英制、公制螺紋及長度對照表
英制 |
公制 |
英制 |
公制 |
英制 |
公制 |
4# |
2.9 |
1-5/8 |
41.275 |
4-5/8 |
117.475 |
5# |
3.2 |
1-3/4 |
44.45 |
4-3/4 |
120.65 |
6# |
3.5 |
1-7/8 |
47.625 |
4-7/8 |
123.825 |
7# |
3.9 |
2 |
50.8 |
5 |
127 |
8# |
4.2 |
2-1/8 |
53.975 |
5-1/4 |
133.35 |
10# |
4.8 |
2-1/4 |
57.15 |
5-3/8 |
136.525 |
12# |
5.5 |
2-3/8 |
60.325 |
5-1/2 |
139.7 |
14# |
6.35 |
2-1/2 |
63.5 |
5-5/8 |
142.875 |
1/8 |
3.175 |
2-5/8 |
66.675 |
5-3/4 |
146.05 |
1/4 |
6.35 |
2-3/4 |
69.85 |
5-7/8 |
149.225 |
5/16 |
7.936 |
2-7/8 |
73.025 |
6 |
152.4 |
3/8 |
9.525 |
3 |
76.2 |
6-1/4 |
158.75 |
7/16 |
11.113 |
3-1/8 |
79.375 |
6-3/8 |
161.925 |
1/2 |
12.7 |
3-1/4 |
82.55 |
6-1/2 |
168.275 |
9/16 |
14.288 |
3-3/8 |
85.725 |
6-5/8 |
171.45 |
5/8 |
15.875 |
3-1/2 |
88.9 |
6-3/4 |
174.615 |
3/4 |
19.05 |
3-5/8 |
92.025 |
6-7/8 |
177.8 |
7/8 |
22.225 |
3-3/4 |
95.25 |
7 |
184.15 |
1 |
25.4 |
3-7/8 |
98.125 |
7-1/4 |
187.325 |
1-1/8 |
28.575 |
4 |
101.6 |
7-3/8 |
190.5 |
1-1/4 |
31.75 |
4-1/4 |
107.95 |
7-1/2 |
193.675 |
1-3/8 |
34.925 |
4-3/8 |
111.125 |
7-5/8 |
196.85 |
1-1/2 |
38.1 |
4-1/2 |
114.3 |
7-3/4 |
200.025 |
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美制螺絲對應公制螺絲級別:美制五級螺絲相當于公制8.8級螺絲、美制8級螺絲相當于公制10.9級螺絲,美制2級螺絲相當于公制4.8級螺絲,常用的美制螺絲有美制外六角螺絲、美制內六角螺絲、美制機螺釘以及美制吊環螺釘和美制螺母等。美制螺絲的牙紋為60°錐形,英制螺絲則為55°錐形。公制螺絲則為直螺紋。美制螺絲和英制螺絲多數情況下可以替代食用,應當注意的是1/2的規格,美制1/2規格螺絲牙距為每英寸13牙,英制則為12牙。這里所指的牙數是指1英寸(25.4mm)的螺紋上的牙數。