93mm 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				Each
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type		1-11	12-Up
Jobbers' Length







				Black Oxide

				5.4	0.2126"	93	46.2	Round	5.4 mm	Standard	0000000	00000	00000


				5.5	0.2165"	93	46	Round	5.5 mm	Standard	0000000	0000	0000
				5.6	0.2205"	93	45.8	Round	5.6 mm	Standard	0000000	0000	0000
				5.7	0.2244"	93	45.6	Round	5.7 mm	Standard	0000000	0000	0000
				5.8	0.2283"	93	45.4	Round	5.8 mm	Standard	0000000	0000	0000
				6.0	0.2362"	93	45	Round	6 mm	Standard	0000000	0000	0000




						Titanium Nitride (TiN) Coated

						5.5	0.2165"	93	46	Round	5.5 mm	Standard	0000000	0000	0000


						6.0	0.2362"	93	48	Round	6 mm	Standard	0000000	0000	0000

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

				5.6	0.2205"	93	57	Round	5.6 mm	Split	00000000	000000


				5.7	0.2244"	93	57	Round	5.7 mm	Split	0000000	0000
				5.9	0.2323"	93	57	Round	5.9 mm	Split	00000000	00000




						Titanium Aluminum Nitride (TiAlN) Coated

						5.5	0.2165"	93	48.8	Round	5.5 mm	Split	00000000	00000


						5.7	0.2244"	93	57	Round	5.7 mm	Split	00000000	00000
						6.0	0.2362"	93	48	Round	6 mm	Split	00000000	00000




								Gold Oxide

								5.5	0.2165"	93	46	Round	5.5 mm	Split	00000000	0000


								5.6	0.2205"	93	45.8	Round	5.6 mm	Split	00000000	0000
								5.7	0.2244"	93	45.6	Round	5.7 mm	Split	00000000	0000
								5.9	0.2323"	93	45.2	Round	5.9 mm	Split	00000000	0000
								6.0	0.2362"	93	45	Round	6 mm	Split	00000000	0000

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

				5.4	0.2126"	93	57	Parabolic	Round	5.4	Split	00000000	00000


				5.7	0.2244"	93	57	Parabolic	Round	5.7	Split	00000000	0000
				5.75	0.2264"	93	57	Parabolic	Round	5.75	Split	00000000	0000
				5.8	0.2283"	93	57	Parabolic	Round	5.8	Split	00000000	0000
				5.9	0.2323"	93	57	Parabolic	Round	5.9	Split	00000000	0000

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







				Black Oxide

				5.5	0.2165"	93	46	High Helix	Round	5.5	Split	00000000	00000


				6.0	0.2362"	93	45	High Helix	Round	6	Split	00000000	0000




						Titanium Nitride (TiN) Coated

						5.5	0.2165"	93	57	Parabolic	Round	5.5	Split	0000000	0000


						5.6	0.2205"	93	57	Parabolic	Round	5.6	Split	0000000	0000
						6.0	0.2362"	93	57	Parabolic	Round	6	Split	0000000	00000




								Uncoated

								5.5	0.2165"	93	46	Parabolic	Round	5.5	Split	0000000	0000


								5.6	0.2205"	93	57	Parabolic	Round	5.6	Split	0000000	0000
								6.0	0.2362"	93	45	Parabolic	Round	6	Split	0000000	0000

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



		5.5	0.2165"	93	63	Round	5.5	60°	Standard	000000000	00000


		6.0	0.2362"	93	69	Round	6	60°	Standard	000000000	00000

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

				5.5	0.2165"	93	47.1	Round	5.5 mm	Standard	00000000	000000	000000


				6.0	0.2362"	93	48	Round	6 mm	Standard	00000000	00000	00000

Chip-Clearing Cobalt Steel Drill Bits for Nickel and Stainless Steel

Jobbers' Length

Parabolic Flute

Round Shank

Split

Excellent for challenging metals such as stainless steel and nickel alloys, these bits cut aggressively and evacuate chips quickly. The grooved flutes prevent clogs and improve coolant flow to dissipate heat that can damage the bit or your material. Bits are made of tough and wear-resistant cobalt steel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

						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 Aluminum Nitride (TiAlN) Coated

				6.0	0.2362"	93	57	Parabolic	Round	6	Split	0000000	000000

Diamond-Coated Router Bits for Composites

With a diamond coating, these bits resist wear when used on abrasive materials, making them last about 50 times longer than uncoated bits. Their sharp cutting edges and flute shapes are specifically designed to cut through tough materials such as composites with minimal resistance. This means less strain on your router and more control when cutting, leading to a smooth cut. Bits are made of solid carbide for longer tool life and faster cutting speeds than high-speed steel.

Diamond-Coated Carbide


Drill/Mill Cut Style—Plunge-Cut	Drill/Mill Cut Style—Plunge-Cut, Straight Flutes

Drill/Mill Cut Style—Bits with a drill/mill cut style have a pointed end for easier plunge cuts than square-cut bits.

Plunge Cut—Plunge-cutting bits let you cut directly into the workpiece from above. Other bits are best for operations where the peripheral teeth do most of the work such as trimming, contouring, and finishing.

Straight Flutes—Bits with straight flutes are for general purpose use. They quickly remove material, leaving a rough finish.

	Overall Lg., mm	No. of Flutes	For Tool Type	For Use On		Each
Drill/Mill Cut Style—Plunge-Cut







	Straight Flutes

	12	36	12	93	14	CNC Machine	Fiber-Reinforced Plastic, Composite	0000000	0000000