55 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	Mfr.		Each
Jobbers' Length







				Black Oxide

				55 Ga.	0.052"	1 7/8"	0.79"	Round	0.052"	Standard	Chicago-Latrobe	2901A231	00000




						Titanium Nitride (TiN) Coated

						55 Ga.	0.052"	1 7/8"	0.79"	Round	0.052"	Standard	Chicago-Latrobe	29045A813	0000




								Uncoated

								55 Ga.	0.052"	1 7/8"	0.79"	Round	0.052"	Standard	Viking Norseman Drill	30585A71	0000


								Short Length







												Black Oxide

												55 Ga.	0.052"	1 5/8"	0.54"	Round	0.052"	Standard	Chicago-Latrobe	2896A571	0000




														Titanium Nitride (TiN) Coated

														55 Ga.	0.052"	1 5/8"	0.63"	Round	0.052"	Standard	Viking Norseman Drill	29425A289	0000




																Uncoated

																55 Ga.	0.052"	1 5/8"	0.63"	Round	0.052"	Standard	Chicago-Latrobe	8947A211	0000


																Extended Length







																				Black Oxide

																				55 Ga.	0.052"	3"	1.67"	Round	0.052"	Standard	Chicago-Latrobe	3096A371	0000




																				Titanium Nitride (TiN) Coated

		55 Ga.	0.052"																	3"	1.75"	Round	0.052"	Standard	Dormer Pramet	28965A824	0000

Drill Bit Size Gauges

For Wire

Gauge

Measure drill bit sizes with these gauges.

For Taps—Drills/taps gauges include a tap size conversion chart.

For System of Measurement	For Use With	For Drill Bit Size	Wd.	Ht.	Thk.	Material	Color	Mounting Hole Dia.		Each
Wire Gauge	Drills/Taps	60 Ga., 59 Ga., 58 Ga., 57 Ga., 56 Ga., 55 Ga., 54 Ga., 53 Ga., 52 Ga., 51 Ga., 50 Ga., 49 Ga., 48 Ga., 47 Ga., 46 Ga., 45 Ga., 44 Ga., 43 Ga., 42 Ga., 41 Ga., 40 Ga., 39 Ga., 38 Ga., 37 Ga., 36 Ga., 35 Ga., 34 Ga., 33 Ga., 32 Ga., 31 Ga., 30 Ga., 29 Ga., 28 Ga., 27 Ga., 26 Ga., 25 Ga., 24 Ga., 23 Ga., 22 Ga., 21 Ga., 20 Ga., 19 Ga., 18 Ga., 17 Ga., 16 Ga., 15 Ga., 14 Ga., 13 Ga., 12 Ga., 11 Ga., 10 Ga., 9 Ga., 8 Ga., 7 Ga., 6 Ga., 5 Ga., 4 Ga., 3 Ga., 2 Ga., 1 Ga.	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	8986A68	000000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Short 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.

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







				Titanium Nitride (TiN) Coated

				55 Ga.	0.052"	1 7/8"	0.88"	Round	0.052"	Standard	Dormer Pramet	27995A673	00000




						Uncoated

						55 Ga.	0.052"	1 7/8"	0.79"	Round	0.052"	Standard	Chicago-Latrobe	3033A271	0000


						Short Length







										Titanium Nitride (TiN) Coated

										55 Ga.	0.052"	1 5/8"	0.2"	Round	0.052"	Standard	Dormer Pramet	28765A916	0000




												Uncoated

												55 Ga.	0.052"	1 5/8"	0.5"	Round	0.052"	Standard	Chicago-Latrobe	28765A835	0000

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

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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				55 Ga.	0.052"	1 1/2"	0.32"	Expanded Round	1/8"	Four Facet	M. A. Ford	6415N142	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						55 Ga.	0.052"	1 1/2"	0.3"	Expanded Round	1/8"	Standard	M. A. Ford	2598N135	00000




								Uncoated

								55 Ga.	0.052"	1 1/2"	0.32"	Expanded Round	1/8"	Standard	M. A. Ford	2841A57	0000

Drill Bit Drawer Cabinets

Store multiple bits of each size. These cabinets have drawers marked with the sizes and decimal equivalents. They can be stacked up to three high.

					Overall
	Holds Drill Bit Sizes	For Drill Bit Length Class	No. of Compartments	No. of Drawers	Wd.	Dp.	Ht.	Material	Lock Type	No. of Keys Included	Features		Each
For Drill Bits







				For Wire Gauge Drill Bits

				60 Ga. to 1 Ga.	Jobbers, Maintenance, Short	60	5	14 5/8"	7 3/8"	7 3/4"	Steel	—	—	—	2962A2	0000000


				80 Ga. to 1 Ga.	Jobbers, Maintenance, Short	84	5	14 5/8"	7 3/8"	7 3/4"	Steel	—	—	—	2962A8	000000




						For Inch, Wire Gauge, Letter Size Drill Bits

						1/16" to 1/2" 60 Ga. to 1 Ga. A to Z	Jobbers, Maintenance, Short	159	4	26"	12"	12 1/2"	Steel	Keyed	2	Undivided bottom drawer for general storage	8922A31	000000

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.

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 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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				55 Ga.	0.052"	1 1/2"	0.6"	Round	0.052"	Four Facet	Ultra Tool	8825A515	000000




						Uncoated

						55 Ga.	0.052"	1 1/2"	0.6"	Round	0.052"	Four Facet	Ultra Tool	2860A71	00000

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 1-60 and a metal index case	60	-0.0002" to 0"	Precision Ground	2952A6	0000000

Carbide Drill Bits for Hardened Steel


Short Length Round Shank	Split

The hardest and most wear-resistant bits with the longest life. 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 stays sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. It 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.

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

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 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	Mfr.		Each
Short Length







				Titanium Nitride (TiN) Coated

				55 Ga.	0.052"	1 1/2"	0.3"	Round	0.052"	Split	Ultra Tool	8882A713	000000




						Uncoated

						55 Ga.	0.052"	1 1/2"	0.3"	Round	0.052"	Four Facet	Ultra Tool	8944A94	00000

Short-Flute High-Speed Steel Drill Bits

Extended Length

Round Shank

Standard

The rigidity of short-length bits without sacrificing reach. The shallow drilling depth makes these less likely to wobble than other bits of the same length, so they stay centered and drill straighter. High-speed steel is good for general purpose drilling in most metals.

Extended Length—Drill through panels and thick workpieces with our longest bits.

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.

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







				Black Oxide

				55 Ga.	0.052"	6"	0.79"	Round	0.052"	Standard	Chicago-Latrobe	3161A71	00000


				55 Ga.	0.052"	12"	0.79"	Round	0.052"	Standard	Chicago-Latrobe	3158A173	00000

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	Mfr.		Each
Jobbers' Length







				Uncoated

				55 Ga.	0.052"	1 7/8"	0.79"	High Helix	Round	0.052"	Standard	Chicago-Latrobe	2912A232	00000

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Standard

With flutes that spiral in the opposite direction of other bits, these are 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. High-speed steel is the versatile choice for drilling most 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					Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Mfr.		1-11	12-Up
Jobbers' Length







				Uncoated

				55 Ga.	0.052"	1 7/8"	0.77"	Round	0.052"	Standard	Chicago-Latrobe	3024A281	00000	00000

Carbide Drill Bits for Carbon Fiber, Fiberglass, and Graphite

Jobbers' Length

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.

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







				Uncoated

				55 Ga.	0.052"	1 1/2"	0.6"	Round	0.052"	140°	Brad	Fluted	Ultra Tool	2828A844	000000

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
0.052"	-0.0002" to 0"	55 Ga.	1 7/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A271	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

				55 Ga.	0.0520"	0.052"	3/16"	4"	3/16"	Steel	2864A242	000000