102mm 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.

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







				Gold Oxide

				6.0	0.2362"	102	66.7	Round	6 mm	Split	1	30565A283	00000


				6.0	0.2362"	102	66.7	Round	6 mm	Split	10	30565A437	00000
				6.1	0.2402"	102	66.7	Round	6.1 mm	Split	1	30565A284	0000
				6.2	0.2441"	102	66.7	Round	6.2 mm	Split	1	30565A285	0000
				6.3	0.248"	102	66.7	Round	6.3 mm	Split	1	30565A286	0000




						Uncoated

						6.0	0.2362"	102	56.4	Round	6 mm	Standard	1	2951A136	0000


						Short Length







										Black Oxide

										12.0	0.4724"	102	27	Round	12 mm	Split	1	28255A65	00000


										12.2	0.4803"	102	51	Round	12.2 mm	Split	1	28255A137	00000
										12.5	0.4921"	102	51	Round	12.5 mm	Split	1	28255A138	00000
										13.0	0.5118"	102	32.5	Round	13 mm	Split	1	28255A97	00000




												Titanium Nitride (TiN) Coated

												12.0	0.4724"	102	50.8	Round	12 mm	Split	1	2979N34	00000


												13.0	0.5118"	102	50.8	Round	13 mm	Split	1	2979N35	00000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Short 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.

Short Length—The most rigid bits for drilling the straightest holes.

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







				Titanium Nitride (TiN) Coated

				6.5	0.2559"	102	63	Round	6.5 mm	Split	5058N67	000000


				6.7	0.2638"	102	63	Round	6.7 mm	Split	5058N68	00000


				Short Length







								Uncoated

								12.0	0.4724"	102	26.9	Round	12 mm	Split	2456N137	00000


								13.0	0.5118"	102	24.9	Round	13 mm	Split	2456N138	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank

Short 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.

Short Length—The most rigid bits for drilling the straightest holes.

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







				Uncoated

				6.0	0.2362"	102	53.3	Round	6 mm	Standard	28595A63	000000


				6.0	0.2362"	102	70	Round	6 mm	Split	28595A27	00000


				Short Length







								Uncoated

								14.0	0.5512"	102	42	Round	14 mm	Standard	28805A425	00000

Coolant-Fed Carbide Drill Bits

Jobbers' Length

Round Shank

The hardest and most wear-resistant bits, these deliver coolant to reduce heat and evacuate chips. They are designed for CNC machines that supply coolant through the spindle rather than an external source, such as a hose and nozzle. Coolant flows directly from holes in the bit's tip onto the drilling surface. This speeds up cuts and leads to excellent performance in deep holes and tough materials such as stainless steel and titanium.

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

Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.

					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 Aluminum Nitride (TiAlN) Coated

				8.5	0.3346"	102	61	Round	10 mm	Four Facet	2396N342	0000000


				9.0	0.3543"	102	61	Round	10 mm	Four Facet	2396N416	000000
				9.5	0.374"	102	61	Round	10 mm	Four Facet	2396N481	000000
				10.0	0.3937"	102	61	Round	10 mm	Four Facet	2396N138	000000

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

				6.5	0.2559"	102	61	Parabolic	Round	6.5	Split	2771N56	00000


				6.7	0.2638"	102	61	Parabolic	Round	6.7	Split	2771N57	00000

Hole-Starting Cobalt Steel Drill Bits

120° Point Angle

Standard

Create an accurate starting place in your workpiece. Cut an indent with these bits, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Cobalt steel resists wear to stay sharp when cutting hard materials, such as nickel. Also known as spotting drill bits.

Short Length—The most rigid bits for drilling the straightest holes.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

					Shank			90° Point Angle
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Drill Bit Point Type		Each
Short Length







				Uncoated

				12.0	0.4724"	102	31.7	Round	12	Standard	27445A94	000000

Left-Hand Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Split

The flutes spiral in the opposite direction of other bits and stay sharp longer than high-speed steel. They’re 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.

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				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







				Uncoated

				6.0	0.2362"	102	70	Round	6 mm	Split	3474A58	000000	000000

Carbide-Tipped Drill Bits for Hardened Steel

Jobbers' Length

Round Shank

Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits. A lower-priced alternative to solid carbide, they stay sharp when drilling abrasive material but won’t last as long.

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	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				6.0	0.2362"	102	24	Round	6 mm	Notched	2973A64	000000

High-Speed Steel Square End Mills

4 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.

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

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 Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Uncoated High-Speed Steel







				4 Flutes

				20	0.000 to 0.038	15.9	47.6	102	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	8854A83	000000