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  | 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" | 0000000 | 0000000 |
Metric | |||||||||
Stainless Steel | |||||||||
| Screws, Bolts, Threaded Rods, Nuts | Metric Trapezoidal | External/Internal | __ | 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, 16 mm, 20 mm | 12 | 4 3/4" | 3/4" | 00000000 | 00000 |
Acme Thread Identifiers
Identify Acme threads and use as a guide while grinding and cutting Acme threads to a 29° included angle.
| For Use With | For Thread Location | For Threads per Inch | Wd. | Ht. | Thick. | Each | |
Steel | |||||||
|---|---|---|---|---|---|---|---|
| Screws, Bolts, Threaded Rods | 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" | 0000000 | 000000 |
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 check the minimum internal thread size. No-go gauges check the maximum internal thread size.
Thread fit designates the tightness or looseness of mating threads. 2G is standard for Acme threads.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Hardness | Material | Features | For Thread Fit | Pitch Dia. Tolerance | Each | |
Go Gauges | |||||||
|---|---|---|---|---|---|---|---|
Class X | |||||||
| 1/4"-16 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0003" | 000000000 | 0000000 |
| 3/8"-12 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0003" | 000000000 | 000000 |
| 1/2"-10 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 5/8"-8 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 3/4"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 3/4"-6 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 1"-4 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 1"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 1"-10 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
| 1 1/4"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | 0" to 0.0004" | 000000000 | 000000 |
No-Go Gauges | |||||||
Class X | |||||||
| 1/4"-16 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0003" to 0" | 000000000 | 000000 |
| 3/8"-12 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0003" to 0" | 000000000 | 000000 |
| 1/2"-10 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 5/8"-8 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 3/4"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 3/4"-6 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 1"-4 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 1"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 1"-10 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
| 1 1/4"-5 | Rockwell C60 | Tool Steel | Taperlock Handle | Class 2G | -0.0004" to 0" | 000000000 | 000000 |
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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Use With | For Thread Type | For Thread Location | For Threads per Inch | For Thread Pitch | For Acme Threads per Inch | No. of Wires | Lg. | Material | Container | Container 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 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm | 3, 4, 5, 6, 8, 10, 12, 14, 16 | 48 | 2 3/4" | Stainless Steel | Pouch | Vinyl | 000000 | 000000 |