108mm Long Drill Bits | McMaster-Carr

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13 Products

Drill Bits

Cut holes in a variety of metals, from the softest aluminum to the hardest steel.

High-Speed Steel Jobbers' Length

Round Shank

Split

Our basic drill bit material is also the most versatile. These jobbers' bits have the balance of rigidity and length needed for most applications.

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.

Round Shank—The most common shank type. These fit in the chuck of drill presses and portable drills.

Split Point—Starts cutting on contact so you don’t need a pilot hole. The point also keeps the bit centered for straight and accurate holes, even with a portable drill.

						Shank						Each
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type	No. of Flutes	Specs. Met		1-9	10-Up
Gold Oxide





				Metric
				7.1	0.2795"	108	71.4	Spiral	Round	7.1	Split	2	NAS907 Type B	000000000	00000	00000
				7.2	0.2835"	108	71.4	Spiral	Round	7.2	Split	2	NAS907 Type B	000000000	0000	0000
				7.3	0.2874"	108	71.4	Spiral	Round	7.3	Split	2	NAS907 Type B	000000000	0000	0000

Carbide-Tipped Steel Jobbers' Length

Round Shank

Standard

The performance of solid carbide but at a lower price point. These jobbers' bits have the balance of rigidity and length needed for most applications. Like carbide bits, they 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.

Round Shank—The most common shank type. These fit in the chuck of drill presses and portable drills.

Standard Point—Good for general purpose drilling. You’ll need to make a pilot hole to center the bit.

						Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type	No. of Flutes		Each
Uncoated Carbide Tipped





				Metric
				6.5	0.2559"	108	61	Spiral	Round	6.5	Standard	2	00000000	000000
				7.0	0.2756"	108	61	Spiral	Round	7	Standard	2	00000000	00000

Carbide Jobbers' Length

Round Shank

The hardest and most wear-resistant drill bits you can buy in a length that's rigid enough for most applications. These bits stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so these bits require a rigid machine tool holder to prevent breakage and should not be used in hand drilling applications.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated bits, especially on materials like hardened steel, iron, and stainless steel.

Uncoated—Excellent for a range of metals, they perform best when used on steel, aluminum, brass, and bronze.

Round Shank—The most common shank type fits in a drill press chuck.

Four-Facet Point—The most accurate point style, it centers the bit without a pilot hole and keeps the bit stable while drilling hard metals.

						Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type	No. of Flutes		Each
Titanium Nitride (TiN) Coated





				Metric
				9.0	0.3543"	108	70	Spiral	Round	9	Four Facet	2	0000000	000000

				Uncoated





								Metric
								9.0	0.3543"	108	56	Spiral	Round	9	Four Facet	2	0000000	00000
								9.5	0.374"	108	70	Spiral	Round	9.5	Four Facet	2	0000000	00000

Chip-Clearing Drill Bits

With flutes that lift chips out of the hole, you don't have to stop drilling to clear these bits manually. The flutes improve coolant flow to dissipate heat and prevent clogs that can damage the bit and ruin the hole.

Cobalt Steel Jobbers' Length

Parabolic Flute

Split

The toughness and wear resistance of cobalt steel in a length that's rigid enough for most applications. Cobalt lasts at least twice as long as high-speed steel. It can also run up to 25% faster at higher temperatures without damaging the bit on hard materials such as nickel.

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

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 deep holes.

Round Shank—The most common shank type. These fit in the chuck of drill presses and portable drills.

Split Point—Starts cutting on contact so you don’t need a pilot hole. The point also keeps the bit centered for straight and accurate holes, even with a portable drill.

						Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type	No. of Flutes	Specs. Met		Each
Uncoated





				Metric
				7.0	0.2756"	108	69	Parabolic	Round	7	Split	2	DIN 338	0000000	00000

Drill Bits for Hardened Steel

Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits.

Carbide-Tipped Steel Jobbers' Length

Straght Flute

The performance of solid carbide but at a lower price point. These jobbers' bits have the balance of rigidity and length needed for most applications. Like carbide bits, they are extremely stronger and maintain their sharp edges when drilling abrasive material. But for the longest life, there is no beating carbide.

Round Shank—The most common shank type. These fit in the chuck of drill presses and portable drills.

Notched Point—The chisel-like point keeps the bit centered and clears chips.

						Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type	No. of Flutes		Each
Uncoated Carbide Tipped





				Metric
				6.5	0.2559"	108	26	Straight	Round	6.5	Notched	2	0000000	000000
				7.0	0.2756"	108	28	Straight	Round	7	Notched	2	0000000	00000

Drill Bits for Carbon Fiber, Fiberglass, and Graphite

Cut clean holes in abrasive material without fraying or delaminating the surface. Made of carbide, these bits resist wear to retain a sharp edge, even after after hundreds of cuts.

Carbide Jobbers' Length

Diamond Coated—With the hardest finish, these bits have the longest life.

Brad Point—The sharp center point starts the hole and keeps the bit centered as you drill. Two cutting edges make clean holes, often for installing dowel pins and other hardware.

					Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Point Angle	Drill Bit Point Type	Bit Style	No. of Flutes		Each
Uncoated





				Metric
				9.5	0.374"	108	70	Round	9.5	140°	Brad	Fluted	2	00000000	000000

				Diamond Coated





								Metric
								9.0	0.3543"	108	70	Round	9	140°	Brad	Fluted	2	0000000	000000