27/64" Drill Bits | McMaster-Carr


Jobbers' Length Round Shank	Jobbers' Length Morse Taper Shank	Short Length Round Shank

Maintenance Length Round Shank 3-Flat Shank	Extended Length Round Shank


Standard	Split

Our basic drill bits are also the most versatile. Cut holes in a variety of metals, from the softest aluminum to the hardest steel.

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.

Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ bits.

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.

Titanium Aluminum Nitride (TiAlN) Coated—The hardest and most wear-resistant coating, especially at high temperatures. These bits are best for hard and abrasive materials, such as iron and titanium.

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







				Black Oxide

				27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	1	2901A136	000000


				27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	6	2901A587	00000
				27/64"	0.4219"	7 1/4"	3.24"	Morse Taper	Morse 1	Standard	1	2929A359	00000




						Titanium Nitride (TiN) Coated

						27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	1	29115A736	00000


						27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	6	29115A836	000000




								Titanium Aluminum Nitride (TiAlN) Coated

								27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	1	3202A69	00000




										Uncoated

										27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Standard	1	8870A39	0000


										27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Standard	6	8870A139	00000


										Short Length







														Black Oxide

														27/64"	0.4219"	3 3/8"	1.36"	Round	27/64"	Split	1	2896A37	00000


														27/64"	0.4219"	3 3/8"	1.36"	Round	27/64"	Split	6	2896A175	00000




																Titanium Nitride (TiN) Coated

																27/64"	0.4219"	3 3/8"	1.36"	Round	27/64"	Split	1	2908A56	00000


27/64"	0.4219"															3 3/8"	1.36"	Round	27/64"	Split	3	2908A93	00000




		Uncoated

		27/64"	0.4219"													3 3/8"	1.36"	Round	27/64"	Standard	1	8947A136	0000


		Maintenance Length







																Gold Oxide

																27/64"	0.4219"	4 1/2"	2.75"	Round/3-Flat	27/64"	Split	1	87755A46	00000


																Extended Length







																		Black Oxide

								27/64"										0.4219"	7 1/4"	3.99"	Round	27/64"	Standard	1	29315A148	00000




																		Titanium Nitride (TiN) Coated

																		27/64"	0.4219"	7 1/4"	4.63"	Round	27/64"	Standard	1	28965A752	00000




											Uncoated

											27/64"								0.4219"	12"	8.15"	Round	27/64"	Standard	1	2939A32	00000


											27/64"	0.4219"	18"						12.15"	Round	27/64"	Standard	1	2955A27	00000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Jobbers' Length

Morse Taper Shank

Jobbers' Length

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







				Titanium Nitride (TiN) Coated

				27/64"	0.4219"	5 3/8"	3.94"	Round	27/64"	Split	27995A536	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						27/64"	0.4219"	5 5/8"	3.07"	Round	27/64"	Split	2753A148	00000




								Uncoated

								27/64"	0.4219"	5 3/8"	2.81"	Hex	27/64"	Split	4909N27	00000


								27/64"	0.4219"	5 3/8"	3.3"	Round	27/64"	Split	3069A37	00000
								27/64"	0.4219"	7 3/4"	3.88"	Morse Taper	Morse 2	Split	3068A56	00000


								Short Length







												Titanium Nitride (TiN) Coated

												27/64"	0.4219"	3 3/8"	1.36"	Round	27/64"	Split	2416A36	00000




														Uncoated

														27/64"	0.4219"	3 3/8"	1.36"	Round	27/64"	Split	28765A36	00000

Chip-Clearing Tap and Drill Bit Sets for Through Holes

Also known as gun taps, the taps in these sets have spiral-point flutes that push chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent buildup, they produce threads more efficiently than standard taps and are suitable for production work. Taps have a square shank for compatibility with tap wrenches and tap holders for drill presses and milling machines. With a plug chamfer, they have 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. All taps and drill bits are made of high-speed steel for use on most metal and plastic.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
Uncoated High-Speed Steel Tap



	18	Plug	6-32 8-32 10-24 10-32 1/4"-20 5/16"-18 3/8"-16 7/16"-14 1/2"-13	2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 5/32" 3 3/8"	UNC, UNF	2, 3	H3	27/64" 5/16" 36 ga. 29 ga. 25 ga. 21 ga. 7 ga. F U	Black-Oxide High-Speed Steel	Metal Case	27275A27	0000000

Carbide Drill Bits


Jobbers' Length Round Shank	Short 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.

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.

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 Nitride (TiN) Coated

				27/64"	0.4219"	4 1/2"	2.3"	Round	27/64"	Four Facet	27515A68	0000000




						Titanium Aluminum Nitride (TiAlN) Coated

						27/64"	0.4219"	4 1/2"	2.3"	Round	27/64"	Four Facet	8879A89	000000




								Uncoated

								27/64"	0.4219"	4 1/2"	2.3"	Round	27/64"	Four Facet	2956A36	000000


								Short Length







												Uncoated

												27/64"	0.4219"	3"	1"	Round	27/64"	Four Facet	2956A73	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank

Short Length

Round Shank

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







				Uncoated

				27/64"	0.4219"	5 3/8"	3.2"	Round	27/64"	Standard	2940A34	000000


				27/64"	0.4219"	5 3/8"	3.2"	Round	27/64"	Split	31575A26	00000


				Short Length







								Uncoated

								27/64"	0.4219"	3 1/2"	1.26"	Round	27/64"	Standard	28805A232	00000


								27/64"	0.4219"	3 1/2"	1.26"	Round	27/64"	Split	2750A32	00000


								Extended Length







												Uncoated

												27/64"	0.4219"	7 1/4"	3.78"	Round	27/64"	Standard	29465A32	00000

Reduced-Shank High-Speed Steel Drill Bits

Jobbers' Length


Standard	Split

Cut large holes with drill presses and portable drills that have a standard-size chuck. The shank on these bits has a smaller diameter than the cutting tip. High-speed steel is good for general purpose drilling in most metals. Also known as Silver and Deming bits.

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

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		Each
Jobbers' Length







				Black Oxide

				27/64"	0.4219"	4 5/8"	2.84"	Reduced Round	1/4"	Standard	3038A22	000000


				27/64"	0.4219"	5 3/8"	3.94"	Reduced Round	3/8"	Split	8773A53	00000

Drill Bit Size Gauges

For Inch

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
Inch	Drills	1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2"	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	8986A67	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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				27/64"	0.4219"	5 1/2"	1.68"	Round	27/64"	Notched	2973A36	000000

Drill Bit Guides

Place these guides on your workpiece to drill precise holes without building a fixture. They'll even work on corners and round surfaces. Lines marked on the side allow you to align your holes accurately. Made of hardened steel, they’re tough enough to withstand frequent use.

For Drill Bit Size	For Drill Bit Size Decimal Equiv.	Lg.	Wd.	Ht.	Material		Each
3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2"	0.375", 0.3906", 0.4063", 0.4219", 0.4375", 0.4531", 0.4688", 0.4844", 0.5"	5 1/4"	1"	7/8"	Steel	9550T16	000000

Short-Flute High-Speed Steel Drill Bits

Extended Length

Round Shank

Split

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		Each
Extended Length







				Black Oxide

				27/64"	0.4219"	6"	3.3"	Round	27/64"	Split	2986A37	000000


				27/64"	0.4219"	12"	3.3"	Round	27/64"	Split	2986A72	00000

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.

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







				Titanium Nitride (TiN) Coated

				27/64"	0.4219"	5 1/2"	3.6"	Parabolic	Round	27/64"	Split	3183A66	000000




						Uncoated

						27/64"	0.4219"	5 1/2"	3.6"	Parabolic	Round	27/64"	Split	29925A936	00000

Chip-Clearing High-Speed Steel Drill Bits


Jobbers' Length High Helix Flute Round Shank	Jobbers' Length Parabolic Flute Round Shank

Standard

Split

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.

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 deeper holes.

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

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







				Black Oxide

				27/64"	0.4219"	5 3/8"	3.09"	Parabolic	Round	27/64"	Split	29925A36	000000


				27/64"	0.4219"	5 5/8"	2.84"	High Helix	Round	27/64"	Split	31115A66	00000




						Titanium Nitride (TiN) Coated

						27/64"	0.4219"	5 3/8"	3.09"	Parabolic	Round	27/64"	Split	29925A76	00000




								Uncoated

								27/64"	0.4219"	5 3/8"	3.09"	Parabolic	Round	27/64"	Split	2754A66	00000


								27/64"	0.4219"	5 3/8"	3.3"	High Helix	Round	27/64"	Standard	2912A136	00000

High-Speed Steel Drill Bits for Plastic

The precision-ground, 60° point penetrates gradually to prevent cracking and chipping. It also reduces heat that can deform the material. Use these bits for drilling into acrylic, laminate, and other plastics. They're made of wear-resistant high-speed steel.

Jobbers' Length About Jobbers' Length

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Angle	Drill Bit Point Type		Each
Uncoated



		27/64"	0.4219"	5 3/8"	3.94"	Round	27/64"	60°	Standard	27465A65	000000

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		Each
Jobbers' Length







				Uncoated

				27/64"	0.4219"	4 1/2"	2.3"	Round	27/64"	140°	Brad	Fluted	2828A25	0000000

Smooth-Finish Carbide Drill Bits


Jobbers' Length Round Shank	Split

With more cutting edges than other drill bits, these cut continuously and consistently for a smoother finish. They also stay centered to produce holes that are straighter and more accurate. However, since there’s less space between the cutting edges, they don’t clear chips as quickly. Made of carbide, these are the hardest and most wear-resistant drill bits you can buy. 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 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

				27/64"	0.4219"	4 1/2"	2.3"	Round	27/64"	Split	3171A26	0000000

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Split

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		1-5	6-Up
Jobbers' Length







				Uncoated

				27/64"	0.4219"	5 3/8"	3.09"	Round	27/64"	Split	2876A381	000000	000000

Short-Flute Carbide-Tipped Drill Bits

Extended Length

Round Shank

Split

Our strongest short-flute bits, these have a carbide tip that stays sharp when drilling abrasive materials, such as titanium. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter.

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

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







				Uncoated

				27/64"	0.4219"	6"	3.94"	Round	27/64"	Split	2854A72	000000


				27/64"	0.4219"	12"	3.22"	Round	27/64"	Split	2854A31	00000

Short-Flute Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Split

These bits combine the toughness and wear resistance of cobalt with short flutes for rigidity. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter. 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.

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

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				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-4	5-Up
Jobbers' Length







				Black Oxide

				27/64"	0.4219"	5 3/8"	1.37"	Round	27/64"	Split	3146A137	000000	000000

Quick-Change Hex Shank Drill Taps for Drills and Screwdrivers

Save time when you need to change drill taps frequently. The grooved shank snaps directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank. However, they’re not rated for impact drivers. With a drill bit point to drive into the workpiece, these taps can drill and tap holes in a single step. They’re made of high-speed steel and are for use on most metal and plastic.

Their spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. All have a plug chamfer with 3-5 chamfered cutting threads, so they’re suitable for start-to-finish tapping.

Uncoated High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium Nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

	Thread			Drill Bit								Plug Chamfer
	Size	Lg.	Overall Lg.	Size	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit	Hex Shank Size		Each
Uncoated High-Speed Steel



		1/2"-13	1 3/8"	5 1/16"	27/64"	0.4219"	118°	Spiral	2	UNC	H3	1/4"	3464A63	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				1/2"-13	1 3/8"	5 1/16"	27/64"	0.4219"	118°	Spiral	2	UNC	H3	1/4"	3464A124	00000

Thread-Locking Threaded Inserts with Installation Tools

What you need to add or repair threads quickly in parts under stress or vibration. These inserts come with a closed-end tap, a drill bit, and an installation bit. Also known as E-Z Lok, they have Loctite® adhesive already applied, and the adhesive reaches full strength after 72 hours.

Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.

Black Phosphate-Coated Steel—These inserts resist occasional moisture.

	Drill Bit Size	For Max. Hole Dia.	Drive Style	No. of Inserts Included		Each
Standard Wall







	Black Phosphate-Coated Steel

	5/16"-18	1/2"-13	0.484"	27/64"	0.422"	Slotted	10	95109A112	000000

Chip-Clearing High-Speed Steel Drill Bits for Aluminum, Brass, and Bronze

Jobbers' Length

Low Helix Flute

Round Shank

Standard

Designed for soft metals that can gum up other drill bits, wide flutes lift chips out of the hole. This prevents clogs that can weaken and damage the bit and ruin the hole. Also known as slow spiral bits, these are made of versatile high-speed steel.

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.	Flute Type	Type	Size	Drill Bit Point Type		1-5	6-Up
Jobbers' Length







				Uncoated

				27/64"	0.4219"	5 3/8"	3.09"	Low Helix	Round	27/64"	Standard	2928A236	000000	000000

Depth-Limiting Drill Stops

Image of ProductInUse. Front orientation. Drill Stops.

Ensure identical hole depths every time. Position the collar on your bit and tighten the set screw.

	For Drill Bit Size Decimal Equiv.	Overall Lg.	OD	Hex Key Size for Set Screw	Material		Each
For Inch Drill Bits



	27/64"	0.4219"	7/8"	7/8"	1/8"	Steel	8865A227	00000

Drill Taps

Spiral Flute

Drill holes and cut threads without switching tools. Made of high-speed steel, these taps are for use on most metal and plastic. The square shank is compatible with tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.

Uncoated High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium Nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

Spiral Flute—Taps with spiral flutes keep chips clear by drawing them back toward the tap and out of the hole.

	Thread			Drill Bit							Plug Chamfer
	Size	Lg.	Overall Lg.	Size	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel



		1/2"-13	1 3/8"	4 1/16"	27/64"	0.4219"	110°	Spiral	2	UNC	H3	2748A57	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				1/2"-13	1 3/8"	4 1/16"	27/64"	0.4219"	118°	Spiral	2	UNC	H3	2748A91	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 1/16"-1/2" (×1/64ths increments) and a metal index case	29	-0.0002" to 0"	Precision Ground	2952A5	0000000

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
0.4219"	-0.0002" to 0"	27/64"	5 3/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	3009A139	000000

Tight-Tolerance Water-Hardening W1 Tool Steel Rods

Ready for turning in your lathe, these rods are precision ground and held to strict diameter and straightness tolerances. Also known as drill rod. With far less alloy content than other tool steel, W1 is the most machinable we offer. These rods are often used to make hammers, files, and reamers—tools that don't require the dimensional stability of A2 or O1. These rods are also decarb-free, which means any surface flaws created during the manufacturing process have been removed. This makes them even more machinable and leads to better results from heat treating or finishing. Heat treat the surface for extra wear resistance. Or, quench this steel in water to boost its hardness and strength, giving it a sharper, more durable edge for small tools.

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	Fabrication	Heat Treatment	Yield Strength, psi	Mechanical Finish	Hardness	Max. Hardness After Heat Treatment	Specs. Met		3 ft. Long	6 ft. Long
0.4218"	-0.001" to 0.001"	27/64"	Hot Rolled	Annealed	50,000	Precision Ground	Rockwell B95 (Medium)	Rockwell C65	ASTM A686	8890K259	000000	000000