| 1 2 3 4 |
美制螺紋的下孔徑和擠壓絲攻的精度番號 |
| 規
格 |
2B級用
精度番號 |
飽和率下孔徑(mm) |
| 100% |
90% |
80% |
70% |
| No.1-64UNC |
4 |
1.63 |
1.65 |
1.67 |
1.70 |
| No.2-58UNC |
4 |
1.93 |
1.95 |
1.98 |
2.00 |
| No.3-48UNC |
4 |
2.21 |
2.24 |
2.27 |
2.30 |
| No.4-40UNC |
5 |
2.49 |
2.52 |
2.56 |
2.59 |
| No.5-40UNC |
5 |
2.82 |
2.85 |
2.89 |
2.92 |
| No.6-32UNC |
5 |
3.05 |
3.10 |
3.14 |
3.19 |
| No.8-32UNC |
6 |
3.72 |
3.76 |
3.81 |
3.85 |
| No.10-24UNC |
6 |
4.23 |
4.29 |
4.35 |
4.41 |
| No.12-24UNC |
6 |
4.89 |
4.95 |
5.01 |
5.07 |
| 1/4-20UNC |
6 |
5.63 |
5.70 |
5.77 |
5.85 |
| 5/16-18UNC |
7 |
7.14 |
7.22 |
7.30 |
7.38 |
| 3/8-16UNC |
7 |
8.62 |
8.71 |
8.80 |
8.89 |
| 7/16-14UNC |
8 |
10.08 |
10.19 |
10.29 |
10.39 |
| 1/2-13UNC |
8 |
11.59 |
11.7 |
11.81 |
11.92 |
| 9/16-12UNC |
10 |
13.09 |
13.21 |
13.33 |
13.45 |
| 5/8-11UNC |
11 |
14.55 |
14.68 |
14.81 |
14.94 |
| 3/4-10UNC |
12 |
17.61 |
17.75 |
17.90 |
18.04 |
|
|
| 規
格 |
2B級用
精度番號 |
飽和率下孔徑(mm) |
| 100% |
90% |
80% |
70% |
| No.0-80UNF |
3 |
1.34 |
1.36 |
1.38 |
1.40 |
| No.1-72UNF |
4 |
1.65 |
1.67 |
1.69 |
1.71 |
| No.2-64UNF |
4 |
1.96 |
1.98 |
2.00 |
2.03 |
| No.3-56UNF |
4 |
2.26 |
2.28 |
2.31 |
2.34 |
| No.4-48UNF |
5 |
2.54 |
2.57 |
2.60 |
2.63 |
| No.5-44UNF |
5 |
2.85 |
2.88 |
2.91 |
2.95 |
| No.6-40UNF |
5 |
3.15 |
3.18 |
3.22 |
3.25 |
| No.8-36UNF |
6 |
3.77 |
3.81 |
3.85 |
3.89 |
| No.10-32UNF |
6 |
4.38 |
4.42 |
4.47 |
4.51 |
| No.12-28UNF |
6 |
4.97 |
5.02 |
5.07 |
5.13 |
| 1/4-28UNF |
6 |
5.84 |
5.89 |
5.94 |
5.99 |
| 5/16-24UNF |
7 |
7.34 |
7.40 |
7.46 |
7.52 |
| 3/8-24UNF |
7 |
8.92 |
8.98 |
9.04 |
9.10 |
| 7/16-20UNF |
8 |
10.39 |
10.46 |
10.54 |
10.61 |
| 1/2-20UNF |
8 |
11.98 |
12.05 |
12.12 |
12.20 |
| 9/16-18UNF |
9 |
13.49 |
13.57 |
13.65 |
13.73 |
| 5/8-18UNF |
9 |
15.06 |
15.14 |
15.22 |
15.30 |
| 3/4-16UNF |
10 |
18.15 |
18.24 |
18.33 |
18.42 |
| 7/8-14UNF |
11 |
21.20 |
21.30 |
21.40 |
21.50 |
|
| ﹝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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