| TAPPING SCREW ASA TYPE A | |||||
| 美國規格鐵板螺絲A型 | |||||
| 規格 | 牙數 | 外徑（D） | 輾造徑（d） | ||
| MAX | MIN | MAX | MIN | ||
| NO.0 | 40 | 1.52 | 1.44 | 1.20 | 1.15 |
| NO.1 | 32 | 1.90 | 1.82 | 1.50 | 1.45 |
| NO.2 | 32 | 2.23 | 2.13 | 1.80 | 1.75 |
| NO.3 | 28 | 2.56 | 2.46 | 2.10 | 2.05 |
| NO.4 | 24 | 2.89 | 2.79 | 2.30 | 2.25 |
| NO.5 | 20 | 3.30 | 3.20 | 2.65 | 2.60 |
| NO.6 | 18 | 3.58 | 3.45 | 2.80 | 2.75 |
| NO.7 | 16 | 4.01 | 3.86 | 3.15 | 3.10 |
| NO.8 | 15 | 4.26 | 4.11 | 3.35 | 3.30 |
| NO.9 | 14 | 4.55 | 4.40 | 3.50 | 3.45 |
| NO.10 | 12 | 4.92 | 4.77 | 3.75 | 3.70 |
| NO.12 | 11 | 5.60 | 5.46 | 4.40 | 4.35 |
| NO.14 | 10 | 6.45 | 6.29 | 5.10 | 5.05 |
| NO.16 | 10 | 7.11 | 6.96 | 5.70 | 5.65 |
| NO.18 | 9 | 7.77 | 7.62 | 6.10 | 6.05 |
