Acme Cutting Tools | McMaster-Carr

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Acme and Metric Trapezoidal Thread Taps

Form general purpose Acme threads. These high-speed steel taps are for use on most metal and plastic. With a square shank, they're compatible with tap holders for drill presses and milling machines. Also known as tandem taps, these have an extended chamfer with two sets of chamfered cutting threads. Because these sets of threads have different shapes, reversing the tap for removal may cause damage to the workpiece and is not recommended. Use these taps with a rigid setup to tap through holes only.

Metric trapezoidal threads are similar to Acme threads.

For technical drawings and 3-D models, click on a part number.

Acme

Thread			Drill Bit				Right Hand		Left Hand
Size	Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes	Pitch Dia. Limit		Each		Each
Uncoated High-Speed Steel
1/4"-16	1 3/4"	3"	10 ga.	0.1935"	4	2G	00000000	0000000	00000000	0000000
3/8"-12	2 1/8"	4 1/16"	7.6 mm	0.2992"	4	2G	00000000	000000	00000000	000000
7/16"-12	2 9/16"	5"	23/64"	0.3594"	4	2G	00000000	000000	00000000	000000
1/2"-10	2 9/16"	5"	13/32"	0.4063"	4	2G	00000000	000000	00000000	000000
5/8"-8	3 3/16"	6 1/4"	13 mm	0.5118"	4	2G	00000000	000000	00000000	000000
5/8"-10	3 3/16"	6 1/4"	17/32"	0.5313"	4	2G	00000000	000000	00000000	000000
3/4"-5	4 5/16"	7 15/16"	14.5 mm	0.5709"	4	2G	00000000	000000	00000000	000000
3/4"-6	4 5/16"	7 15/16"	39/64"	0.6094"	4	2G	00000000	000000	00000000	000000
3/4"-8	4 5/16"	7 15/16"	41/64"	0.6406"	4	2G	00000000	000000	00000000	000000
3/4"-10	4 5/16"	7 15/16"	21/32"	0.6563"	4	2G	00000000	000000	00000000	000000
3/4"-16	4 5/16"	7 15/16"	11/16"	0.6875"	4	2G	00000000	000000	00000000	000000
7/8"-6	4 3/8"	8 5/8"	47/64"	0.7344"	4	2G	00000000	000000	00000000	000000
1"-4	5 1/4"	10 1/8"	49/64"	0.7656"	4	2G	00000000	000000	00000000	000000
1"-5	5 1/4"	10 1/8"	21 mm	0.8268"	4	2G	00000000	000000	00000000	000000
1"-6	5 1/4"	10 1/8"	53/64"	0.833"	4	2G	00000000	000000	00000000	000000
1"-8	5 1/4"	10 1/8"	7/8"	0.875"	4	2G	00000000	000000	00000000	000000
1"-10	5 1/4"	10 1/8"	29/32"	0.9063"	4	2G	00000000	000000	00000000	000000
1 1/8"-5	5 1/4"	10 3/4"	24 mm	0.9449"	4	2G	00000000	000000	00000000	000000
1 1/4"-4	5 1/4"	11 1/8"	1 1/64"	1.0156"	4	2G	00000000	000000	00000000	000000
1 1/4"-5	5 1/4"	11 1/8"	1 5/64"	1.0781"	4	2G	00000000	000000	00000000	000000
1 3/8"-4	5 7/8"	12 1/4"	1 9/64"	1.1406"	4	2G	00000000	000000	00000000	000000
1 1/2"-4	5 7/8"	12 5/8"	32 mm	1.2598"	4	2G	00000000	000000	00000000	000000
1 1/2"-5	5 7/8"	12 5/8"	1 19/64"	1.3"	4	2G	00000000	000000	00000000	000000

Metric Trapezoidal

Thread				Drill Bit				Right Hand
Size	Pitch, mm	Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes	Pitch Dia. Limit		Each
Uncoated High-Speed Steel
M10	2	2.56"	5 1/8"	8 mm	0.315"	3	H7	0000000	0000000
M12	3	2.56"	5 1/8"	9 mm	0.3543"	3	H7	0000000	000000
M14	3	3.15"	6 5/16"	11 mm	0.4331"	4	H7	0000000	000000
M16	4	3.15"	6 5/16"	12 mm	0.4724"	4	H7	0000000	000000
M18	4	4.33"	7 7/8"	14 mm	0.5512"	4	H7	0000000	000000
M20	4	4.33"	8 3/4"	16 mm	0.6299"	4	H7	0000000	000000
M22	5	4.33"	8 3/4"	17 mm	0.6693"	4	H7	0000000	000000
M24	5	5.31"	10 1/4"	19 mm	0.748"	4	H7	0000000	000000
M26	5	5.31"	10 1/4"	21 mm	0.8268"	4	H7	0000000	000000

Acme Thread Repairing Dies

Repair the broad, square threads on Acme threaded rods and studs. These dies are for use on general purpose Acme threads with a Class 2G thread fit. They're hex shaped for use with conventional wrenches.

For technical drawings and 3-D models, click on a part number.

Acme Right-Hand Thread
Thread Size	Thread Fit	Wd.	Material		Each
3/8"-10	Class 2G	1 1/16"	High-Speed Steel	0000000	000000
1/2"-8	Class 2G	1 1/16"	High-Speed Steel	0000000	000000
1/2"-10	Class 2G	1 1/16"	High-Speed Steel	0000000	000000
5/8"-6	Class 2G	1 1/4"	High-Speed Steel	0000000	000000
5/8"-8	Class 2G	1 1/4"	High-Speed Steel	0000000	000000
5/8"-10	Class 2G	1 1/4"	High-Speed Steel	0000000	000000
3/4"-5	Class 2G	1 7/16"	High-Speed Steel	0000000	000000
3/4"-6	Class 2G	1 7/16"	High-Speed Steel	0000000	000000
3/4"-8	Class 2G	1 7/16"	High-Speed Steel	0000000	000000
3/4"-10	Class 2G	1 7/16"	High-Speed Steel	0000000	000000
7/8"-5	Class 2G	1 5/8"	High-Speed Steel	0000000	000000
7/8"-6	Class 2G	1 5/8"	High-Speed Steel	0000000	000000
1"-4	Class 2G	1 13/16"	High-Speed Steel	0000000	000000
1"-5	Class 2G	1 13/16"	High-Speed Steel	0000000	000000
1"-10	Class 2G	1 13/16"	High-Speed Steel	0000000	000000
1 1/8"-5	Class 2G	2"	High-Speed Steel	0000000	000000
1 1/4"-4	Class 2G	2 3/16"	High-Speed Steel	0000000	000000
1 1/4"-5	Class 2G	2 3/16"	High-Speed Steel	0000000	000000
1 1/2"-4	Class 2G	2 5/8"	High-Speed Steel	0000000	000000

Solid Carbide Internal Threading Lathe Tools

Made of solid carbide, these tools provide more rigidity than carbide-tipped tools. Use them to create internal Acme threads or V-shaped UNC, UNS, and UNF threads. All have flats on the shank for quick alignment.

For technical drawings and 3-D models, click on a part number.

Acme Threads

Right Hand
Threads Per Inch	Min. Hole Dia.	Max. Hole Dp.	Offset	Shank Dia.	Overall Lg.	Material	Nose Angle	For Use On		Each
6	0.49"	2"	0.12"	1/2"	3"	Micrograin Carbide	29°	Aluminum, Brass, Bronze, Cast Iron, Nickel, Stainless Steel, Steel	0000000	000000
5	0.49"	2"	0.12"	1/2"	3"	Micrograin Carbide	29°	Aluminum, Brass, Bronze, Cast Iron, Nickel, Stainless Steel, Steel	0000000	00000
4	0.49"	2"	0.15"	1/2"	3"	Micrograin Carbide	29°	Aluminum, Brass, Bronze, Cast Iron, Nickel, Stainless Steel, Steel	0000000	00000