尺寸系列
公称直径
(mm) (ins) |
理论直径
(mm) |
钢球单重
(g) |
直径公差
(mm) |
| 20 |
¾ |
20.8 |
37 |
±1.5 |
| 25 |
1 |
26.0 |
72 |
+2.0
-2.0 |
| 30 |
1¼ |
31.2 |
125 |
| 40 |
1½ |
41.6 |
296 |
+2.5/-1.5 |
| 50 |
2 |
52.0 |
578 |
+3.0
-1.5 |
| 60 |
2½ |
62.4 |
999 |
| 65 |
|
67.6 |
1,270 |
| 70 |
2¾ |
72.8 |
1,586 |
+3.5/-1.5 |
| 75 |
3 |
78.0 |
1,951 |
+4.0
-2.0 |
| 80 |
3¼ |
83.2 |
2,367 |
| 90 |
3½ |
88.4 |
2,839 |
+1.5
-5.0 |
| 100 |
4 |
98.8 |
3,964 |
| 125 |
5 |
124.8 |
7,989 |
+2.5
-5.5 |
| 140 |
5½ |
138.0 |
10,108 |
| 150 |
6 |
153.0 |
13,865 |
|
