Bewise Inc. www.tool-tool.com Reference source from the internet.
表1. 公制螺紋(M) 表2. 美制螺紋(U)
| 規 格 | 牙距 | 螺 絲 攻 精 度 | | 規 格 | 牙數 | 螺 絲 攻 精 度 | ||||||
| 1級母螺紋 | 2級母螺紋 | | 1級母螺紋 | 2級母螺紋 | ||||||||
| M3 M4 M4.5 M5 M5.5 | 0.5 | GH3 | GH4 | GH5 | GH6 | | No.5 | 44 | GH3 | GH4 | GH5 | GH6 |
| M3 M3.5 | 0.35 | GH3 | GH4 | GH5 | GH6 | | No.5 No.6 | 40 | GH3 | GH4 | GH5 | GH6 |
| M3.5 | 0.6 | GH3 | GH4 | GH5 | GH6 | | No.8 | 36 | GH4 | | GH5 | GH6 |
| M4 | 0.7 | GH4 | GH5 | GH6 | GH7 | | No.6 No.8 No.10 | 32 | GH4 | | GH5 | GH6 |
| M5 | 0.8 | GH4 | GH5 | GH6 | GH7 | | No.10 No.12 | 24 | GH4 | | GH5 | GH6 |
| M6 | 1 | GH4 | GH5 | GH6 | GH7 | | No.12 | 28 | GH4 | | GH5 | GH6 |
| M4 M4.5 M6 | 0.75 | GH4 | GH5 | GH6 | GH7 | | U 1/4 | 20 | GH4 | GH5 | GH6 | GH7 |
| M7 M8 M9 | 1 | GH4 | GH5 | GH6 | GH7 | | | 28 | GH4 | | GH5 | GH6 |
| M10 M11 | 0.75 | GH4 | GH5 | GH6 | GH7 | | U 5/16 | 18 |
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