常用公制与英制螺丝规格对照表 | 含3D打印优化尺寸
支持公制螺纹(M)和英制管螺纹(G)，含3D打印优化尺寸
| 螺纹代号 | 大径 (mm) | 螺距 P (mm) | H=0.866P (mm) | 尖端裁切 h/8 (mm) | 底部嵌入 h/4 (mm) | 实际牙高 (mm) | 3D外牙大径 (mm) | 3D内牙大径 (mm) |
|---|---|---|---|---|---|---|---|---|
| M3 | 3.000 | 0.5 | 0.4330 | 0.0541 | 0.1083 | 0.2706 | 2.98 | 3.02 |
| M4 | 4.000 | 0.7 | 0.6062 | 0.0758 | 0.1516 | 0.3788 | 3.96 | 4.04 |
| M5 | 5.000 | 0.8 | 0.6928 | 0.0866 | 0.1732 | 0.4330 | 4.95 | 5.05 |
| M6 | 6.000 | 1.0 | 0.8660 | 0.1083 | 0.2165 | 0.5412 | 5.95 | 6.05 |
| M8 | 8.000 | 1.25 | 1.0825 | 0.1353 | 0.2706 | 0.6766 | 7.92 | 8.08 |
| M10 | 10.000 | 1.5 | 1.2990 | 0.1624 | 0.3248 | 0.8118 | 9.90 | 10.10 |
| M12 | 12.000 | 1.75 | 1.5155 | 0.1894 | 0.3789 | 0.9472 | 11.88 | 12.12 |
| M14 | 14.000 | 2.0 | 1.7320 | 0.2165 | 0.4330 | 1.0825 | 13.85 | 14.15 |
| M16 | 16.000 | 2.0 | 1.7320 | 0.2165 | 0.4330 | 1.0825 | 15.85 | 16.15 |
| M20 | 20.000 | 2.5 | 2.1650 | 0.2706 | 0.5413 | 1.3531 | 19.80 | 20.20 |
| M24 | 24.000 | 3.0 | 2.5980 | 0.3248 | 0.6495 | 1.6237 | 23.75 | 24.25 |
| M30 | 30.000 | 3.5 | 3.0310 | 0.3789 | 0.7578 | 1.8943 | 29.70 | 30.30 |
牙型计算说明：等边三角形高度 H = 0.866 × 螺距 P；尖端裁切 = H/8；底部嵌入 = H/4；实际牙高 = H - H/8 - H/4
| 螺纹代号 | 大径 (inch/mm) | 螺距 (TPI/mm) |
|---|---|---|
| #2-56 | 0.086" / 2.184mm | 56 TPI / 0.453mm |
| #4-40 | 0.112" / 2.845mm | 40 TPI / 0.635mm |
| #6-32 | 0.138" / 3.505mm | 32 TPI / 0.794mm |
| #8-32 | 0.164" / 4.166mm | 32 TPI / 0.794mm |
| #10-24 | 0.190" / 4.826mm | 24 TPI / 1.058mm |
| 1/4"-20 | 0.250" / 6.350mm | 20 TPI / 1.270mm |
| 5/16"-18 | 0.313" / 7.938mm | 18 TPI / 1.411mm |
| 3/8"-16 | 0.375" / 9.525mm | 16 TPI / 1.588mm |
| 7/16"-14 | 0.438" / 11.113mm | 14 TPI / 1.814mm |
| 1/2"-13 | 0.500" / 12.700mm | 13 TPI / 1.954mm |
| 螺纹代号 | 管外径 (mm) | 每英寸牙数 | 螺距 (mm) | 大径 (mm) | 中径 (mm) |
|---|---|---|---|---|---|
| G1/8 | 9.728 | 28 | 0.907 | 9.728 | 9.147 |
| G1/4 | 13.157 | 19 | 1.337 | 13.157 | 12.301 |
| G3/8 | 16.662 | 19 | 1.337 | 16.662 | 15.806 |
| G1/2 | 20.955 | 14 | 1.814 | 20.955 | 19.793 |
| G3/4 | 26.441 | 14 | 1.814 | 26.441 | 25.279 |
| G1 | 33.249 | 11 | 2.309 | 33.249 | 31.770 |
| G1¼ | 41.910 | 11 | 2.309 | 41.910 | 40.431 |
| G1½ | 47.803 | 11 | 2.309 | 47.803 | 46.324 |
| 英制规格 | 外径 (inch/mm) | 螺距 (TPI/mm) | 最接近公制 | 兼容性 |
|---|---|---|---|---|
| #10-24 | 0.190" / 4.83mm | 24 TPI / 1.06mm | M5×0.8 | 不可互换 |
| 1/4"-20 | 0.250" / 6.35mm | 20 TPI / 1.27mm | M6×1.0 | 紧急替代 |
| 5/16"-18 | 0.313" / 7.94mm | 18 TPI / 1.41mm | M8×1.25 | 不可互换 |
| 3/8"-16 | 0.375" / 9.53mm | 16 TPI / 1.59mm | M10×1.5 | 不可互换 |
| 1/2"-13 | 0.500" / 12.70mm | 13 TPI / 1.95mm | M12×1.75 | 不可互换 |
当前螺纹参数：
螺距 P = 1.5 mm
每圈高度 = 1.5 mm
计算公式：
圈数 = 高度 ÷ 螺距
总角度 = 圈数 × 360°