Acme Thread Gauges | McMaster-Carr

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Thread Type

Threads per Inch

For Use With

Material

System of Measurement

Thread Pitch

For Acme Threads per Inch

Thread Location

Container Type

Gender

Export Control Classification Number (ECCN)

EAR99

Number of Wires

Thread Size

Outlet Gender

DFARS Specialty Metals

Exempt

Inlet Thread Type

Acme

Number of Identifiers

RoHS

Compliant

Compliant with Exemptions

Folded Length

REACH

Height

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Container Material

Vinyl Plastic

Display Type

Analog

Gauge Measurement Type

No-Go

Size-Checking Gauge Class

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29 Products

Threads per Inch and Thread Pitch Size Checkers

Inspect fasteners and verify threads with this checker. It includes three wires for each of the pitch diameters. Select the wire that best fits the threads; then calculate the pitch diameter with the equations provided.

								Wire		Container
	For Use With	For Thread Type	For Thread Location	For Threads per In.	For Thread Pitch, mm	For Acme Threads per In.	No. of Wires	Lg.	Material	Type	Material		Each
Inch/Metric



		Screws, Bolts, Threaded Rods, Pipe	NPT, UNC, UNF, Metric, Acme	External	3, 3 1/2, 4, 4 1/2, 5, 5 1/2, 6, 7, 7 1/2, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 48	0.5, 0.6, 0.7, 0.75, 0.8, 1, 1.25, 1.5, 1.75, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6	3, 4, 5, 6, 8, 10, 12, 14, 16	48	2 3/4"	Stainless Steel	Pouch	Vinyl Plastic	2082A1	000000

Threads per Inch and Thread Pitch Identifiers

Determine threads per inch and thread pitch on nuts, bolts, and other fasteners. Identifiers in a variety of sizes are riveted together in a fan design—pull one out and hold it against your threads to see if it fits. Once you’ve found a match, fold identifiers in to store them in your pocket or tool bag.

							Folded
	For Use With	For Thread Type	For Thread Location	For Threads per Inch	For Thread Pitch, mm	No. of Identifiers	Lg.	Wd.		Each
Inch







				Stainless Steel

				Screws, Bolts, Threaded Rods, Nuts	Acme	External/Internal	1, 1 1/3, 1 1/2, 1 3/4, 2, 2 1/2, 3, 3 1/2, 4, 5, 6, 7, 8, 9, 10, 12	—	16	4 3/4"	1"	2071A69	0000000


				Metric







								Stainless Steel

								Screws, Bolts, Threaded Rods, Nuts	Metric Trapezoidal	External/Internal	—	2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 16, 20	12	4 3/4"	3/4"	2071A113	00000

Acme Threaded Plug Gauges with Handle

Determine if lead nuts, screw collars, and other parts with internal Acme threads are within tolerance. These gauges are attached to a handle to help you quickly thread or unthread them. All are precisely manufactured to tight tolerances. Instead of replacing the whole tool when a gauge wears down, you can insert a new gauge (not included) into the handle.

A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads. Acme Class 2G is standard for Acme threads.

						Go Gauges			No-Go Gauges
	Thread Size	Hardness	Material	Features	For Thread Fit	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
Class X Gauge



		1/4"-16	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0003"	23565A341	0000000	-0.0003" to 0"	23565A352	0000000


		3/8"-12	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0003"	23565A342	000000	-0.0003" to 0"	23565A353	000000
		1/2"-10	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A343	000000	-0.0004" to 0"	23565A354	000000
		5/8"-8	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A344	000000	-0.0004" to 0"	23565A355	000000
		3/4"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A345	000000	-0.0004" to 0"	23565A356	000000
		3/4"-6	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A346	000000	-0.0004" to 0"	23565A357	000000
		1"-4	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A347	000000	-0.0004" to 0"	23565A358	000000
		1"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A348	000000	-0.0004" to 0"	23565A359	000000
		1"-10	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A349	000000	-0.0004" to 0"	23565A361	000000
		1 1/4"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A351	000000	-0.0004" to 0"	23565A362	000000

Acme Thread Identifiers

Identify Acme threads and use as a guide while grinding and cutting Acme threads to a 29° included angle.

	For Acme Threads per In.	Wd.	Ht.	Thk.		Each
Inch







	Steel

	Screws, Bolts, Threaded Rods	Acme	External	1, 1 1/3, 1 1/2, 1 3/4, 2, 2 1/2, 3, 4, 5, 6, 7, 8, 9, 10	3 3/8"	1 5/8"	7/64"	8615A69	000000

Propane Tank Refill Indicator Gauges

Know at a glance if your propane gas supply is running low. These gauges work with tanks manufactured after 1995.

	Inlet				Internal Outlet Connection		External Outlet Connection
For Use With	Thread Size	Thread Type	Gender	For Valve Type	CGA Number	Gender	Thread Size	Thread Type	Gender	Cable Lg.		Each



	Propane	1 5/16"-5	Acme	Female	POL/Acme (Type 1)	510	Female	1 5/16"-5	Acme	Male	30"	76775A3	000000

Refrigerant Pressure Testing and Charging Manifolds

Two Valve

Monitor refrigerant pressure with analog gauges when servicing air conditioning systems. All manifolds have double O-ring piston valves.

			Hose
	For Refrigerant No.	Valve Material	Connection	Lg., ft.	Dia.	Gauge Color		Each
Two-Valve Manifold



		R-134A	Brass	1/2"-16 × Acme 7/16"-20 UNF 7/16"-20 UNF	6	2 1/2"	Blue, Red	1873K24	0000000

Replacement Pressure Gauges