| 螺絲頭徑 | |
| 英制IFI | 公制DIN |
| #2 | M2.5 |
| #3 | M2.8 |
| #4 | M2.9 |
| #5 | M3.2 |
| #6 | M3.5 |
| #7 | M3.9 |
| #8 | M4.2 |
| #9 | M4.5 |
| #10 | M4.8 |
| #12 | M5.5 |
| #14 | M6.3 |
| 螺絲長度 | ||
| 英制IFI | 公制DIN | 稱呼 |
| 1/8" | 3mm | 1分 |
| 5/16" | 8mm | 2分5厘 |
| 3/8" | 10mm | 3分 |
| 1/2" | 13mm | 4分 |
| 5/8" | 16mm | 5分 |
| 3/4" | 19mm | 6分 |
| 7/8" | 22mm | 7分 |
| 1" | 25mm | 8分=1吋 |
| 1-1/16" | 30mm | 1吋5厘 |
| 1-1/4" | 32mm | 10分=1吋2分 |
| 1-3/8" | 35mm | 1吋3分 |
| 1-1/2" | 38mm | 12分=1吋4分 |
| 1-3/4" | 45mm | 1吋6分 |
| 1-7/8" | 47mm | 1吋7分 |
| 2" | 50mm | 16分=2吋 |
| 2-3/8" | 60mm | 2吋3分 |
| 2-1/2" | 63mm | 20分=2吋4分 |
| 2-5/8" | 66mm | 2吋5分 |
| 3" | 75mm | 24分=3吋 |
| 3-1/8" | 80mm | 25分=3吋1分 |
| 3-1/2" | 90mm | 28分=3吋4分 |
| 4" | 100mm | 32分=4吋 |
| 5" | 125mm | 40分=5吋 |