螺紋 / 套筒
量測螺紋外徑和牙距；依頭部對邊尺寸選擇套筒。
公制
| 尺寸 | 套筒 · 尺寸 |
|---|---|
| 01 | 4 mm |
| 02 | 4.5 mm |
| 03 | 5 mm |
| 04 | 5.5 mm |
| 05 | 6 mm |
| 06 | 7 mm |
| 07 | 8 mm |
| 08 | 9 mm |
| 09 | 10 mm |
| 10 | 11 mm |
| 11 | 12 mm |
| 12 | 13 mm |
| 13 | 14 mm |
| 14 | 15 mm |
| 15 | 16 mm |
| 16 | 17 mm |
| 17 | 18 mm |
| 18 | 19 mm |
| 19 | 20 mm |
| 20 | 21 mm |
| 21 | 22 mm |
| 22 | 23 mm |
| 23 | 24 mm |
| 24 | 25 mm |
| 25 | 26 mm |
| 26 | 27 mm |
| 27 | 28 mm |
| 28 | 29 mm |
| 29 | 30 mm |
| 30 | 31 mm |
| 31 | 32 mm |
SAE
| 尺寸 | 套筒 · 尺寸 |
|---|---|
| 01 | 5/32 in. |
| 02 | 3/16 in. |
| 03 | 7/32 in. |
| 04 | 1/4 in. |
| 05 | 9/32 in. |
| 06 | 5/16 in. |
| 07 | 11/32 in. |
| 08 | 3/8 in. |
| 09 | 7/16 in. |
| 10 | 1/2 in. |
| 11 | 9/16 in. |
| 12 | 5/8 in. |
| 13 | 11/16 in. |
| 14 | 3/4 in. |
| 15 | 13/16 in. |
| 16 | 7/8 in. |
| 17 | 15/16 in. |
| 18 | 1 in. |
| 19 | 1-1/16 in. |
| 20 | 1-1/8 in. |
| 21 | 1-3/16 in. |
| 22 | 1-1/4 in. |
| 23 | 1-5/16 in. |
| 24 | 1-3/8 in. |
| 25 | 1-7/16 in. |
| 26 | 1-1/2 in. |
螺紋 / 套筒
六角套筒通常較貼合六角頭；十二角套筒較容易定位。避免使用過鬆的工具。
資料僅供工坊參考。標準、公差、材質和工具可能不同，請依製造商規範。