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Bar Bending Tolerances

Minimum scheduling radii, former diameters and bend allowances

Nominal Size of Bar, d (mm) Minimum Radius for Scheduling, r (mm) Minimum diameter of bending former, M (mm) Minimum End Projection, P
General (min 5 d straight), including links where bend >= 150deg (mm) Links where bend < 150 deg (min 10d straight) (mm)
6 12 24 110 110
8 16 32 115 115
10 20 40 120 130
12 24 48 125 160
16 32 64 130 210
20 70 140 190 290
25 87 175 240 365
32 112 224 305 465
40 140 280 380 580
50 175 350 475 725
The minimum end projections for smaller bars is governed by the practicalities of bending bars.
NOTE 1 Due to "spring back" the actual radius of bend will be slightly greater than half the diameter of former.
NOTE 2 BS 4449:2005 grade B500A in sizes below 8 mm does not conform to BS EN 1992-1.1:2004.
Tolerances on Cutting and Bending Dimensions

The tolerances for cutting and/or bending dimensions shall be in accordance with the table below and shall be taken into account when completing the schedule. The end anchorage or the dimension in parenthesis in the shape codes specified on Typical Bar Bends shall be used to allow for any permissible deviations resulting from cutting and bending.

Cutting and Bending Processes Tolerance (mm)
Cutting of straight lengths (including reinforcement for subsequent bending) +25, -25
Bending:
≤ 1000mm +5, -5
> 1000mm to ≤ 2000mm +5, -10
> 2000mm +5, -25
Length of Bars in Fabric +25, -25, or 0.5% of the length (whichever is greater)
Tolerances for shape code 01, stock lengths, shall be subject to the relevant product standard, e.g. BS 4449:2005.

 

Source

BSI British Standard documentation


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