Bending of stainless steel reinforcing bar is covered by BS8666:2005.

Below shows the shapes and formula covered in the standard.

Download leaflet BS8666 2005 detailing current bending shapes.

Shape Code 00

Shape Code 01

Shape Code 11
BS8666 Shape Code 00 BS8666 Shape Code 01 BS8666 Shape Code 11
Length = A (Cut to Length) Length = A (stock lengths) Length = A + (B) – 0.5r – d

Shape Code 12

Shape Code 13

Shape Code 14
BS8666 Shape Code 12 BS8666 Shape Code 13 BS8666 Shape Code 14
Length = A + (B) – 0.43r -1.2d Length = A + 0.57B + (C) – 1.6d Length = A + (C) – 4d

Shape Code 15

Shape Code 21

Shape Code 22
BS8666 Shape Code 15 BS8666 Shape Code 21 BS8666 Shape Code 22
Length = A + (C) Length = A + B + (C) – r -2d Length = A + B + C + (D) – 1.5r – 3d

Shape Code 23

Shape Code 24

Shape Code 25
BS8666 Shape Code 23 BS8666 Shape Code 24 BS8666 Shape Code 25
Length = A + B + (C) – r – 2d Length = A + B + (C) Length = A + B + (E)

Shape Code 26

Shape Code 27

Shape Code 28
BS8666 Shape Code 26 BS8666 Shape Code 27 BS8666 Shape Code 28
Length = A + B + (C) Length = A + B + (C) – 0.5r – d Length = A + B + (C) -0.5r – d

Shape Code 29

Shape Code 31

Shape Code 32
BS8666 Shape Code 29 BS8666 Shape Code 31 BS8666 Shape Code 32
Length = A + B + (C) – r – 2d Length = A + B + C + (D) – 1.5r – 3d Length = A + B + C + (D) – 1.5r – 3d

Shape Code 33

Shape Code 34

Shape Code 35
BS8666 Shape Code 33 BS8666 Shape Code 34 BS8666 Shape Code 35
Length = 2A + 1.7B + 2(C) – 4d Length = A + B + C + (E) – 0.5r – d Length = A + B + C + (E) – 0.5r – d

Shape Code 36

Shape Code 41

Shape Code 44
BS8666 Shape Code 36 BS8666 Shape Code 41 BS8666 Shape Code 44
Length = A + B + C + (D) – r – 2d Length = A + B + C + D + (E) – 2r – 4d Length = A + B + C + D + (E) – 2r – 4d

Shape Code 46

Shape Code 47

Shape Code 51
BS8666 Shape Code 46 BS8666 Shape Code 47 BS8666 Shape Code 51
Length = A + 2B + C + (E) Length = 2A + B + 2C + 1.5r – 3d Length = 2(A + B + (C)) – 2.5r – 5d

Shape Code 56

Shape Code 63

Shape Code 64
BS8666 Shape Code 56 BS8666 Shape Code 63 BS8666 Shape Code 64
Length = A + B + C + (D) + 2(E) – 2.5r – 5d Length =2A + 3B + 2(C)- 3r – 6d Length = A + B + C + 2D + E + (F) -3r – 6d

Shape Code 67

Shape Code 75

Shape Code 77
BS8666 Shape Code 67 BS8666 Shape Code 75 BS8666 Shape Code 77
Length = A Length =∏ (A – d) + B  Length = C ∏ (A – d)

Shape Code 98
BS8666 Shape Code 98
 Length = A + 2B + C + (D) – 2r – 4d

Reinforcing Bending Limitations.

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 Minimum dimensions

This translates to the following dimensions

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

Reinforcement Bending Schedule Notations:

  R Not covered by BS 86666 2005
T Grade 460A or 460B conforming to BS 4449 1997
D Grade 460A conforming to BS 4449 1997
H Grade B500, B500B or B500C conforming to BS 4449 2005
A Grade B500A conforming to BS 4449 2005
B Grade B500B or B500C conforming to BS 4449 2005
C   Grade B500C conforming to BS 4449 2005
S S A specified grade and type of stainless steel conforming to BS 6744 2001
X X Reinforcement of type not included in the above list having material properties that are defined in the design or contract specification.