6 1/2" Long Drill Bits | McMaster-Carr

Extended Length—Drill through panels and thick workpieces with our longest bits. Their length is good for creating deep holes but makes them less rigid than other bits. As a result, they are more prone to wobbling or breaking, especially when drilling hard materials.

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.	Type	Size	Drill Bit Point Type		Each
Extended Length







				Black Oxide

				21/64"	0.3281"	6 1/2"	3.63"	Round	21/64"	Standard	29315A142	000000


				11/32"	0.3438"	6 1/2"	3.6"	Round	11/32"	Standard	29315A143	00000
				O	0.316"	6 1/2"	3.65"	Round	0.316"	Standard	3110A66	00000
				P	0.323"	6 1/2"	3.64"	Round	0.323"	Standard	3110A67	00000
				Q	0.332"	6 1/2"	3.62"	Round	0.332"	Standard	3110A68	00000
				R	0.339"	6 1/2"	3.61"	Round	0.339"	Standard	3110A69	00000




						Titanium Nitride (TiN) Coated

						21/64"	0.3281"	6 1/2"	4.13"	Round	21/64"	Standard	28965A745	00000


						11/32"	0.3438"	6 1/2"	4.13"	Round	11/32"	Standard	28965A746	00000
						Q	0.332"	6 1/2"	4.13"	Round	0.332"	Standard	28965A839	00000




								Uncoated

								21/64"	0.3281"	6 1/2"	4.13"	Round	21/64"	Standard	2939A77	00000


								11/32"	0.3438"	6 1/2"	4.13"	Round	11/32"	Standard	2939A78	00000

Cobalt Steel Drill Bits

Jobbers' Length

Morse Taper Shank

Extended 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.

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







				Uncoated

				21/64"	0.3281"	6 1/2"	3.25"	Morse Taper	Morse 1	Split	3068A212	000000


				11/32"	0.3438"	6 1/2"	3.25"	Morse Taper	Morse 1	Split	3068A14	00000


				Extended Length







								Uncoated

								21/64"	0.3281"	6 1/2"	3.46"	Round	21/64"	Split	3063A129	00000


								11/32"	0.3438"	6 1/2"	3.43"	Round	11/32"	Split	3063A131	00000

Adjustable-Blade Drill Bits for Wood

Bore a variety of hole sizes with one bit—just slide the blade to the desired diameter and then tighten the screw. These have two sharp edges for faster cuts than fluted bits and won't cause the surface of the material to splinter. A centering point keeps them stable while drilling soft and hard woods such as pine, plywood, and oak. Like standard flat-blade bits, these drill rough holes but should be used in a drill press rather than a hand-held tool. Also known as spade bits.

	Overall Lg.	Shank Size	Drill Bit Point Type		Each
Uncoated







	Round Shank

	7/8" to 3"	0.875" to 3"	0.875" to 3"	6 1/2"	11/32"	Standard	3140A53	000000

Chip-Clearing Drill Bits for Wood

Quick-Change Hex Shank

Prevent clogs that wear the bit and slow down drilling. The flutes on these bits have an open design that pulls chips out of the hole faster than standard spiral flutes. Also known as pole or ship auger bits, they are used to cut deep holes through lumber, railroad ties, and utility poles.

	Max. Drilling Dp.	Shank Size	Drill Bit Point Type		Each
Uncoated







	Quick-Change Hex Shank

	1 3/8"	1.375"	6 1/2"	4"	7/16"	Screw	2897A19	000000


	1 1/2"	1.5"	6 1/2"	4"	7/16"	Screw	2897A21	00000

Carbide-Tipped Drill Bits


Extended Length Round Shank	Standard

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.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Extended Length







				Uncoated

				11/32"	0.3438"	6 1/2"	3.44"	Round	11/32"	Standard	29465A26	000000

Tapping Screw Installation Drill Bits for Masonry and Concrete

Create an undersized hole so concrete tapping screws fit tightly once they're threaded into place. These bits are slightly smaller than the matching screw size. They have a carbide tip that resists wear and heat to stay sharp.

Round Shank for Hammer and Rotary Drilling

Use these bits in rotary hammers that have a drill chuck. Simultaneous rotary and hammering action drills faster and penetrates material with less pressure than rotary-only bits. Also known as percussion or impact bits.

	Overall Lg.	Max. Drilling Dp.	Shank Size	Features		Each
Uncoated







	Standard Point

	1/4"	3/16"	0.1875"	6 1/2"	5"	5/32"	Flat on Shank	90161A723	00000

Light Duty Air-Powered Drills

Style E

Designed for intermittent use.

Style E—Styles E, F, and G have a lever throttle with a lock to prevent accidental starts.

Keyed Chuck—Drills with keyed chuck can be tightened with the included key.

								Air Inlet
	Style	For Max. Bit Shank Size	Max. No-Load Rotational Speed, rpm	Drive Direction	Chuck Type	Power, hp	Average Air Consumption @ Pressure	Pipe Size	Thread Type	Gender	Exhaust Location	Overall Lg.	Wt., lb.		Each
For Hex and Round Bit Shanks



		E	3/8"	20,000	Clockwise	Keyed	0.48	4 ft³/min @ 90 psi	1/4	NPT	Female	Front	6 1/2"	2	27755A14	0000000

High-Speed Steel Ball End Mills


Ball Cut Style	4 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.

4 Flutes—End mills with four flutes provide a finer finish and operate with less vibration when run at high speeds.

	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







				4 Flutes

				1"	0.000" to 0.003"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Ball	2866A86	0000000

Long-Reach Fast-Cut Carbide Square End Mills with Chamfer Corner

These end mills have an extended neck with a reduced diameter that prevents them from rubbing against your workpiece when deep milling. Variable spacing between the flutes reduces vibration, allowing these end mills to provide fast cuts, smooth finishes, and long tool life on hard materials. A 45° corner chamfer improves cutting edge strength, so these end mills last longer than standard square end mills when milling hard material; however they do not create as sharp of a corner. They have a square end for milling square-bottomed slots, pockets, and edges. All are center cutting, allowing plunge cuts into a surface.

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.

A titanium aluminum nitride (TiAlN) coating allows them to 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. This makes these good for aggressive machining while roughing or making interrupted cuts.

	Mill			Neck
	Dia.	Dia. Tolerance	Shank Dia.	Dia.	Lg.	Lg. of Cut	Overall Lg.	Chamfer Wd.	Corner Cutting Angle	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Titanium Aluminum Nitride (TiAlN)-Coated Carbide







				4 Flutes

				1"	-0.002" to 0"	1"	0.94"	3.125"	1 1/8"	6 1/2"	0.02"	45°	Variable	38°	Aluminum, Brass, Bronze, Copper, Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	8382N18	0000000

Cobalt Steel Square End Mills

4 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 square end for milling square slots, pockets, and edges.

End mills with fewer flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts; end mills with more flutes provide a finer finish and operate with less vibration when run at high speeds.

Uncoated Cobalt Steel—Use uncoated end mills for general purpose milling and short production runs.

Titanium Carbon Nitride (TiCN)-Coated Cobalt Steel—Use titanium carbon nitride (TiCN)-coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. They have a hard, smooth finish that resists chipping and wear and prevents material from accumulating on the cutting edge. They’re especially good for use in aluminum.

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

	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







				4 Flutes

				1"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	2883A31	0000000


				Titanium Carbon Nitride (TiCN)-Coated Cobalt Steel







								4 Flutes

								1"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Center Cutting	Square	8933A82	000000

Roughing High-Speed Steel Square End Mills


5 Flutes	6 Flutes

Serrations along the cutting edge act as chip breakers, so these end mills can remove large amounts of material at high speeds. They are high-speed steel for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. Their square end makes them good for milling square slots and edges.

Noncenter Cutting—Noncenter-cutting end mills are for operations where the peripheral teeth do most of the work, such as shoulder milling, contouring, and finishing. They cannot be used for plunge cuts.

	Mill
	Dia.	Dia. Tolerance	Shank Dia.	Lg. of Cut	Overall Lg.	Flute Pitch	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Uncoated High-Speed Steel







				5 Flutes

				1"	-0.005" to 0.005"	1"	4"	6 1/2"	Coarse	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	8819A64	0000000




						6 Flutes

						1 1/4"	-0.005" to 0.005"	1 1/4"	4"	6 1/2"	Coarse	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	8819A78	000000

High-Speed Steel Square End Mills for Aluminum, Brass, and Bronze


2 Flutes	3 Flutes

With a higher helix angle than standard high-speed steel end mills, these clear more chips and generate less heat, making them good for milling soft material, such as aluminum, brass and bronze. They are center cutting for making plunge cuts into surfaces and have a square-end cut style for milling square slots, pockets, and edges.

Uncoated High-Speed Steel—Use uncoated end mills for general purpose milling and short production runs.

Titanium Carbon Nitride (TiCN)-Coated High-Speed Steel—Use titanium carbon nitride (TiCN)-coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. They have a hard, smooth finish that resists chipping and wear and prevents material from accumulating on the cutting edge. They’re especially good for use in aluminum.

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

3 Flutes—End mills with three flutes produce a finer finish and operate with less vibration when run at high speeds.

	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"	4"	6 1/2"	Equal	38°	Aluminum, Brass, Bronze	Center Cutting	Square	2983A42	0000000




						3 Flutes

						1"	0.000" to 0.0015"	1"	4"	6 1/2"	Equal	37°	Aluminum, Brass, Bronze	Center Cutting	Square	2716A49	00000


						Titanium Carbon Nitride (TiCN)-Coated High-Speed Steel







										3 Flutes

										1"	0.000" to 0.0015"	1"	4"	6 1/2"	Equal	37°	Aluminum, Brass, Bronze	Center Cutting	Square	2716A88	00000

Roughing Cobalt Steel Ball End Mills

Ball Cut Style

4 Flutes

6 Flutes

Serrations along the cutting edge act as chip breakers, so these end mills can remove large amounts of material at high speeds without sacrificing tool life. 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 stainless steel, titanium, and tool steel. They have a coarse pitch and create large chips, so they’re also more efficient when working on soft metals such as aluminum, brass, and bronze. They have a ball end for milling rounded slots, slopes, and contours. All are center cutting, allowing plunge cuts into a surface.

End mills with fewer flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts. End mills with more flutes provide a finer finish and operate with less vibration when run at high speeds.

	Mill
	Dia.	Dia. Tolerance	Shank Dia.	Lg. of Cut	Overall Lg.	Flute Pitch	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Uncoated Cobalt Steel







				4 Flutes

				1"	-0.0026" to 0.0026"	1"	4"	6 1/2"	Coarse	Equal	30°	Aluminum, Brass, Bronze, Copper, Stainless Steel, Titanium, Tool Steel	Center Cutting	Ball	8427N18	0000000




						6 Flutes

						1 1/4"	-0.0031" to 0.0031"	1 1/4"	4"	6 1/2"	Coarse	Equal	30°	Aluminum, Brass, Bronze, Copper, Stainless Steel, Titanium, Tool Steel	Center Cutting	Ball	8427N21	000000


						1 1/2"	-0.0031" to 0.0031"	1 1/4"	4"	6 1/2"	Coarse	Equal	30°	Aluminum, Brass, Bronze, Copper, Stainless Steel, Titanium, Tool Steel	Center Cutting	Ball	8427N23	000000

Carbide Rounded-Edge Square End Mills for Aluminum, Brass, and Bronze


Rounded-Edge-Square Cut Style

With a diamondlike coating (DLC), these end mills are sharp enough to cut aluminum, brass, and bronze. Often used for slotting and pocketing cuts in mold and die making, they have a 90° profile and rounded corners, which reduce flute breakage and chipping. Also known as corner radius end mills. All are center cutting, allowing plunge cuts into a surface.

	Mill
	Dia.	Dia. Tolerance	Shank Dia.	Lg. of Cut	Corner Cut Radius	Overall Lg.	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Diamondlike Carbon (DLC)-Coated Carbide







				3 Flutes

				3/4"	-0.001" to 0"	3/4"	4"	0.03"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N11	0000000


				3/4"	-0.001" to 0"	3/4"	4"	0.06"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N12	000000
				3/4"	-0.001" to 0"	3/4"	4"	0.09"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N13	000000
				3/4"	-0.001" to 0"	3/4"	4"	0.12"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N14	000000
				3/4"	-0.001" to 0"	3/4"	4"	0.15"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N15	000000
				3/4"	-0.001" to 0"	3/4"	4"	0.19"	6 1/2"	Equal	35°	Aluminum, Brass, Bronze, Copper	Center Cutting	Rounded-Edge Square	9149N16	000000

Roughing Cobalt Steel Square End Mills

5 Flutes

Coarse Pitch

5 Flutes

Fine Pitch

6 Flutes

Coarse Pitch

6 Flutes

Fine Pitch

Serrations along the cutting edge act as chip breakers, so these end mills can remove large amounts of material at high speeds. 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. Their square end makes them good for milling square slots and edges. All are noncenter-cutting for operations where the peripheral teeth do most of the work, such as shoulder milling, contouring, and finishing. They cannot be used for plunge cuts.

Uncoated Cobalt Steel—Use uncoated end mills for general purpose milling and short production runs.

Titanium Carbon Nitride (TiCN)-Coated Cobalt Steel—Titanium carbon nitride (TiCN)-coated end mills have a hard, smooth finish that resists chipping and wear and prevents material from accumulating on the cutting edge. They’re especially good for use in aluminum. Use 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.

Coarse Pitch—Coarse-pitch end mills create large chips for better performance on softer metal, such as aluminum, brass, bronze, and carbon steel.

Fine Pitch—Fine-pitch end mills last longer than coarse-pitch end mills and produce smaller chips for better performance on harder metal, such as iron, hardened steel, titanium, and tool steel.

Flute Pitch—Flute pitch indicates the size of the serrations on a roughing end mill.

									Coarse Pitch		Fine Pitch
	Mill Dia.	Shank Dia.	Lg. of Cut	Overall Lg.	Flute Spacing	Helix Angle	For Use On	End Mill Type		Each		Each
Uncoated Cobalt Steel







				5 Flutes

				1"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Noncenter Cutting	8817A58	0000000	28315A37	0000000




						6 Flutes

						1 1/4"	1 1/4"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Noncenter Cutting	———	0	28315A45	000000


						Titanium Carbon Nitride (TiCN)-Coated Cobalt Steel







										5 Flutes

										1"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Noncenter Cutting	88335A37	000000	8919A35	000000




												6 Flutes

												1 1/4"	1 1/4"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel	Noncenter Cutting	88335A45	000000	8919A41	000000

High-Speed Steel Square End Mills

3 Flute

4 Flutes

6 Flutes

Use these end mills for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. They have a square end for milling square slots, pockets, and edges.

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.

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

	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







				3 Flutes

				1"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	2849A67	0000000




						4 Flutes

						1"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	3056A57	000000




								6 Flutes

								1 1/8"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	3052A344	000000


								1 1/4"	0.000" to 0.001"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	3052A355	000000
								1 1/4"	0.000" to 0.001"	1 1/4"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	3052A922	000000
								1 1/2"	0.000" to 0.001"	1 1/4"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	3052A944	000000
								2"	0.000" to 0.001"	1 1/4"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Noncenter Cutting	Square	3052A415	000000


								Titanium Nitride (TiN)-Coated High-Speed Steel







												4 Flutes

												1"	0.000" to 0.003"	1"	4"	6 1/2"	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Tool Steel	Center Cutting	Square	8918A155	000000