9/16"-18 Taps | McMaster-Carr

Repair screw threads in a wide range of sizes. The dies are hex shaped for use with conventional wrenches. The taps have a square shank that's compatible with tap wrenches and tap holders for drill presses and drilling machines. With a plug chamfer, all taps have 3-5 chamfered threads and are suitable for thread repair in both through holes and closed-end holes.

	File Sizes Included	Container Type		Each
Carbon Steel







	Right-Hand Thread

	48	1/4”-20, 1/4”-28, 5/16”-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-18, 9/16”-12, M6 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.25 mm, M12 × 1.50 mm, M12 × 1.75 mm, M10 × 1.00 mm, M11 × 1.50 mm, M14 × 1.50 mm	1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, M6 × 1.00 mm, M8 × 1.25 mm, M10 × 1.00 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.25 mm, M12 × 1.50 mm, M12 × 1.75 mm, M14 × 1.50 mm, M11 × 1.50 mm	For 11 to 24 threads per inch, For 0.75 to 3 mm thread pitches	Plastic Case	25325A15	0000000

Tap and Die Sets

Use a single set for many sizes of internal and external threads. The taps and dies are for use on most metal and plastic.

Carbon Steel—Carbon steel taps are for thread repair and occasional tapping.

High-Speed Steel—High-speed steel taps and dies last longer than carbon steel when used on similar material.

Plug Chamfer—Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes. However, they do not start threads as easily as taper-chamfer taps. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

Taper Chamfer—Taper-chamfer taps have 7-10 chamfered threads at the tip for cutting into the workpiece. They require less torque than other chamfer types, making them a good choice for starting threads and tapping through holes. However, a longer taper means that they cannot thread as close to the bottom of closed-end holes.

Hex—Hex-shaped dies are for thread repair and can be used with conventional wrenches.

	Die Shape	Die Sizes Included	Wd.	Container Type	Includes	Mfr.		Each
Carbon Steel Taps and Dies







	Right-Hand Thread

	53	6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 1/4"-18	Plug, Taper	Hex	6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-18, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16	1", 1 7/16"	Plastic Case	Die Wrench (2), Screwdriver, Tap Wrench (3), Thread Gauge	Black & Decker	25955A6	0000000


	65	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 7/8"-9, 7/8"-14, 1"-8, 1"-14, 1/4"-18	Plug, Taper	Hex	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-18, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 7/8"-14, 7/8"-9, 1"-8, 1"-14	5/8", 1", 1 7/16", 1 13/16"	Plastic Case	Die Wrench (4), Tap Wrench (4), Thread Gauge	Black & Decker	26075A71	000000


	High-Speed Steel Taps and Dies







					Right-Hand Thread

					58	6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 1/4"-18	Plug	Hex	6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/4"-18, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16	1", 1 7/16"	Plastic Case	Die Wrench (2), Extractor (5), Screwdriver, Tap Wrench (3), Thread Gauge	Viking Norseman Drill	26055A74	000000

Taps

Cut threads into holes so screws, bolts, and rods fit snugly. Our basic taps have straight flutes that are good for most jobs.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

Carbon Steel—The economical choice for occasional hand tapping. These work on most metals and plastic but will dull more quickly than other taps.

Uncoated—The economical choice, these won't last as long as coated taps.

Titanium Nitride (TiN) Coated—Run at higher speeds and last twice as long as uncoated taps.

Taper Chamfer—Good for both starting holes and threading through holes. These taps have the longest taper to gradually engage with the material, reducing the force needed to turn them. They can't reach the bottom of blind holes, however, so you will likely need to finish with a bottoming-chamfer tap.

Plug Chamfer—Our go-to chamfer type, these thread both through holes and blind holes. The tapered section is shorter than a taper chamfer and longer than bottoming chamfer. As a result, they're easier to turn than bottoming taps but require more force than taper taps.

Bottoming Chamfer—Cut all the way to the bottom of blind holes with taps that have the shortest taper. Since these require the most force to turn, they’re often used to finish holes started by taper- or plug-chamfer taps.

Number of Flutes—Taps with fewer flutes have more space to capture chips, so you won’t have to clear them as often. However, they can be more difficult to keep straight in the hole.

Taps Sold as Sets—Include one tap of each chamfer type.

	Taps															Taps Sold as Sets
						Drill Bit				Taper Chamfer		Plug Chamfer		Bottoming Chamfer
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size	Decimal Size Equiv.	Shank Type	Mfr.		Each		Each		Each	No. of Taps		Each
High-Speed Steel







				Uncoated

				9/16"-18	1 21/32"	3 19/32"	UNF	4	33/64"	0.5156"	Square	Widia	2521A666	000000	2521A686	000000	2521A726	000000	3	2521A826	000000




						Titanium Nitride (TiN) Coated

						9/16"-18	1 21/32"	3 19/32"	UNF	4	33/64"	0.5156"	Square	Viking Norseman Drill	2636A223	00000	2636A224	00000	2636A225	00000	—	———	0


						Carbon Steel







										Uncoated

										9/16"-18	1 21/32"	3 19/32"	UNF	4	33/64"	0.5156"	Square	Widell Industries	26035A216	00000	26035A236	00000	26035A256	00000	—	———	0

Tap Sets

These sets include a variety of taps for threading holes so screws, bolts, and rods fit snugly.

High-Speed Steel—Single Thread Size Sets

Taper, Plug, and Bottoming

Chamfer Set

The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic. These sets include one of each chamfer type: Taper for starting holes and threading through holes; plug for through holes and blind holes; and bottoming for cutting the closest to the bottom of any hole.

Uncoated—The economical choice, these won't last as long as coated taps.

Titanium Nitride (TiN) Coated—Run at higher speeds and last twice as long as uncoated taps.

								Taper Chamfer, Plug Chamfer, Bottoming Chamfer
	No. of Pieces	Thread Size	Thread Type	Container Type	No. of Flutes	Shank Type	Mfr.		Each
Uncoated



		3	9/16"-18	UNF	Plastic Case	4	Square	Cleveland	2521A826	000000


		Titanium Nitride (TiN) Coated



				3	9/16"-18	UNF	Plastic Case	4	Square	Viking Norseman Drill	26545A712	00000

Carbon Steel—Single Thread Size Sets

Taper, Plug, and Bottoming

Chamfer Set

The economical choice for occasional hand tapping. These work on most metals and plastic but will dull more quickly than other taps. Sets include one each chamfer type: Taper for starting holes and through holes; plug for through holes and blind holes; and bottoming for cutting the closest to the bottom of any hole.

								Taper Chamfer, Plug Chamfer, Bottoming Chamfer
	No. of Pieces	Thread Size	Thread Type	Container Type	No. of Flutes	Shank Type	Mfr.		Each
Uncoated



		3	9/16"-18	UNF	Plastic Case	4	Square	Widell Industries	26035A376	000000

Carbon Steel—Multiple Thread Size Sets

Plug Chamfer Set

The economical choice for occasional hand tapping. These work on most metals and plastic but will dull more quickly than other taps. Sets include multiple sizes of plug chamfer taps for through holes and blind holes.

							Taper Chamfer, Plug Chamfer, Bottoming Chamfer
	No. of Pieces	Thread Size	Thread Type	Container Type	Shank Type	Mfr.		Each
Uncoated



		60	3 each of sizes 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 7/8"-9, 7/8"-14, 1"-8, and 1"-12	UNF, UNC	Plastic Case	Square	ICS	2688A11	0000000

Tap Extractor Sets for Screw Thread Taps

To extract taps of different sizes, these sets include multiple extractors. Fingers on the extractor grip the flutes on a broken tap. Use with a tap wrench to remove taps with straight flutes from the workpiece.

No. of Pieces	For Three-Flute Tap Size	For Four-Flute Tap Size	Material	Container Type	For Number of Tap Flutes		Each
6	—	No. 14, 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2", 9/16", 5/8", M6, M6.3, M7, M8, M9, M10, M11, M12, M12.5, M14, M16	Steel	Plastic Case	4	2561A422	0000000
6	—	5/16", 11/32", 3/8", 7/16", 15/32", 1/2", 9/16", 5/8", M7, M8, M9, M10, M11, M12, M12.5, M14, M16	Steel	Plastic Case	4	2561A423	000000
11	No. 5, No. 6, 1/8", M3, M3.5	No. 8, No. 10, No. 12, No. 14, 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", M4, M4.5, M5, M5.5, M6, M6.3, M7, M8, M9, M10, M11, M12, M12.5, M14, M16, M18, M19, M20, M22, M24, M25	Steel	Plastic Case	3, 4	2561A424	000000
13	No. 4, No. 5, No. 6, 1/8", M3, M3.5	No. 8, No. 10, No. 12, No. 14, 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2", 9/16", 5/8", 11/16", 3/4", M4, M4.5, M5, M5.5, M6, M6.3, M7, M8, M9, M10, M11, M12, M12.5, M14, M16, M18, M19, M20	Steel	Plastic Case	3, 4	2561A425	000000
15	No. 4, No. 5, No. 6, 1/8", M3, M3.5	No. 8, No. 10, No. 12, No. 14, 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", M2, M4, M4.5, M5, M5.5, M6, M6.3, M7, M8, M9, M10, M11, M12, M12.5, M14, M16, M18, M19, M20, M22, M24, M25	Steel	Plastic Case	3, 4	2561A426	000000

Chip-Clearing Taps

Spiral-Point Flute for Through Holes

Remove long, stringy chips to produce cleaner threads than standard taps. The flute design prevents buildup to protect the quality of the threads and avoid damage to the tap. Since you don’t need to reverse these taps to extract chips, they also create threads faster.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

Uncoated—The economical choice, these won't last as long as coated taps.

Titanium Nitride (TiN) Coated—Run at higher speeds and last twice as long as uncoated taps.

Titanium Carbon Nitride (TiCN) Coated—Resist heat, chipping, and wear for three times the life of uncoated taps.

Spiral-Point Flute for Through Holes—Push chips ahead of the tap and out of through holes. Also known as gun taps.

Plug Chamfer—Our go-to chamfer type. With a longer taper than a bottoming chamfer, they are easier to turn but won't thread as close the bottom of a hole.

					Drill Bit				Spiral-Point Flute for Through Holes
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	Size	Decimal Size Equiv.	Shank Type	Mfr.	Chamfer Type	No. of Flutes		Each
High-Speed Steel







				Uncoated

				9/16"-18	1 21/32"	3 19/32"	UNF	33/64"	0.509"	Square	GWS	Plug	3	25705A13	000000




						Titanium Nitride (TiN) Coated

						9/16"-18	1 21/32"	3 19/32"	UNF	33/64"	0.509"	Square	GWS	Plug	3	2703A158	00000




								Titanium Carbon Nitride (TiCN) Coated

								9/16"-18	1 21/32"	3 19/32"	UNF	33/64"	0.509"	Square	GWS	Plug	3	2703A128	00000

Chip-Clearing Taps for Steel and Stainless Steel

Spiral-Point Flute for Through Holes

Made of a high-vanadium alloy, these taps are harder and more wear-resistant than other high-speed steel taps. The flute design prevents buildup to protect the quality of the threads and avoid damage to the tap. Since you don’t need to reverse these taps to extract chips, they also create threads faster.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these taps can last 50% longer than uncoated taps.

Spiral-Point Flute for Through Holes—Push chips ahead of the tap and out of through holes. Also known as gun taps.

Plug Chamfer—Our go-to chamfer type. With a longer taper than a bottoming chamfer, they are easier to turn but won't thread as close the bottom of a hole.

					Drill Bit				Spiral-Point Flute for Through Holes
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	Size	Decimal Size Equiv.	Shank Type	Mfr.	Chamfer Type	No. of Flutes		Each
High-Speed Steel







				Black Oxide

				9/16"-18	1"	3 19/32"	UNF	33/64"	0.5156"	Square	Widia	Plug	3	2684A86	000000

Left-Hand Thread Taps

Create left-hand threads that prevent counter-clockwise rotating parts, such as flywheels and propellers, from loosening and spinning off. These taps have straight flutes that are good for most jobs.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

Uncoated—The economical choice, these won't last as long as coated taps.

						Drill Bit				Taper Chamfer		Plug Chamfer
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size	Decimal Size Equiv.	Shank Type	Mfr.		Each		Each
High-Speed Steel







				Uncoated

				9/16"-18	1 21/32"	3 19/32"	UNF	4	33/64"	0.5156"	Square	Regal Cutting Tools	———	0	2584A372	000000


				9/16"-18	1 21/32"	3 19/32"	UNF	4	33/64"	0.5156"	Square	Widia	2584A592	000000	———	0

Chip-Clearing Taps for Nickel

Spiral Flute for Through Holes

Avoid heat buildup that can deform material and prematurely wear taps when threading nickel alloys. The body on these taps narrows closer to the flutes for better coolant flow and less contact with the workpiece. Spiral flutes prevent stuck chips that can slow you down and decrease the quality of the threads.

Cobalt Steel—Tough and wear resistant, cobalt taps last twice as long as high-speed steel. They also can run at higher temperatures without damage to their cutting edges.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these taps can last 50% longer than uncoated taps.

Spiral Flute for Through Holes—Left-hand flutes push chips ahead of the tap and out of through holes.

Plug Chamfer—Our go-to chamfer type. With a longer taper than a bottoming chamfer, they are easier to turn but won't thread as close the bottom of a hole.

					Drill Bit				Spiral Flute for Through Holes
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	Size	Decimal Size Equiv.	Shank Type	Mfr.	Chamfer Type	No. of Flutes		Each
Cobalt Steel







				Black Oxide

				9/16"-18	27/32"	3 19/32"	UNF	33/64"	0.5156"	Square	Widia	Plug	4	25595A66	000000

Long-Reach Taps

Thread holes that are hard to access or where obstructions make it difficult to turn a tap wrench. About twice as long other taps, these get you inside machines or through assemblies such as pulleys and belts. They have straight flutes that are good for most jobs.

High-Speed Steel—The most versatile taps resist heat and wear to stay sharp. They’re good for most metals and plastic.

						Drill Bit		Shank			Taper Chamfer		Plug Chamfer		Bottoming Chamfer
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size, mm	Decimal Size Equiv.	Type	Dia.	Mfr.		Each		Each		Each
High-Speed Steel







				Uncoated

				9/16"-18	1 21/32"	6"	UNF	4	13	0.5118"	Square	0.429"	Regal Cutting Tools	2582A474	000000	2582A416	000000	2582A448	000000

Helical Threaded Inserts with Installation Tools

Drill Bit, Installation Tool

and Through-Hole Tap

Quickly restore stripped threads—these inserts come with through-hole taps and installation tools. The tough coils on these inserts expand once installed to anchor in a tapped hole.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.

	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
Pronged







	18-8 Stainless Steel

	9/16"-18	0.844"	37/64"	0.578"	6	Drill Bit Installation Tool Through-Hole Tap	91732A337	0000000

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, these taps aren’t rated for impact drivers. With a drill bit point to drive into the workpiece, they 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.

These taps 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.

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	Hex Shank Size	Mfr.		Each
Uncoated High-Speed Steel



		9/16"-18	1 5/8"	5 1/2"	33/64"	0.509"	118°	Spiral	4	UNF	H3	1/4"	GWS	3464A65	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				9/16"-18	1 5/8"	5 1/2"	33/64"	0.509"	118°	Spiral	4	UNF	H3	1/4"	GWS	3464A135	00000

Tap Extractors for Screw Thread Taps

Fingers on the extractor grip the flutes on a broken tap. Use with a tap wrench to remove taps with straight flutes from the workpiece without damaging the surrounding threads.

Tap Extractors						Replacement Tap Extractor Fingers
For Tap Size	Material	Square Shank Size	Choose a Number of Tap Flutes		Each	Choose a Number of Tap Flutes	Pkg. Qty.		Pkg.
9/16", M14	Steel	0.33"	3, 4	2561A536	000000	3, 4	12	2561A561	000000

Helical Insert Taps

Match the size of helical inserts so they fit tightly when installed in the hole.

High-Speed Steel—These taps resist heat and wear to stay sharp.

Plug Chamfer—Our go-to chamfer type. With a longer taper than a bottoming chamfer, they are easier to turn but won't thread as close the bottom of a hole.

						Drill Bit				Plug Chamfer		Bottoming Chamfer
	For Insert Size	Thread Lg.	Overall Lg.	For Insert Thread Type	No. of Flutes	Size	Decimal Size Equiv.	Shank Type	Mfr.		Each		Each
High-Speed Steel







				Uncoated

				9/16"-18	1 13/16"	3 13/16"	UNF	4	37/64"	0.5781"	Square	Heli-Coil	91709A157	000000	91709A470	0000000