SM機械螺絲，屬於SM針車螺絲，縫紉機，裁縫機，業界較常使用的特殊螺紋，大部分螺絲均需訂製討論，檢附SM針車用螺絲規格表如下表格供參考。
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| SM 機械螺絲 2A (60º) | |||||
| SM 針 車 用 規 格 | |||||
| 規格 | 牙數 | 外徑（D） | 輾造徑 | ||
| T | MAX | MIN | MAX | MIN | |
| 5/64 | 64 | 1.964 | 1.867 | 1.690 | 1.680 |
| 3/32 | 56 | 2.361 | 2.267 | 2.060 | 2.040 |
| 1/8 | 48 | 3.155 | 3.041 | 2.800 | 2.780 |
| 1/8 | 44 | 3.155 | 3.041 | 2.770 | 2.750 |
| 1/8 | 40 | 3.155 | 3.041 | 2.730 | 2.710 |
| 9/64 | 40 | 3.542 | 3.432 | 3.130 | 3.100 |
| 11/64 | 40 | 4.336 | 4.226 | 3.920 | 3.890 |
| 11/64 | 32 | 4.336 | 4.226 | 3.810 | 3.790 |
| 3/16 | 40 | 4.732 | 4.602 | 4.310 | 4.280 |
| 3/16 | 32 | 4.732 | 4.602 | 4.220 | 4.190 |
| 3/16 | 28 | 4.732 | 4.602 | 4.140 | 4.110 |
| 3/16 | 24 | 4.732 | 4.602 | 4.040 | 4.010 |
| 13/64 | 32 | 5.126 | 4.976 | 4.600 | 4.570 |
| 7/32 | 32 | 5.526 | 5.376 | 5.010 | 4.980 |
| 15/64 | 28 | 5.923 | 5.773 | 5.320 | 5.290 |
| 1/4 | 40 | 6.330 | 6.160 | 5.900 | 5.870 |
| 1/4 | 28 | 6.330 | 6.160 | 5.720 | 5.690 |
| 1/4 | 24 | 6.330 | 6.160 | 5.620 | 5.590 |
| 9/32 | 28 | 7.114 | 6.964 | 6.510 | 6.480 |
| 9/32 | 20 | 7.114 | 6.964 | 6.280 | 6.250 |
| 5/16 | 24 | 7.910 | 7.727 | 7.210 | 7.180 |
| 5/16 | 18 | 7.910 | 7.727 | 6.970 | 6.940 |
