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This page contains tolerances for cold drawn bars and hot rolled bars and squares. Size tolerances for cold drawn steel bars
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| Section | Size | Permitted variation |
| Round | >=6 <=18mm >18 <=30mm >30 <=50mm >50 <=80mm >80 <=100mm |
0.07mm 0.085mm 0.10mm 0.12mm 0.14mm |
| Square and Hexagon | >=6 <=18mm >18 <=30mm >30 <=50mm >50 <=80mm >80 <=105mm |
0.09mm 0.11mm 0.13mm 0.16mm 0.25mm |
| Flat (Width) | <=18mm >18 <=30mm >30 <=50mm >50 <=80mm >80 <=100mm >100 <=130mm >130 <=320mm |
0.11mm 0.13mm 0.16mm 0.19mm 0.22mm 0.35mm 1.0mm |
| Flat (Thickness) | <=18mm >18 <=30mm >30 <=50mm >50 <=80mm |
0.11mm 0.13mm 0.25mm 0.35mm |
Size Tolerances for Hot Rolled Round and Square Bars
| SIZE mm |
PERMITTED VARIATION
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PRIMARY – ROLLED
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RE-ROLLED
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| DIAMETER +/- mm | OUT OF SECTION mm | DIAMETER OR WIDTH ACROSS FLATS +/- mm | OUT OF SECTION mm | |
| <=16 | 0.2 | 0.3 | ||
| >16 <=26 | 0.3 | 0.5 | ||
| >26 <=38 | 0.4 | 0.6 | ||
| >38 <=51 | 0.5 | 0.8 | ||
| >51 <=64 | 0.6 | 0.9 | ||
| >64 <=76 | 0.7 | 1.1 | ||
| >76 <=90 | 1.3 | 2.0 | ||
| >90 <=120 | 1.5 | 2.3 | ||
| >120 <=160 | 2.0 | 3.0 | ||
| >160 <=200 | 2.5 | 3.8 | ||
| >200 | 3.0 | 4.5 | ||
Tolerances may be specified all plus or all minus, but are generally accepted to be all plus. Out of section is the difference between the maximum and minimum diameter or across flats measured at the same cross section.
Machining Allowance
This is 2% per side on re-rolled round bar, taken from minimum permissible diameter.
