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Flat Bars permissible variation in Thickness an Width for Hot-Wrought square edge and round edge Tab. A 2.3 ASTM A 29 - 04
| Width mm |
Thickness mm |
Permissible variations in
Width + mm |
| > 5 ≤ 6 |
> 6 ≤ 12 |
> 12 ≤ 25 |
> 25 ≤ 50 |
> 50 ≤ 75 |
> 75 |
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Permissible variations in Thickness + mm |
> |
≤ |
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≤ 25 |
0,18 |
0,20 |
0,25 |
… |
… |
… |
0,50 |
0,50 |
| > 25 |
≤ 50 |
0,18 |
0,30 |
0,40 |
0,80 |
… |
… |
1,00 |
1,00 |
| > 50 |
≤ 100 |
0,20 |
0,40 |
0,50 |
0,80 |
1,20 |
1,20 |
1,50 |
1,00 |
| > 100 |
≤ 150 |
0,25 |
0,40 |
0,50 |
0,80 |
1,20 |
1,20 |
2,50 |
1,50 |
| > 150 |
≤ 200 |
b) |
0,40 |
0,65 |
0,80 |
1,20 |
1,60 |
3,00 |
2,50 |
| b) Flats over 150 to 200 mm in width, are not available as hot-wrougt steel bars in thickness under 6 mm. |
| When a square is held against a face and an edge of square edge flat bar, the edge shall not deviate by more than 3° or 5% of the thickness. |
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| Tolerances in Sectional Dimensions for Round and Square Bars and Round-Cornered Square Bars Tab. A 2.1 ASTM A 29 - 04 |
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| Size mm |
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Tolerances from specified size, over and under |
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Out-of-round or Out-of-square section b) |
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mm or % a) |
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mm or % a) |
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≤ 7 |
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0,13 mm |
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0,20 mm |
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| > 7 |
≤ 11 |
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0,15 mm |
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0,22 mm |
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| > 11 |
≤ 15 |
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0,18 mm |
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0,27 mm |
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| > 15 |
≤ 19 |
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0,20 mm |
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0,30 mm |
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| > 19 |
≤ 250 |
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1 % |
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1,5 % |
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| a) The tolerance shall be rounded to the nearest tenth of a millimetre after calculation. |
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| b) Out-of-round is the difference between the maximum and the minimum diameters of the bar, measured at the same cross section. |
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| b) Out-of-round is the difference in the two dimensions at the same cross section of a square bar between opposite faces. |
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| Straightness Tolerances for Hot-Wrought Bars and Bar Size Sectionsa) Tab. A 2.10 ASTM A 29 - 04 |
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| Standard Tolerances |
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6 mm in any 1500 mm (1 mm / 250 mm) b) |
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| Special Tolerances |
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3 mm in any 1500 mm (1 mm / 500 mm) b) |
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| a) Because of warpage, straightness tolerances do not apply to bars if any subsequent heating operation or controlled cooling has been performed. |
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| b) Round to the nearest whole millimetre. |
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