3 5/16" Long Drill Bits | McMaster-Carr

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9 Products

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.

Carbide Jobbers' Length


Parabolic Flute	Standard

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.

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 fits in a drill press chuck.

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

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





				Wire Gauge
				21 Ga.	0.159"	3 5/16"	1.93"	Parabolic	Round	0.1591"	Standard	2	0000000	000000
				20 Ga.	0.161"	3 5/16"	1.92"	Parabolic	Round	0.161"	Standard	2	00000000	00000
				19 Ga.	0.166"	3 5/16"	1.92"	Parabolic	Round	0.1661"	Standard	2	00000000	00000
				18 Ga.	0.1695"	3 5/16"	1.91"	Parabolic	Round	0.1693"	Standard	2	00000000	00000

				Uncoated





								Wire Gauge
								21 Ga.	0.159"	3 5/16"	1.93"	Parabolic	Round	0.1591"	Standard	2	0000000	00000
								20 Ga.	0.161"	3 5/16"	1.92"	Parabolic	Round	0.161"	Standard	2	00000000	00000
								19 Ga.	0.166"	3 5/16"	1.92"	Parabolic	Round	0.1661"	Standard	2	00000000	00000
								18 Ga.	0.1695"	3 5/16"	1.91"	Parabolic	Round	0.1693"	Standard	2	00000000	00000

Tapping Drill Bits

Drill and thread holes with the same bit. The tap section has a plug chamfer with 3-5 chamfered threads for through holes and blind holes.

High-Speed Steel—For Pipe and Conduit Threads

Spiral Flute

Add internal threads to pipe and conduit when installing new runs or expanding an existing system. Wear and heat resistant, these bits are versatile for use on a range of materials.

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.

Spiral Flute—Pull chips out of the hole to prevent buildup when tapping.

Square Shank—Use in a tap holder for drill presses and milling machines.

									Plug Chamfer
	Pipe Size	Thread Lg.	Drill Bit Size	Overall Lg.	Flute Type	No. of Flutes	Thread Type	Shank Type		Each
Uncoated


		1/4	1 1/16"	7/16"	3 5/16"	Spiral	4	NPTF	Square	0000000	0000000