M27 Taps | McMaster-Carr

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		Each		Each		Each	No. of Taps		Each
High-Speed Steel







				Uncoated

				M27 × 1.5 mm	1 1/2"	4"	Metric	6	1"	1"	Square	26015A244	0000000	26015A245	0000000	26015A246	0000000	3	26015A456	0000000


				M27 × 2 mm	2 1/2"	5 1/8"	Metric	4	25 mm	0.9842"	Square	26015A361	000000	26015A362	000000	26015A363	000000	3	26015A457	000000
				M27 × 3 mm	2 1/2"	5 1/8"	Metric	4	24 mm	0.9449"	Square	26015A371	000000	26015A372	000000	26015A373	000000	3	26015A458	000000

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.

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



		3	M27 × 1.5 mm	Metric	Plastic Case	6	Square	26015A456	0000000


		3	M27 × 2 mm	Metric	Plastic Case	4	Square	26015A457	000000
		3	M27 × 3 mm	Metric	Plastic Case	4	Square	26015A458	000000