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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 | For Thread Pitch  | No. of Identifiers | Lg. | Wd. | Manufacturer | Manufacturer Model No. | Each | |
Inch | |||||||||||
Steel | |||||||||||
| Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 2 1/4, 2 3/8, 2 1/2, 2 5/8, 2 3/4, 2 7/8, 3, 3 1/4, 3 1/2, 4, 4 1/2, 5, 5 1/2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28 | __ | 27 | 3 1/2" | 7/8" | Starrett | 155 | 00000000 | 000000 |
| Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 3 1/2, 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 | __ | 28 | 2 1/2" | 5/8" | Starrett | 484 | 00000000 | 00000 |
| 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 | 00000 |
| 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, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84 | __ | 51 | 3 3/8" | 3/4" | Starrett | 472 | 00000000 | 000000 |
| Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 4, 4 1/2, 5, 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 48, 56, 64, 72, 80 | __ | 28 | 2 1/2" | 5/8" | Starrett | 474 | 00000000 | 00000 |
| Screws, Bolts, Threaded Rods, Nuts | BSW | External/Internal | 3 1/2, 4, 4 1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32, 36, 40, 44, 48, 50, 60 | __ | 30 | 2" | 1/2" | Starrett | 476 | 00000000 | 00000 |
Metric | |||||||||||
Steel | |||||||||||
| Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | __ | 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.9 mm, 2 mm, 2.5 mm | 28 | 2 1/2" | 1/2" | Starrett | 156M | 0000000 | 00000 |
| Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | __ | 0.5 mm, 0.75 mm, 1 mm, 1.1 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, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm | 27 | 3 1/2" | 5/8" | Starrett | 159M | 00000000 | 00000 |
Threads per Inch and Center Identifiers
Identify threads per inch on external threads and find the center of your workpiece to line up thread-cutting tools. This identifier has a corrosion-resistant satin-chrome finish that reduces glare.
| For Use With | For Thread Type | For Thread Location | For Threads per Inch | Lg. | Wd. | Thick. | Appearance | Each | |
Inch | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Chrome Plated Steel | |||||||||
| Screws, Bolts, Threaded Rods | UNC/UNF | External | 14, 20, 24, 32 | 2 1/4" | 3/4" | 3/64" | Satin | 0000000 | 000000 |