Round Steel Bar Tolerance: BS 970-3 VS ISO 286-2

As you may know, in steel industry, there must be some dimension and sizes for one product or a project. And for each size of product, there will be some standard and tolerance requirements. Here in this post we share the different round steel bar tolerance requirements between BS 970-3 and ISO 286-2 standard.

round steel bar tolerance bs 970 vs iso 286

  1. Cold Drawn Round Steel Bar Tolerance &  Steel Hexagon, Flat Tolerance (BS 970-3)
Tolerances for Cold Drawn Bar
SectionSize, diameter or width across flatsPermitted variation
mmmm
Round≥6 ≦ 18
> 18 ≦ 30
> 30 ≦ 50
> 50 ≦ 80
> 80 ≦ 100
+ 0 to – 0.070
+ 0 to – 0.085
+ 0 to – 0.100
+ 0 to – 0.120
+ 0 to – 0.140
Square and
hexagon
≥ 6 ≦ 18
> 18 ≦ 30
> 30 ≦ 50
> 50 ≦ 80
> 80 ≦ 105
+ 0 to – 0.090
+ 0 to – 0.110
+ 0 to – 0.130
+ 0 to – 0.160
+ 0 to – 0.250
Flat (width)< 18
> 18 ≦ 30
> 30 ≦ 50
> 50 ≦ 80
> 80 ≦ 100
> 100 ≦ 130
> 130 ≦ 160
> 160 ≦ 320
+ 0 to – 0.110
+ 0 to – 0.130
+ 0 to – 0.160
+ 0 to – 0.190
+ 0 to – 0.220
+ 0 to – 0.350
+ 0 to – 1.00
+ 1.00 to – 1.00
Flat (thickness)< 18
> 18 ≦ 30
> 30 ≦ 50
> 50 ≦ 80
+ 0 to – 0.110
+ 0 to – 0.130
+ 0 to – 0.250
+ 0 to – 0.350

2. Turned Round Steel Bar Tolerances (BS 970-3)

Tolerances for Turned Bars
Size, diameterPermitted variation
mmmm
≧ 6 ≦ 18
> 18 ≦ 30
> 30 ≦ 50
> 50 ≦ 80
> 80 ≦ 120
> 120 ≦ 180
> 180 ≦ 250
> 250 ≦ 315
> 315 ≦ 400
> 400
+ 0 to – 0.070
+ 0 to – 0.085
+ 0 to – 0.100
+ 0 to – 0.120
+ 0 to – 0.140
+ 0 to – 0.160
+ 0 to – 0.185
+ 0 to – 0.210
+ 0 to – 0.230
+ 0 to – 0.250

3. Precision Round Steel Bar Tolerances (BS 970-3)

Tolerances for Precision Steel Bars
SectionSize,
diameter
Permitted overall variation
Class AClass BClass C
mmmmmmmm
Round≧ 6 <750.050.0250.013

4. Bright Round Steel Bar Tolerance (BS EN ISO 286-2 )

Round Steel Bar Tolerance ISO “H” Series in MM
NOMINAL SIZEh5h6h7h8h9H10H11h12
DIAMETER mm
~ to 3+0.004/0+0.006/0+0.01/0+0.014/0+0.025/0+0.04/0+0.06/0+0.1/0
over 3 to 6+0.005/0+0.008/0+0.012/0+0.018/0+0.03/0+0.048/0+0.075/0+0.12/0
over 6 to 10+0.006/0+0.009/0+0.015/0+0.022/0+0.036/0+0.058/0+0.09/0+0.15/0
over 10 to 18+0.008/0+0.011/0+0.018/0+0.027/0+0.043/0+0.07/0+0.11/0+0.18/0
over 18 to 30+0.009/0+0.013/0+0.021/0+0.033/0+0.052/0+0.084/0+0.13/0+0.21/0
over 30 to 50+0.011/0+0.016/0+0.025/0+0.039/0+0.062/0+0.1/0+0.16/0+0.25/0
over 50 to 80+0.013/0+0.019/0+0.03/0+0.046/0+0.074/0+0.12/0+0.19/0+0.3/0
over 80 to 120+0.015/0+0.022/0+0.035/0+0.054/0+0.087/0+0.14/0+0.22/0+0.35/0
over 120 to 180+0.018/0+0.025/0+0.04/0+0.063/0+0.1/0+0.16/0+0.25/0+0.4/0
over 180 to 250+0.02/0+0.029/0+0.046/0+0.072/0+0.115/0+0.185/0+0.29/0+0.46/0

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2016-12-04T15:43:07+00:00 October 12th, 2015|Comments Off on Round Steel Bar Tolerance: BS 970-3 VS ISO 286-2