M2.5 Taps | McMaster-Carr

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







				Uncoated

				M2.5 × 0.45 mm	1/2"	1 13/16"	Metric	3	2.05	0.0807"	Square	Greenfield Industries	8305A11	000000	8305A31	000000	8305A51	000000	3	8305A513	000000




						Titanium Nitride (TiN) Coated

						M2.5 × 0.45 mm	1/2"	1 13/16"	Metric	2	2.05	0.0807"	Square	Viking Norseman Drill	26475A33	00000	26475A69	00000	26475A64	00000	3	26475A12	00000


						Cobalt Steel







										Uncoated

										M2.5 × 0.45 mm	7/16"	1 7/8"	Metric	3	2.05	0.0807"	Square	Viking Norseman Drill	———	0	2662A55	00000	———	0	—	———	0

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	Mfr.		Each
Gold-Oxide High-Speed Steel Tap



	18	Plug	M2.5 × 0.45 mm M3 × 0.5 mm M3.5 × 0.6 mm M4 × 0.7 mm M5 × 0.8 mm M6 × 1.00 mm M8 × 1.25 mm M10 × 1.5 mm M12 × 1.75 mm	1 13/16" 1 15/16" 2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 3/8"	Metric	2, 3	D3, D4, D5, D6	2.05 mm 2.5 mm 2.9 mm 3.3 mm 4.2 mm 5 mm 6.7 mm 8.5 mm 10.2 mm	Black/Gold Oxide High-Speed Steel	Metal Case	Viking Norseman Drill	27275A11	0000000

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	M2.5 × 0.45 mm	Metric	Plastic Case	3	Square	Greenfield Industries	8305A513	000000


		Titanium Nitride (TiN) Coated



				3	M2.5 × 0.45 mm	Metric	Plastic Case	2	Square	Viking Norseman Drill	26475A12	00000

Tap and Drill Bit Sets

Metal Case

Drill and tap a variety of hole sizes. These taps and drill bits are for use on metal and plastic.

Uncoated High-Speed Steel Tap—Uncoated high-speed steel taps have a longer tool life than carbon steel. They are strong enough for most jobs but don’t last as long as other high-speed steel taps. Use them for small-scale jobs.

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.

Uncoated High-Speed Steel Drill Bit—Uncoated high-speed steel drill bits have a longer tool life than carbon steel. They are strong enough for most jobs but don’t last as long as other high-speed steel drill bits. Use them for small-scale jobs.

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



	18	Plug	1 each of sizes: M2.5 × 0.45 mm M3 × 0.50 mm M3.5 × 0.60 mm M4 × 0.70 mm M5 × 0.80 mm M6 × 1.00 mm M8 × 1.25 mm M10 × 1.50 mm M12 × 1.75 mm	1 3/4" 1 15/16" 2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 3/8"	Metric	3, 4	D3, D4, D5, D6	2.05 mm 2.5 mm 2.9 mm 3.3 mm 4.2 mm 5.0 mm 6.7 mm 8.5 mm 10.2 mm	Uncoated High-Speed Steel	Metal Case	Chicago-Latrobe	26175A12	0000000

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	Mfr.	Chamfer Type	No. of Flutes		Each
High-Speed Steel







				Uncoated

				M2.5 × 0.45 mm	1/2"	1 13/16"	Metric	2.05	0.0807"	Square	Widia	Plug	2	8302A11	000000




						Titanium Nitride (TiN) Coated

						M2.5 × 0.45 mm	1/2"	1 13/16"	Metric	2.05	0.0807"	Square	Cleveland	Plug	2	2703A63	00000




								Titanium Carbon Nitride (TiCN) Coated

								M2.5 × 0.45 mm	1/2"	1 13/16"	Metric	2.05	0.0807"	Square	Widia	Plug	2	2605A13	00000

Chip-Clearing Taps for Nickel

Spiral Flute for Through Holes

Spiral Flute for Blind 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.

Spiral Flute for Blind Holes—Pull chips back toward the tap so they won't build up in blind 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			Spiral Flute for Blind Holes
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	Chamfer Type	Size	Decimal Size Equiv.	Shank Type	Mfr.	No. of Flutes		Each	No. of Flutes		Each
Cobalt Steel







				Black Oxide

				M2.5 × 0.45 mm	1/2"	1.81"	Metric	Plug	5/64"	0.0781"	Square	Widia	2	25595A11	000000	3	25595A15	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

				M2.5	5/8"	1 15/16"	Metric	3	37 Ga.	0.104"	Square	Heli-Coil	91709A678	000000	91709A578	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

	M2.5 x 0.45 mm	3.8	2.55	0.102"	10	Drill Bit Installation Tool Through-Hole Tap	91732A873	0000000