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Small screws have different thread pitches due to different thread diameter sizes. Shenzhen Shi Shi Tong talks about the small screw dimensions below the M3 specification – the pitch and the thread diameter.
M/M Coarse Machine Thread Screw 6G
| Size | Pitch | Thread Diameter Tolerance | |
| Max | Min | ||
| M1.2 | 0.25 | 1.18 | 1.14 |
| M1.4 | 0.3 | 1.38 | 1.34 |
| M1.6 | 0.35 | 1.581 | 1.496 |
| M1.7 | 0.35 | 1.68 | 1.61 |
| M1.8 | 0.35 | 1.781 | 1.696 |
| M2 | 0.4 | 1.981 | 1.886 |
| M2.3 | 0.4 | 2.281 | 2.186 |
| M2.6 | 0.45 | 2.58 | 2.48 |
| M3 | 0.5 | 2.98 | 2.874 |
M/M Fine Machine Thread Screw 6G
| Size | Pitch | Thread Diameter Tolerance | |
| Max | Min | ||
| M2.5 | 0.35 | 2.481 | 2.396 |
| M3 | 0.35 | 2.981 | 2.896 |
UNC Machine Small Screw Dimensions
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| #1 | 64 | 1.838 | 1.743 |
| #2 | 56 | 2.169 | 2.066 |
| #3 | 48 | 2.496 | 2.383 |
| #4 | 40 | 2.824 | 2.695 |
| #5 | 40 | 3.154 | 3.026 |
| #6 | 32 | 3.484 | 3.333 |
UNF Machine Small Screw Dimensions
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| #2 | 64 | 2.169 | 2.073 |
| #3 | 56 | 2.496 | 2.393 |
| #4 | 48 | 2.827 | 2.713 |
| #5 | 44 | 3.157 | 3.036 |
| #6 | 40 | 3.484 | 3.356 |
BSW Machine Small Screw Dimensions
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| 1/16 | 60 | 1.56 | 1.47 |
| 3/32 | 48 | 2.361 | 2.155 |
| 1/8 | 40 | 3.155 | 3.045 |
| 5/32 | 32 | 3.945 | 3.795 |
Tapping Screw ASA Type A
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| #0 | 40 | 1.52 | 1.44 |
| #1 | 32 | 1.9 | 1.82 |
| #2 | 32 | 2.23 | 2.13 |
| #3 | 28 | 2.56 | 2.46 |
| #4 | 24 | 2.89 | 2.79 |
| #5 | 20 | 3.3 | 3.2 |
| #6 | 18 | 3.58 | 3.45 |
Tapping Screw ASA Type AB. (B)
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| #0 | 48 | 1.52 | 1.37 |
| #1 | 42 | 1.9 | 1.75 |
| #2 | 32 | 2.23 | 2.08 |
| #3 | 28 | 2.56 | 2.41 |
| #4 | 24 | 2.89 | 2.74 |
| #5 | 20 | 3.3 | 3.12 |
| #6 | 20 | 3.5 | 3.35 |
M/M Tapping Screw Type A
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| ST1 | 60 | 1.05 | 1 |
| ST1.2 | 56 | 1.25 | 1.2 |
| ST1.4 | 48 | 1.5 | 1.4 |
| ST1.7 | 40 | 1.8 | 1.7 |
| ST2 | 32 | 2.1 | 2 |
| ST2.3 | 32 | 2.4 | 2.3 |
| ST2.6 | 28 | 2.7 | 2.6 |
| ST3 | 24 | 3.1 | 3 |
M/M Tapping Screw Type AB. (B)
| Size | T | Thread Diameter Tolerance | |
| Max | Min | ||
| ST1 | 64 | 1 | 0.95 |
| ST1.2 | 64 | 1.2 | 1.15 |
| ST1.4 | 56 | 1.4 | 1.35 |
| ST1.7 | 48 | 1.7 | 1.62 |
| ST2 | 40 | 2 | 1.9 |
| ST2.3 | 32 | 2.3 | 2.2 |
| ST2.6 | 28 | 2.6 | 2.5 |
| ST3 | 24 | 3 | 2.9 |
If you want to know more about the small screw dimensions, please feel free to contact us at: annie.li@szsst88.com
10 月-11-2018
kalyn
+86 13143444311
sst@szsst88.com
