Dimensional tolerance of cold drawn steel bars

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