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耐高温、磨损、腐蚀四氟 聚四氟乙烯俗称"塑料王"。中文商品名“铁氟龙”、“特氟龙”、等。PTFE四氟螺丝它具有优良的化学稳定性、耐腐蚀性、密封性、高润滑不粘性、电绝缘性和良好的抗老化耐力。能在+250℃至-180℃的温度下长期工作，
| M/M 机械螺丝 2A (60º) |
| 规格 | 牙距 | 外径（D） | 辗造径 |
| P | MAX | MIN | MAX | MIN |
| M2 | 0.4 | 1.98 | 1.89 | 1.72 | 1.69 |
| M2.3 | 0.4 | 2.28 | 2.19 | 2.02 | 1.99 |
| M2.5 | 0.45 | 2.48 | 2.38 | 2.18 | 2.15 |
| M2.6 | 0.45 | 2.58 | 2.48 | 2.28 | 2.25 |
| M3 | 0.5 | 2.98 | 2.88 | 2.64 | 2.61 |
| M3.5 | 0.6 | 3.47 | 3.36 | 3.06 | 3.03 |
| M4 | 0.7 | 3.98 | 3.84 | 3.49 | 3.15 |
| M4.5 | 0.75 | 4.47 | 4.34 | 3.96 | 3.92 |
| M5 | 0.8 | 4.98 | 4.83 | 4.43 | 4.38 |
| M6 | 1 | 5.97 | 5.82 | 5.3 | 5.25 |
| M7 | 1 | 6.97 | 6.82 | 6.3 | 6.25 |
| M8 | 1.25 | 7.96 | 7.79 | 7.12 | 7.07 |
| M9 | 1.25 | 8.96 | 8.79 | 7.12 | 8.07 |
| M10 | 1.5 | 9.96 | 9.77 | 8.97 | 8.91 |
| M11 | 1.5 | 10.97 | 10.73 | 9.97 | 9.91 |
| M12 | 1.75 | 11.95 | 11.76 | 10.79 | 10.73 |
| M14 | 2 | 13.95 | 13.74 | 12.63 | 12.56 |
| M16 | 2 | 15.95 | 15.74 | 14.63 | 14.56 |
| M18 | 2.5 | 17.95 | 17.71 | 16.31 | 16.23 |
| M20 | 2.5 | 19.95 | 19.71 | 18.31 | 18.23 |
| M22 | 2.5 | 21.95 | 21.71 | 20.31 | 20.23 |
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