| 1 2 3 4 |
針車螺紋的下孔徑和擠壓絲攻的精度番號 |
| 外徑 |
牙距 |
2級用
精度番號 |
飽和率下孔徑(mm) |
| 100% |
90% |
80% |
70% |
| SM3/32 |
56 |
4 |
2.07 |
2.10 |
2.13 |
2.17 |
| SM1/8 |
48 |
5 |
2.82 |
2.85 |
2.89 |
2.92 |
| 44 |
5 |
2.78 |
2.82 |
2.86 |
2.90 |
| 40 |
5 |
2.74 |
2.79 |
2.83 |
2.87 |
| SM9/64 |
40 |
5 |
3.14 |
3.18 |
3.23 |
3.27 |
| SM11/64 |
40 |
6 |
3.93 |
3.98 |
4.02 |
4.06 |
| 32 |
6 |
3.83 |
3.88 |
3.93 |
3.99 |
| SM3/16 |
40 |
6 |
4.33 |
4.37 |
4.42 |
4.46 |
| 32 |
6 |
4.22 |
4.28 |
4.33 |
4.38 |
| 28 |
6 |
4.15 |
4.21 |
4.27 |
4.33 |
| 24 |
6 |
4.04 |
4.11 |
4.19 |
4.26 |
| SM13/64 |
32 |
6 |
4.62 |
4.67 |
4.73 |
4.78 |
| SM7/32 |
32 |
6 |
5.02 |
5.07 |
5.12 |
5.18 |
| SM15/64 |
28 |
6 |
5.34 |
5.40 |
5.46 |
5.52 |
| SM1/4 |
40 |
6 |
5.92 |
5.96 |
6.00 |
6.05 |
| 28 |
6 |
5.73 |
5.79 |
5.86 |
5.92 |
| 24 |
6 |
5.63 |
5.70 |
5.77 |
5.85 |
| SM9/32 |
28 |
7 |
6.53 |
6.59 |
6.65 |
6.71 |
| 20 |
7 |
6.28 |
6.37 |
6.45 |
6.54 |
| SM5/16 |
28 |
7 |
7.32 |
7.38 |
7.44 |
7.51 |
| 24 |
7 |
7.22 |
7.29 |
7.36 |
7.43 |
| 18 |
7 |
6.98 |
7.07 |
7.17 |
7.27 |
| SM11/32 |
28 |
7 |
8.11 |
8.18 |
8.24 |
8.30 |
| SM3/8 |
28 |
7 |
8.91 |
8.97 |
9.03 |
9.09 |
| 18 |
8 |
8.57 |
8.66 |
8.75 |
8.85 |
| SM7/16 |
28 |
8 |
10.5 |
10.56 |
10.62 |
10.68 |
| 16 |
8 |
10.03 |
10.14 |
10.25 |
10.36 |
| SM1/2 |
28 |
8 |
12.08 |
12.14 |
12.21 |
12.27 |
| 20 |
8 |
11.84 |
11.92 |
12.01 |
12.10 |
| 12 |
9 |
11.26 |
11.40 |
11.55 |
11.69 |
| SM9/16 |
20 |
9 |
13.42 |
13.51 |
13.60 |
13.68 |
|
| ﹝注﹞ |
1.本表的寸法為參考用，請先試著加工後再決定下孔徑。
2.精度番號是以母螺紋的公差 80%為目標做決定。 |
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