Black steel tolerances according to AS 3679.1:2016
Permissible Variations in Cross-Sectional Dimensions for Rounds and Squares (mm)
| 1 |
≤ 25 |
+ 0.25 - 0.25 |
0.40 |
| 2 |
> 25 ≤ 30 |
+ 0.30 - 0.30 |
0.45 |
| 3 |
> 30 ≤ 40 |
+ 0.40 - 0.40 |
0.60 |
| 4 |
> 40 ≤ 50 |
+ 0.50 - 0.50 |
0.75 |
| 5 |
> 50 ≤ 60 |
+ 0.60 - 0.60 |
0.90 |
| 6 |
> 60 ≤ 70 |
+ 0.70 - 0.70 |
1.05 |
| 7 |
> 70 ≤ 80 |
+ 0.80 - 0.80 |
1.20 |
| 8 |
> 80 ≤ 100 |
+ 0.90 - 0.90 |
1.35 |
| 9 |
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|
|
Width Tolerances for Flats (mm)
| 1 |
≤ 25 |
+ 0.40 - 0.40 |
| 2 |
> 25 ≤ 50 |
+ 0.80 - 0.80 |
| 3 |
> 50 ≤ 100 |
+ 1.60 - 0.80 |
| 4 |
> 100 ≤ 150 |
+ 2.40 - 1.60 |
| 5 |
> 150 ≤ 200 |
+ 3.20 - 3.20 |
| 6 |
> 200 ≤ 300 |
+ 3.20 - 3.20 |
| 7 |
|
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| 8 |
|
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| 9 |
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Thickness Tolerances for Flats (mm)
| 1 |
|
Specified thickness |
Specified thickness |
Specified thickness |
Specified thickness |
Specified thickness |
| 2 |
|
|
≥6 ≤12 |
>12 ≤25 |
>25 ≤50 |
>50 |
| 3 |
≤ 25 |
0.2 |
0.2 |
0.25 |
- |
- |
| 4 |
> 25 ≤ 50 |
0.2 |
0.3 |
0.4 |
0.8 |
- |
| 5 |
> 50 ≤ 100 |
0.2 |
0.4 |
0.5 |
0.8 |
1.2 |
| 6 |
> 100 ≤ 150 |
0.25 |
0.4 |
0.5 |
0.8 |
1.6 |
| 7 |
> 150 ≤ 200 |
0.25 |
0.4 |
0.5 |
0.8 |
- |
| 8 |
> 200 ≤ 300 |
- |
0.4 |
0.5 |
0.8 |
- |
| 9 |
|
|
|
|
|
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Permissible Variations in Cross-Sectional Dimensions for Angles – Tolerance on Leg Length and Out-Of-Square (mm)
| 1 |
|
Leg Length |
Leg Length |
Out-of-square (s) |
| 2 |
|
Over |
Under |
|
| 3 |
≤ 40 |
2.5 |
1.5 |
0.25 |
| 4 |
> 40 ≤ 75 |
2.5 |
1.5 |
0.4 |
| 5 |
> 75 ≤ 125 |
3 |
3 |
0.5 |
| 6 |
> 125 ≤ 150 |
3 |
3 |
0.5 |
| 7 |
> 150 |
5 |
3 |
0.5 |
| 8 |
|
|
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Permissible Variations in Cross-Sectional Dimensions for Angles – Thickness Tolerance (mm)
| 1 |
≤ 10 |
+ 0.5 - 0.5 |
| 2 |
> 10 ≤ 15 |
+ 0.7 - 0.70 |
| 3 |
> 15 ≤ 25 |
+ 1.0 - 1.00 |
| 4 |
> 25 |
+ 1.5 - 1.50 |
| 5 |
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