Focus on Shape Codes to BS8666 2005 Page 4

For all shapes with two or more bends in the same or opposite directions (whether in the same plane or not), the overall dimension given on the schedule shall always include a minimum straight of 4d between the curved portion of the bends, as shown below.  The value of 'x' shall be not less than the following:

  1. 10d for bars not exceeding a nominal size of 16mm.
  2. 13d for nominal sizes greater than 16mm.

BS8666:2005 Figure 6 bar with more than one bend

This translates to the following dimensions

DiameterMinimum
6 60
8 80
10 100
12 120
16 160
20 260
25 325
32 416
40 520