习惯号数
低碳钢丝
(铁丝) 电镀锌钢丝
4 6 6 22.2 50 8
5 5.5 5.5 18.7 50 9
6 5 5 15.4 50 10
7 4.5 4.5 12.5 50 11
8 4 4 9.87 50 12
9 3.5 3.5 7.55 50 13
10 3 3 5.55 50 14
11 2.8 2.8 4.82 50 15
12 2.5 2.5 3.85 50 16
13 2.2 2.2 2.98 50 10.24 17
14 2 2 2.47 25 2.048 18
15 1.8 1.8 2 25 9.765625 19
16 1.6 1.6 1.58 25 20
17 1.4 1.4 1.21 25 21
18 1.2 1.2 0.888 25 2.701 22
19 1 1 0.617 25 0.5402 23
20 0.9 0.9 0.499 25 0.3406