M18 Taps | McMaster-Carr

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		Each
Uncoated



		3	M18 × 1 mm	Metric	Plastic Case	4	Square	26015A446	0000000


		3	M18 × 1.5 mm	Metric	Plastic Case	4	Square	26015A447	000000
		3	M18 × 2.5 mm	Metric	Plastic Case	4	Square	8305A542	000000


		Titanium Nitride (TiN) Coated



				3	M18 × 1 mm	Metric	Plastic Case	4	Square	26475A256	000000


				3	M18 × 1.5 mm	Metric	Plastic Case	4	Square	26475A259	000000
				3	M18 × 2.5 mm	Metric	Plastic Case	4	Square	26475A26	000000

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		Each
Uncoated



		3	M18 × 2.5 mm	Metric	Plastic Case	4	Square	26015A542	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.

						Plug Chamfer
	No. of Pieces	Thread Size	Thread Type	Container Type	Shank Type		Each
Uncoated



		113	5 each of sizes M3 × 0.50 mm, M3 × 0.60 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm; M12 × 1.25 mm, M12 × 1.50 mm, and M12 × 1.75 mm, 1 each of sizes M14 × 1.25 mm, M14 × 1.50 mm; M5 × 0.90 mm, M6 × 1.00 mm, M6.3 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm; M9 × 0.75 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.00 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm; M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 2.50 mm, M20 × 2.50 mm, and M24 × 3.00 mm	Metric	Plastic Case	Square	2688A13	0000000

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.

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.

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	JIS Tap Class	No. of Flutes	Size	Decimal Size Equiv.	Shank Type		Each		Each		Each	No. of Taps		Each
High-Speed Steel







				Uncoated

				M18 × 1 mm	1 13/16"	4 1/32"	Metric	—	4	17 mm	0.6693"	Square	26015A271	000000	26015A272	000000	26015A273	000000	3	26015A446	0000000


				M18 × 1.5 mm	1 13/16"	4 1/32"	Metric	—	4	16.5 mm	0.6496"	Square	26015A281	00000	26015A282	00000	26015A283	00000	3	26015A447	000000
				M18 × 2 mm	1 29/64"	3 15/16"	Metric	2	4	41/64"	0.6406"	Square	———	0	3192N315	00000	———	0	—	———	0
				M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	—	4	15.5 mm	0.6102"	Square	8305A24	00000	8305A44	00000	8305A64	00000	3	8305A542	000000




						Titanium Nitride (TiN) Coated

						M18 × 1 mm	1 13/16"	4 1/32"	Metric	—	4	17 mm	0.6693"	Square	26475A466	00000	26475A566	00000	26475A866	00000	3	26475A256	000000


						M18 × 1.5 mm	1 13/16"	4 1/32"	Metric	—	4	16.5 mm	0.6496"	Square	26475A469	00000	26475A569	00000	26475A869	00000	3	26475A259	000000
						M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	—	4	15.5 mm	0.6102"	Square	26475A47	00000	26475A57	00000	26475A87	00000	3	26475A26	000000


						Cobalt Steel







										Uncoated

										M18 × 1.5 mm	1 11/64"	4"	Metric	—	4	16.5 mm	0.6496"	Square	———	0	2662A116	00000	———	0	—	———	0


										M18 × 2.5 mm	1 11/64"	4"	Metric	—	4	15.5 mm	0.6102"	Square	———	0	2662A117	00000	———	0	—	———	0

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.

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

	25	M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, M24 × 3.00 mm	Plug	Hex	M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, M24 × 3.00 mm	1 7/16", 1 13/16"	Plastic Case	Die Wrench (2), Tap Wrench	26025A42	0000000


	52	1/4"-19, 1/8"-28, 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 × 1.25 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, M14 × 1.25 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm	Plug, Taper	Hex	1/8"-28, 1/4"-19, 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 × 1.25 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, M14 × 1.25 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm	1", 1 7/16"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	2726A66	000000
	65	1/8"-28, 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, M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, M24 × 3.00 mm	Plug, Taper	Hex	1/8"-28, 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, M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, M24 × 3.00 mm	5/8", 1", 1 3/16", 1 7/16", 1 13/16"	Plastic Case	Die Wrench (4), Tap Wrench (4), Thread Gauge	2726A68	000000

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
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	0000000
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

Thread Repair Tools for Spark Plugs

Attach these tools to a socket wrench to restore rusted and damaged spark plug threads in two common sizes.

	Thread
	Size (Type)	Lg.	Overall Lg.	No. of Flutes		Each
Black-Oxide Steel



		M14 × 1.25 mm (Metric) M18 × 1.5 mm (Metric)	5/8" 5/8"	2 9/16"	3	5088N11	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, mm	Decimal Size Equiv.	Shank Type	Chamfer Type	No. of Flutes		Each
High-Speed Steel







				Uncoated

				M18 × 1.5 mm	1.09"	4.03"	Metric	16.5	0.6496"	Square	Plug	3	2523A91	0000000


				M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	15.5	0.6102"	Square	Plug	3	8302A24	00000




						Titanium Nitride (TiN) Coated

						M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	15.5	0.6102"	Square	Plug	3	2703A81	00000




								Titanium Carbon Nitride (TiCN) Coated

								M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	15.5	0.6102"	Square	Plug	3	2605A31	000000

Trapezoidal Thread Taps

The metric version of Acme thread taps. These cut the broad threads found on lead screw nuts, linear actuators, vises, and other moving components. They have two sets of chamfered threads: the first for cutting a rough profile and the second for finishing it. They’re only for through holes since the two different chamfers can damage the workpiece if you reverse the tap. Once done threading, release the tap from the holder and remove it from the other side of the hole. Also known as tandem taps.

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

						Drill Bit
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size, mm	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				M18 × 4 mm	4.33"	7 7/8"	Metric Trapezoidal	4	14	0.5512"	Square	3200N15	0000000

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, mm	Decimal Size Equiv.	Shank Type	Chamfer Type	No. of Flutes		Each
High-Speed Steel







				Black Oxide

				M18 × 1.5 mm	1 3/32"	4 1/32"	Metric	16.5	0.6496"	Square	Plug	3	2671A91	000000


				M18 × 2.5 mm	1 7/32"	4 1/32"	Metric	15.5	0.6102"	Square	Plug	3	2671A92	00000

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.

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, mm	Decimal Size Equiv.	Shank Type		Each		Each		Each	No. of Taps		Each
High-Speed Steel







				Uncoated

				M18 × 1.5 mm	1 13/16"	4 1/32"	Metric	4	16.5	0.6496"	Square	26565A221	000000	26565A421	000000	26565A621	000000	3	26565A821	0000000


				M18 × 2.5 mm	1 13/16"	4 1/32"	Metric	4	15.5	0.6102"	Square	———	0	26565A43	00000	26565A63	00000	3	26565A83	000000

Spark Plug Taps

Fix a costly mistake before it’s too late. If you’ve cross-threaded a hole in an engine, these taps repair the damage so spark plugs will still fit tightly. You can also use them to restore worn threads or create new ones.

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

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







				Uncoated

				M18 × 1.5 mm	1 13/16"	4 1/32"	Metric	4	16.5	0.6496"	Square	2477A22	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.

Metric Thread About Metric 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			Bottoming Chamfer
	Thread Size	Thread Lg.	Overall Lg.	No. of Flutes	Size, mm	Decimal Size Equiv.	Shank Type		Each
High-Speed Steel







				Uncoated

				M18 × 1.5 mm	7/8"	3 3/8"	4	16	0.6299"	Square	1017N116	0000000

Left-Hand Thread Tap Sets

Three chamfer types in one set create a snug fit with left-hand fasteners that secure counter-clockwise rotating parts. Left-hand threads keep components such as flywheels and propellers from loosening and spinning off. These taps have straight flutes that are good for most jobs.

High-Speed Steel—Single Thread Size Sets

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

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



		3	M18 × 1.5 mm	Metric	4	Square	26565A821	0000000


		3	M18 × 2.5 mm	Metric	4	Square	26565A83	000000

Helical Threaded Inserts For Spark Plug Repair


For Gasket Seats	For Gasket and Taper Seats

Replace stripped spark plugs in engines. These kits include helical inserts that fit common hole sizes, plus a tap and an installation tool. Also known as Heli-Coil inserts.

Inserts For Gasket Seats—Use these helical inserts in spark plug ports with a gasket. They cannot be used with taper seat ports.

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

	Includes		Each
Inserts For Gasket Seats







	18-8 Stainless Steel

	M18 x 1.5 mm	Fine	24	Installation Tool M18×1.5 mm Thread × 1/2" Insert Reach (24 Each) Through-Hole Tap	91732A055	0000000

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.
3/4", M18, M19, M20	Steel	0.462"	3, 4	2561A538	000000	3, 4	1	2561A563	00000

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

	M18 x 2.5 mm	27	47/64"	0.734"	6	Drill Bit Installation Tool Through-Hole Tap	91732A073	0000000

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		Each		Each
High-Speed Steel







				Uncoated

				M18	2 7/32"	4 11/16"	Metric	4	47/64"	0.7344"	Square	91709A373	0000000	91709A569	0000000