0.3438"	4 7/8"	3.1"	Parabolic	Round	11/32"	Split	29925A931	00000


						23/64"	0.3594"	4 7/8"	3.1"	Parabolic	Round	23/64"	Split	29925A932	00000
						R	0.339"	4 7/8"	3.19"	Parabolic	Round	0.339"	Split	2771N29	00000
						S	0.348"	4 7/8"	3.19"	Parabolic	Round	0.348"	Split	2771N31	00000
						T	0.358"	4 7/8"	3.19"	Parabolic	Round	0.358"	Split	2771N32	00000
						U	0.368"	4 7/8"	3.19"	Parabolic	Round	0.368"	Split	2771N33	00000
						V	0.377"	4 7/8"	3.43"	Parabolic	Round	0.377"	Split	2771N34	00000

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

	1/4"	0.25"	4 7/8"	13/16"	ANSI B212.15	2652N1	000000


	1/2"	0.5"	4 7/8"	13/16"	ANSI B212.15	2652N4	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

				23/64"	0.3594"	4 7/8"	2.9"	Round	23/64"	Standard	2940A29	000000


				23/64"	0.3594"	4 7/8"	2.9"	Round	23/64"	Split	31575A36	00000
				S	0.348"	4 7/8"	2.9"	Round	0.348"	Standard	2940A529	00000
				S	0.348"	4 7/8"	3"	Round	0.348"	Split	31575A531	00000
				T	0.358"	4 7/8"	2.9"	Round	0.358"	Standard	2940A531	00000
				T	0.358"	4 7/8"	3"	Round	0.358"	Split	31575A532	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



		23/64"	0.3594"	4 7/8"	3.5"	Round	23/64"	60°	Standard	27465A62	000000


		S	0.348"	4 7/8"	2.62"	Round	0.348"	60°	Standard	27465A231	00000
		T	0.358"	4 7/8"	2.62"	Round	0.358"	60°	Standard	27465A232	00000

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

				15/32"	0.4688"	4 7/8"	3.13"	Reduced Round	1/4"	Standard	3038A25	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

				23/64"	0.3594"	4 7/8"	1.21"	Round	23/64"	Split	3146A133	000000	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.

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 7/8"	2.49"	High Helix	Round	11/32"	Split	31115A61	00000


				23/64"	0.3594"	4 7/8"	2.46"	High Helix	Round	23/64"	Split	31115A62	00000
				23/64"	0.3594"	4 7/8"	2.78"	Parabolic	Round	23/64"	Split	29925A32	00000




						Titanium Nitride (TiN) Coated

						23/64"	0.3594"	4 7/8"	2.78"	Parabolic	Round	23/64"	Split	29925A72	00000




								Uncoated

								23/64"	0.3594"	4 7/8"	2.78"	Parabolic	Round	23/64"	Split	2754A62	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
0.348"	-0.0002" to 0"	S	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A202	00000
0.358"	-0.0002" to 0"	T	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A203	0000
0.3594"	-0.0002" to 0"	23/64"	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A135	0000
8.8 mm	-0.005 mm to 0 mm	8.8 mm	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A367	0000
8.9 mm	-0.005 mm to 0 mm	8.9 mm	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A368	0000
9 mm	-0.005 mm to 0 mm	9 mm	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A369	00000
9.1 mm	-0.005 mm to 0 mm	9.1 mm	4 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A371	00000

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

				23/64"	0.3594"	4 7/8"	2.78"	Low Helix	Round	23/64"	Standard	2928A232	000000	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

				23/64"	0.3594"	4 7/8"	2.78"	Round	23/64"	Split	2876A341	000000	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
23/64"	-0.0002" to 0"	4 7/8"	Not Rated	Rockwell C65 (Extra Hard)	Precision Ground	8813A66	000000

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
0.348"	0" to 0.0002"	S	4 7/8"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A302	00000
0.358"	0" to 0.0002"	T	4 7/8"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A303	0000
0.3594"	0" to 0.0002"	23/64"	4 7/8"	Hot Rolled	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3023A235	0000