1/8 NPT Taps | McMaster-Carr

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1/8, 1/4, 3/8, 1/2, 3/4, and 1

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26 Products

Tap, Die, and Drill Bit Sets

Cut and repair threads and drill holes in many different sizes. Tap and die wrenches are included. The dies are hex shaped for use with conventional wrenches. The taps are made of carbon steel and are recommended for thread repair and occasional tapping.

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.

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 chamfers. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

	Drill Bit Sizes Included	Container Type	Includes	Tap Chamfer Type		Each
Carbon Steel







	Right-Hand Thread

	117	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 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, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, M12 × 1.75 mm	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 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, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, M12 × 1.75 mm	5/64", 7/64", 5/32", 1/4", 19/64", 5/16", 21/64", 3/8", 25/64", 13/32", 27/64", 29/64", 43 ga., 39 ga., 36 ga., 30 ga., 29 ga., 25 ga., 21 ga., 20 ga., 16 ga., 9 ga., 7 ga., 3 ga., B, F, H, I, J, O, Q, R, S, U, Z	Plastic Case	Die Wrench (2), Extractor (5), Tap Wrench (3), Thread Gauge (2)	Taper, Plug	82955A11	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		Each
Carbon Steel Taps and Dies







	Right-Hand Thread

	12	1/8, 1/4, 3/8, 1/2, 3/4, 1	Taper	Hex	1/8"-27, 1/4"-18, 3/8"-18, 1/2"-14, 3/4"-14, 1"-11 1/2	1 1/16", 1 1/4", 1 7/16", 1 5/8", 2", 2 3/8"	Plastic Case	—	2549A76	0000000


	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	Plug, Taper	Hex	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	1"	Plastic Case	Die Wrench, Tap Wrench	2631A5	000000
	40	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	Plug, Taper	Hex	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	5/8", 1"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	2625A12	000000
	40	6-32, 8-32, 10-24, 1/8"-27, 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, M4 × 0.75 mm, M5 × 0.80 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.75 mm	Plug, Taper	Hex	6-32, 8-32, 10-24, 1/8"-27, 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, M4 × 0.75 mm, M5 × 0.80 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.75 mm	5/8", 1"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	2668A36	000000
	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	25955A6	000000
	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	26075A71	000000


	High-Speed Steel Taps and Dies







					Right-Hand Thread

					40	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	Plug	Hex	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	1"	Plastic Case	Die Wrench, Screwdriver, Tap Wrench (3), Thread Gauge	26055A64	000000


					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	26055A74	000000


					High-Speed Steel Taps and Carbon Steel Dies







									Right-Hand Thread

									12	1/8, 1/4, 3/8, 1/2, 3/4, 1	Taper	Hex	1/8"-27, 1/4"-18, 3/8"-18, 1/2"-13, 3/4"-14, 1"-11 1/2	25/32", 1 1/16", 1 1/4", 1 5/8", 1 13/16", 2 3/16"	Plastic Case	—	2549A78	000000

Pipe and Conduit Taps

Add internal threads to pipe and conduit or components such as manifolds. They have straight flutes that are good for most jobs.

NPT Thread About NPT Thread

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

Cobalt Steel—These taps resist higher temperatures and and last twice as long as high-speed steel taps. They thread hard materials such as iron and hardened steel without damaging their cutting edges.

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.

						Drill Bit			Plug Chamfer
	Pipe Size	Thread Lg.	Overall Lg.	No. of Flutes	Threads per In.	Size	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				1/8	3/4"	2 1/8"	4	27	Q	0.332"	Square	2525A169	000000


				1/8	3/4"	3"	4	27	Q	0.332"	Square	2538A41	00000




						Titanium Nitride (TiN) Coated

						1/8	3/4"	2 1/8"	4	27	Q	0.332"	Square	2652A11	00000


						Cobalt Steel







										Uncoated

										1/8	3/4"	2 1/8"	4	27	Q	0.332"	Square	2662A36	00000


										Carbon Steel







														Uncoated

														1/8	3/4"	2 1/8"	4	27	R	0.339"	Square	2525A112	00000

Pipe and Conduit Tap Sets

A range of sizes for adding internal threads to pipe and conduit. These taps can also be used to thread components like manifolds. 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.

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

	Pipe Size	Thread Type	Chamfer Type	No. of Flutes	Container Type	Shank Type		Each
High-Speed Steel



	6	1/8, 1/4, 3/8, 1/2, 3/4, 1	NPT	Plug	4, 5	Fabric Pouch	Square	2765A43	0000000


	6	1/8, 1/4, 3/8, 1/2, 3/4, 1	NPT	Plug	4, 5	Wood Case	Square	2765A44	000000


	Carbon Steel



			6	1/8, 1/4, 3/8, 1/2, 3/4, 1	NPT	Plug	4, 5	Fabric Pouch	Square	2765A42	000000

Chip-Clearing Pipe and Conduit Taps for Steel and Stainless Steel

Made of a high-vanadium alloy, these taps are harder and more wear-resistant than other high-speed steel taps. The widely spaced flutes prevent buildup that can ruin threads and keep pipe and conduit from making strong connections. Also known as interrupted-thread taps.

NPT Thread About NPT Thread

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.

						Drill Bit			Plug Chamfer		Bottoming Chamfer
	Pipe Size	Thread Lg.	Overall Lg.	No. of Flutes	Threads per In.	Size	Decimal Size Equiv.	Shank Type		Each		Each
High-Speed Steel







				Uncoated

				1/8	3/4"	2 5/32"	3	27	21/64"	0.332"	Square	———	0	2663A65	000000


				Cobalt Steel







								Titanium Nitride (TiN) Coated

								1/8	3/4"	2 1/8"	4	27	Q	0.332"	Square	2663A38	000000	———	0




										Titanium Carbon Nitride (TiCN) Coated

										1/8	3/4"	2 1/8"	3	27	Q	0.332"	Square	2662A226	000000	———	0

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
	For Insert Size	Thread Lg.	Overall Lg.	For Insert Thread Type	No. of Flutes	Size	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				1/8	1 1/16"	2 7/16"	NPT	4	W	0.386"	Square	91711A251	000000

Long-Reach Pipe and Conduit Taps

Reach into the deep recesses of your system and bypass obstructions to thread pipe and conduit. These are twice as long as standard taps but with the same shank diameter, so you don’t need a different holder. They have straight flutes that are good for most jobs.

NPT Thread About NPT Thread

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

						Drill Bit			Plug Chamfer
	Pipe Size	Thread Lg.	Overall Lg.	No. of Flutes	Threads per In.	Size	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				1/8	3/4"	6"	4	27	Q	0.332"	Square	2538A31	000000

Chip-Clearing Pipe and Conduit Taps for Aluminum, Brass, and Bronze

Slightly hooked cutting teeth grab and remove long chips from the hole. These taps prevent buildup from soft metals that can ruin threads and keep pipe and conduit from making strong connections.

NPT Thread About NPT Thread

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

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

						Drill Bit			Plug Chamfer
	Pipe Size	Thread Lg.	Overall Lg.	No. of Flutes	Threads per In.	Size	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				1/8	3/4"	2 1/8"	4	27	Q	0.332"	Square	2654A11	000000

Chip-Clearing Pipe and Conduit Taps

With widely spaced flutes, chips fall away from the tap and plenty of lubricant flows to the workpiece. These taps prevent buildup that can ruin threads and keep pipe and conduit from making strong connections. Also known as interrupted-thread taps.

NPT Thread About NPT Thread

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			Plug Chamfer
	Pipe Size	Thread Lg.	Overall Lg.	No. of Flutes	Threads per In.	Size	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				1/8	3/4"	2 1/8"	5	27	Q	0.332"	Square	2525A191	000000

Helical Threaded Inserts for Pipe Threads with Installation Tools

Fix stripped pipe threads fast—these inserts come with drill bits, through-hole taps, and installation tools. Also known as Heli-Coil inserts.

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 NPT Thread







	18-8 Stainless Steel

	1/8	0.273"	3/8"	0.375"	12	Drill Bit Installation Tool Through-Hole Tap	91733A421	0000000