151mm Long Drill Bits | McMaster-Carr

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.

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







				Black Oxide

				12.0	0.4724"	151	77	Round	12 mm	Standard	00000000	000000


				12.2	0.4803"	151	76.6	Round	12.2 mm	Standard	00000000	00000
				12.5	0.4921"	151	76	Round	12.5 mm	Standard	00000000	00000
				13.0	0.5118"	151	75	Round	13 mm	Standard	00000000	00000




						Titanium Nitride (TiN) Coated

						12.0	0.4724"	151	77	Round	12 mm	Standard	0000000	00000


						12.5	0.4921"	151	76	Round	12.5 mm	Standard	0000000	00000
						13.0	0.5118"	151	75	Round	13 mm	Standard	0000000	00000

Cobalt Steel Drill Bits


Jobbers' 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.

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, titanium, and fiberglass.

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.

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







				Titanium Nitride (TiN) Coated

				12.0	0.4724"	151	101.1	Round	12 mm	Split	0000000	000000


				12.5	0.4921"	151	101	Round	12.5 mm	Split	0000000	00000
				13.0	0.5118"	151	101.1	Round	13 mm	Split	0000000	00000




						Titanium Aluminum Nitride (TiAlN) Coated

						12.0	0.4724"	151	83	Round	12 mm	Split	00000000	000000




								Gold Oxide

								12.0	0.4724"	151	77	Round	12 mm	Split	000000000	00000


								12.5	0.4921"	151	76	Round	12.5 mm	Split	000000000	00000
								13.0	0.5118"	151	75	Round	13 mm	Split	000000000	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, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Point Angle	Drill Bit Point Type		Each
Uncoated



		12.0	0.4724"	151	110	Round	12	60°	Standard	000000000	000000


		12.5	0.4921"	151	113	Round	12.5	60°	Standard	000000000	00000
		13.0	0.5118"	151	113	Round	13	60°	Standard	000000000	00000

Chip-Clearing High-Speed Steel Drill Bits


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.

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.

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







				Titanium Nitride (TiN) Coated

				12.0	0.4724"	151	101	Parabolic	Round	12	Split	0000000	000000


				12.5	0.4921"	151	101	Parabolic	Round	12.5	Split	0000000	00000




						Uncoated

						12.0	0.4724"	151	77	Parabolic	Round	12	Split	0000000	00000


						12.5	0.4921"	151	76	Parabolic	Round	12.5	Split	0000000	00000
						13.0	0.5118"	151	75	Parabolic	Round	13	Split	0000000	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, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				12.5	0.4921"	151	101	Parabolic	Round	12.5	Split	00000000	000000

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Standard

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.

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, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type		1-9	10-Up
Jobbers' Length







				Black Oxide

				12.0	0.4724"	151	86.6	Round	12 mm	Standard	00000000	000000	000000