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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.
For technical drawings and 3-D models, click on a part number.
Folded | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Use With | For Thread Type | For Thread Location | For Threads per Inch | No. of Identifiers | Lg. | Wd. | Manufacturer | Manufacturer Model No. | Each | |
Inch | ||||||||||
Steel | ||||||||||
| Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 4, 4 1/2, 5, 5 1/2, 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42 | 30 | 2 5/8" | 5/8" | Starrett | 6 | 00000000 | 000000 |