Dimensional tolerance of cold drawn steel bars
Grade of tolerance | 7grade (h7) |
8grade (h8) |
9grade (h9) |
10grade (h10) |
11grade (h11) |
12grade (h12) |
13grade (h13) |
|
---|---|---|---|---|---|---|---|---|
iameter – side – distance between opposite sides– thickness – width |
3≤…≤6 | 0 -0.012 |
0 -0.018 |
0 -0.030 |
0 -0.048 |
0 -0.075 |
0 -0.12 |
0 -0.18 |
6<…≤10 | 0 -0.015 |
0 -0.022 |
0 -0.036 |
0 -0.058 |
0 -0.090 |
0 -0.15 |
0 -0.22 |
|
10<…≤18 | 0 -0.018 |
0 -0.027 |
0 -0.043 |
0 -0.070 |
0 -0.11 |
0 -0.18 |
0 -0.27 |
|
18<…≤30 | 0 -0.021 |
0 -0.033 |
0 -0.052 |
0 -0.084 |
0 -0.13 |
0 -0.21 |
0 -0.33 |
|
30<…≤50 | 0 -0.025 |
0 -0.039 |
0 -0.062 |
0 -0.100 |
0 -0.16 |
0 -0.25 |
0 -0.39 |
|
50<…≤80 | 0 -0.030 |
0 -0.046 |
0 -0.074 |
0 -0.12 |
0 -0.19 |
0 -0.30 |
0 -0.46 |
|
80<…≤120 | 0 -0.035 |
0 -0.054 |
0 -0.087 |
0 -0.14 |
0 -0.22 |
0 -0.35 |
0 -0.54 |
Application of the tolerance grade
Shape and processing method | Round | Square | Hexagon | Flat | ||
---|---|---|---|---|---|---|
Grinding | Drawing | Cutting | ||||
Grade of tolerance | 7・8・9 | 8・9・10 | 11・12・13 | 10・11 | 11・12 | 12・13 |
※standard of tolerance grade・・・shortfall