Trapezoidal, ACME & Buttress
Stub ACME Thread
Shallower ACME form for applications where a full-depth thread won't fit, such as thin-walled parts.
- Standard
- ASME B1.8
- Flank angle
- 29°
- Sizes listed
- 23
- Range
- 1/4" - 16 STUB ACME – 5" - 2 STUB ACME
| Nominal Diameter | Diameter Inch | Diameter mm | Tapping Drill Size mm | TPI | Pitch mm |
|---|---|---|---|---|---|
| 1/4" - 16 STUB ACME | 0.250 | 6.350 | 5.398 | 16 | 1.588 |
| 5/16" - 14 STUB ACME | 0.312 | 7.938 | 6.123 | 14 | 1.814 |
| 3/8" - 12 STUB ACME | 0.375 | 9.525 | 8.255 | 12 | 2.117 |
| 7/16" - 12 STUB ACME | 0.437 | 11.112 | 9.843 | 12 | 2.117 |
| 1/2" - 10 STUB ACME | 0.500 | 12.700 | 11.176 | 10 | 2.540 |
| 5/8" - 8 STUB ACME | 0.625 | 15.875 | 13.970 | 8 | 3.175 |
| 3/4" - 6 STUB ACME | 0.750 | 19.050 | 16.510 | 12 | 2.117 |
| 7/8" - 6 STUB ACME | 0.875 | 22.225 | 19.685 | 6 | 4.233 |
| 1" - 5 STUB ACME | 1.000 | 25.400 | 22.352 | 5 | 5.080 |
| 1 1/8" - 5 STUB ACME | 1.125 | 28.575 | 25.527 | 5 | 5.080 |
| 1 1/4" - 5 STUB ACME | 1.250 | 31.750 | 28.702 | 5 | 5.080 |
| 1 3/8" - 4 STUB ACME | 1.375 | 34.925 | 31.115 | 4 | 6.350 |
| 1 1/2" - 4 STUB ACME | 1.500 | 38.100 | 34.290 | 4 | 6.350 |
| 1 3/4" - 4 STUB ACME | 1.750 | 44.450 | 40.640 | 4 | 6.350 |
| 2" - 4 STUB ACME | 2.000 | 50.800 | 46.990 | 4 | 6.350 |
| 2 1/4" - 3 STUB ACME | 2.250 | 57.150 | 52.070 | 3 | 8.467 |
| 2 1/2" - 3 STUB ACME | 2.500 | 63.500 | 58.420 | 3 | 8.467 |
| 2 3/4" - 3 STUB ACME | 2.750 | 69.850 | 64.770 | 3 | 8.467 |
| 3" - 2 STUB ACME | 3.000 | 76.200 | 68.580 | 2 | 12.700 |
| 3 1/2" - 2 STUB ACME | 3.500 | 88.900 | 81.280 | 2 | 12.700 |
| 4" - 2 STUB ACME | 4.000 | 101.600 | 93.980 | 2 | 12.700 |
| 4 1/2" - 2 STUB ACME | 4.500 | 114.300 | 106.680 | 2 | 12.700 |
| 5" - 2 STUB ACME | 5.000 | 127.000 | 119.380 | 2 | 12.700 |
Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.