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	Mfr.		1-11	12-Up
Jobbers' Length







				Black Oxide

				5.4	0.2126"	93	46.2	Round	5.4 mm	Standard	Dormer Pramet	2958A87	00000	00000


				5.5	0.2165"	93	46	Round	5.5 mm	Standard	Dormer Pramet	2958A88	0000	0000
				5.6	0.2205"	93	45.8	Round	5.6 mm	Standard	Dormer Pramet	2958A89	0000	0000
				5.7	0.2244"	93	45.6	Round	5.7 mm	Standard	Dormer Pramet	2958A91	0000	0000
				5.8	0.2283"	93	45.4	Round	5.8 mm	Standard	Dormer Pramet	2958A92	0000	0000
				6.0	0.2362"	93	45	Round	6 mm	Standard	Dormer Pramet	2958A94	0000	0000




						Titanium Nitride (TiN) Coated

						5.5	0.2165"	93	46	Round	5.5 mm	Standard	Dormer Pramet	8950A55	0000	0000


						6.0	0.2362"	93	48	Round	6 mm	Standard	Chicago-Latrobe	8950A18	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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				5.6	0.2205"	93	57	Round	5.6 mm	Split	Dormer Pramet	5058N131	000000


				5.7	0.2244"	93	57	Round	5.7 mm	Split	Chicago-Latrobe	5058N33	0000
				5.9	0.2323"	93	57	Round	5.9 mm	Split	Dormer Pramet	5058N132	00000




						Titanium Aluminum Nitride (TiAlN) Coated

						5.5	0.2165"	93	48.8	Round	5.5 mm	Split	Guhring	2753A172	00000


						5.7	0.2244"	93	57	Round	5.7 mm	Split	Chicago-Latrobe	2753A235	00000
						6.0	0.2362"	93	48	Round	6 mm	Split	Guhring	2753A173	00000




								Gold Oxide

								5.5	0.2165"	93	46	Round	5.5 mm	Split	Dormer Pramet	29355A84	0000


								5.6	0.2205"	93	45.8	Round	5.6 mm	Split	Dormer Pramet	29355A85	0000
								5.7	0.2244"	93	45.6	Round	5.7 mm	Split	Dormer Pramet	29355A86	0000
								5.9	0.2323"	93	45.2	Round	5.9 mm	Split	Dormer Pramet	29355A91	0000
								6.0	0.2362"	93	45	Round	6 mm	Split	Dormer Pramet	29355A92	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	Mfr.		Each
Jobbers' Length







				Uncoated

				5.4	0.2126"	93	55	Parabolic	Round	5.4	Split	Viking Norseman Drill	2771N756	00000


				5.7	0.2244"	93	55	Parabolic	Round	5.7	Split	Viking Norseman Drill	2771N758	0000
				5.75	0.2264"	93	55	Parabolic	Round	5.75	Split	Viking Norseman Drill	2771N759	0000
				5.8	0.2283"	93	55	Parabolic	Round	5.8	Split	Viking Norseman Drill	2771N761	0000
				5.9	0.2323"	93	55	Parabolic	Round	5.9	Split	Viking Norseman Drill	2771N762	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	Mfr.		Each
Uncoated



		5.5	0.2165"	93	63	Round	5.5	60°	Standard	ICS	27465A416	00000


		6.0	0.2362"	93	69	Round	6	60°	Standard	ICS	27465A417	00000

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	Mfr.		Each
Jobbers' Length







				Black Oxide

				5.5	0.2165"	93	46	High Helix	Round	5.5	Split	Dormer Pramet	30055A65	000000


				6.0	0.2362"	93	45	High Helix	Round	6	Split	Dormer Pramet	30055A66	00000




						Titanium Nitride (TiN) Coated

						5.5	0.2165"	93	57	Parabolic	Round	5.5	Split	Dormer Pramet	7333N25	00000


						5.6	0.2205"	93	57	Parabolic	Round	5.6	Split	Dormer Pramet	7333N26	00000
						6.0	0.2362"	93	57	Parabolic	Round	6	Split	Dormer Pramet	7333N27	00000




								Uncoated

								5.5	0.2165"	93	46	Parabolic	Round	5.5	Split	Dormer Pramet	2754A29	0000


								5.6	0.2205"	93	57	Parabolic	Round	5.6	Split	Dormer Pramet	2754A99	0000
								6.0	0.2362"	93	45	Parabolic	Round	6	Split	Dormer Pramet	2754A31	0000

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	Mfr.		Each
Jobbers' Length







				Titanium Aluminum Nitride (TiAlN) Coated

				6.0	0.2362"	93	57	Parabolic	Round	6	Split	Guhring	3020A48	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	Mfr.		1-9	10-Up
Jobbers' Length







				Black Oxide

				5.5	0.2165"	93	47.1	Round	5.5 mm	Standard	Dormer Pramet	29855A62	000000	000000


				6.0	0.2362"	93	48	Round	6 mm	Standard	Dormer Pramet	29855A63	00000	00000

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	Mfr.		Each
Drill/Mill Cut Style—Plunge-Cut







	Straight Flutes

	12	36	12	93	14	CNC Machine	Fiber-Reinforced Plastic, Composite	Guhring	6582N36	0000000

Reamers

Finish holes to precise inch, metric, wire gauge, or letter sizes with these reamers.

Square Shank

Spiral Flute

Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).

Spiral Flute—Since these reamers clear chips better than straight flutes, they leave holes with a smoother finish. They're better for holes with breaks in the surface, such as a keyway, because they cut continuously across the breaks instead of moving in and out.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

				Lg., mm
	Reamer Dia.	Material	Square Shank Size, mm	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance, mm	Specs. Met	For Use On	Mfr.		Each
Spiral Flute







				Metric

				5.5000 mm	High-Speed Steel	4.3	47	93	6	Left Hand	0.005 to 0.01	DIN 206	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Dormer Pramet	2822A38	000000


				6.0000 mm	High-Speed Steel	4.9	47	93	6	Left Hand	0.005 to 0.01	DIN 206	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Dormer Pramet	2822A39	00000

Reamers for Taper-Pin Holes

Shape holes to match the profile of taper pins. After drilling a hole that matches the size of the small end of the taper pin you want to install, use these reamers to taper and finish the hole.

Square Shank

Straight Flute

Turn these reamers by hand with an adjustable wrench, straight-handle tap wrench, or pin vise (sold separately).

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

						Lg., mm
	For Taper Pin No.	Reamer Dia. (A), mm	Reamer Dia. (B), mm	Material	Square Shank Size, mm	Flute	Overall	No. of Flutes	Cutting Dia. Tolerance, mm	Rate of Taper	For Use On	Mfr.		Each
Straight Flute







				Metric

				4 mm	5.2600	3.9000	High-Speed Steel	4.0	68	93	4	0 to 0.075	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Dormer Pramet	30165A64	000000

Fast-Cut Roughing Carbide Square End Mills

4 Flutes

Remove large amounts of material quickly without sacrificing tool life. Variable spacing between flutes reduces cutting time and vibration in high-volume jobs.

Made of solid carbide, these end mills are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the end mill from breaking. They have a square end for milling square slots, pockets, and edges.

Titanium Aluminum Nitride (TiAlN)-Coated Carbide—End mills with a titanium aluminum nitride (TiAlN) coating and end mills with an aluminum titanium nitride (AlTiN) coating 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.

4 Flutes—End mills with four flutes have better chip clearance than end mills with five flutes, so they’re often used for high-volume, high-speed plunge, slotting, and roughing cuts. Serrations along the cutting edge act as chip breakers, so these end mills can remove large amounts of material at high speeds.

Center Cutting—Center-cutting end mills allow plunge cuts into a surface.

	Mill, mm
	Dia.	Dia. Tolerance	Shank Dia., mm	Lg. of Cut, mm	Overall Lg., mm	Flute Pitch	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style	Mfr.		Each
Titanium Aluminum Nitride (TiAlN)-Coated Carbide







				4 Flutes

				12	-0.07 to 0.000	12	36	93	Coarse	Variable	30° to 32°	Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	Guhring	8581A111	0000000