79 ga 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
Jobbers' Length







				Black Oxide

				79 Ga.	0.0145"	3/4"	0.1"	Round	0.0145"	Standard	2901A257	00000




						Titanium Nitride (TiN) Coated

						79 Ga.	0.0145"	3/4"	0.1"	Round	0.0145"	Standard	29045A839	0000




								Uncoated

								79 Ga.	0.0145"	3/4"	0.1"	Round	0.0145"	Standard	30585A97	0000


								Extended Length







												Black Oxide

												79 Ga.	0.0145"	1 1/2"	0.29"	Round	0.0145"	Standard	3096A197	0000

Drill Bit Size Gauges

For Wire

Gauge

Measure drill bit sizes with these gauges.

For System of Measurement	For Use With	For Drill Bit Size	Wd.	Ht.	Thk.	Material	Color	Mounting Hole Dia.		Each
Wire Gauge	Drills	80 Ga., 79 Ga., 78 Ga., 77 Ga., 76 Ga., 75 Ga., 74 Ga., 73 Ga., 72 Ga., 71 Ga., 70 Ga., 69 Ga., 68 Ga., 67 Ga., 66 Ga., 65 Ga., 64 Ga., 63 Ga., 62 Ga., 61 Ga.	1"	3"	5/64"	Steel	Silver	1/8"	8986A66	000000

Expanded-Shank Carbide Drill Bits


Jobbers' Length	Standard

The shank fits the same-size chuck as standard drill bits, so you can spend less time setting up. Because these bits make very small holes, they’re often used for drilling circuit boards. Carbide bits are the the hardest and most wear resistant. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. Carbide can be brittle, however, so bits require a rigid machine tool holder to prevent breakage and should not be used in hand drilling applications.

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.

Uncoated—Excellent for a range of materials but won't last as long as coated bits.

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







				Titanium Aluminum Nitride (TiAlN) Coated

				79 Ga.	0.0145"	1 1/2"	0.14"	Expanded Round	1/8"	Four Facet	2598N111	000000




						Uncoated

						79 Ga.	0.0145"	1 1/2"	0.22"	Expanded Round	1/8"	Standard	2841A84	00000

Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Standard

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.

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

					Shank				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-11	12-Up
Jobbers' Length







				Titanium Nitride (TiN) Coated

				79 Ga.	0.0145"	3/4"	0.13"	Round	0.0145"	Standard	27995A818	00000	00000




						Uncoated

						79 Ga.	0.0145"	3/4"	0.1"	Round	0.0145"	Standard	3033A297	0000	0000

Carbide Drill Bits

Jobbers' Length

Round Shank

The hardest and most wear-resistant drill bits you can buy. Carbide 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.

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

Uncoated—Excellent for a range of materials but won't last as long as coated bits.

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







				Uncoated

				79 Ga.	0.0145"	1 1/4"	0.2"	Round	0.0145"	Four Facet	2860A97	000000

M2 High-Speed Tool Steel Rod Sets

Supplied in a metal index case with fold-out panels, these rods, also known as drill blanks, have an undersized diameter for machining your own jobbers'-length drill bits. They are hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.

Includes	No. of Pieces	Dia. Tolerance	Mechanical Finish		Each
Sizes 61-80 and a metal index case	20	-0.0002" to 0"	Precision Ground	2952A7	000000

Chip-Clearing High-Speed Steel Drill Bits

Jobbers' Length

High Helix Flute

Round Shank

Standard

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.

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

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.	Flute Type	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				79 Ga.	0.0145"	3/4"	0.1"	High Helix	Round	0.0145"	Standard	2912A258	00000

Undersized Hardened Multipurpose M2 High-Speed Tool Steel Rods

These rods, also known as drill blanks, have an undersized diameter for machining your own drill bits. They're hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Dia.	Dia. Tolerance	Drill Bit Size	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
0.0145"	-0.0002" to 0"	79 Ga.	3/4"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A297	00000

Extensions for Round-Shank Drill Bits

One-Piece Extensions

Attach to the shank of a drill bit to extend its reach.

One-Piece Extensions—To attach one-piece extensions, insert a drill bit into the extension and tighten the knurled collar.

	For Drill Bit
	Size	Size Decimal Equiv.	Shank Size	Shank Size	Overall Lg.	OD	Material		Each
For Wire Gauge Drill Bits







				One-Piece Extensions

				79 Ga.	0.0145"	0.015"	1/8"	4"	1/8"	Steel	2864A112	000000


				79 Ga.	0.0145"	0.015"	3/16"	4"	3/16"	Steel	2864A212	00000