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Tolerance

The tolerances which are normally acceptable according to IS : 811-1987 and/or other equivalent standards for the cold rolled sections are as follows:

1)  Thickness Tolerance (IS : 852-1985)
a)  Hot Rolled Sections

Thickness margin (in mm)

Tolerance on thickness (in mm)

≤ 2.00

±0.13

> 2.00 ≤ 2.50

±0.14

> 2.50 ≤ 3.00

±0.15

> 3.00 ≤ 4.00

±0.17

> 4.00 ≤ 5.00

±0.18

> 5.00 ≤ 6.00

±0.20

> 6.00 ≤ 8.00

±0.22

 
b)  Cold Rolled Sections

Thickness margin (in mm)

Tolerance on thickness (in mm)

≤ 0.40

±0.04

> 0.40 ≤ 0.60

±0.05

> 0.60 ≤ 0.80

±0.06

> 0.80 ≤ 1.00

±0.07

> 1.00 ≤ 1.20

±0.08

> 1.20 ≤ 1.60

±0.10

> 1.60 ≤ 2.00

±0.12

> 2.00 ≤ 2.50

±0.14

> 2.50 ≤ 3.00

±0.16

 
2)  Cross-sectional Dimensional Tolerance*
Cross-sectional Dimensional Tolerance
a)  For dimensions between radius and edge (E.g. C and D in Figure)

Thickness(mm)

Dimension Range (in mm)

< 40

> 40 ≤ 100

> 100 ≤ 200

> 200 ≤ 400

> 400

≤ 1.5

0.50

0.50

0.75

1.00

 

1.5 ≤ 3

0.75

0.75

1.00

1.25

1.75

3 ≤ 6

1.00

1.00

1.25

1.75

2.00

6 ≤ 8

 

1.25

1.50

2.00

2.50

 
b)  For dimensions between radii (E.g. A and B in Figure)

Thickness(mm)

Dimension Range (in mm)

< 40

> 40 ≤ 100

> 100 ≤ 150

> 150 ≤ 200

> 200

≤ 1.5

0.75

0.75

1.00

 

 

1.5 ≤ 3

0.80

1.00

1.25

1.50

 

3 ≤ 6

1.00

1.25

1.50

1.75

2.00

6 ≤ 8

1.25

1.50

1.75

2.00

2.25

* These tolerances apply to the whole length of the sections with the exception of around 100 mm length on either ends, which are influenced by the cut.
 
3)  Straightness Tolerance
     1/600 (0.16% of total length) on X-X and Y-Y axes
 
4)  Torsion Tolerance
     2°/1000 mm length
 
5)  Length Tolerance

Length (in mm)

Tolerance (in mm)

< 3000

± 1.0

> 3000 ≤ 6000

± 1.5

> 6000 ≤ 10000

± 3.0

 
6)  Angle Tolerance

Length of smallest side of angle (in mm)

Tolerance (in mm)

< 30

± 2°

> 30 ≤ 50

± 1° 45’

> 50 ≤ 80

± 1° 30’

> 80 ≤ 120

± 1° 15’

> 120

± 1°

 
Closer tolerances than the above mentioned tolerances can be achieved as per the requirement of the customer.
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