UK Rebar Shape Codes

rebar bending shape codes

Bar Bending Shape Codes Overview

BS8666 is the British Standard rebar shape code list required to be adhered to when using steel to reinforce concrete in construction in the United Kingdom and Northern Ireland. The latest update, BS8666:2020 (from BS8666:2005) updates the standard more closely inline with BS EN 1992-1-1 Eurocode 2 (which you can download for free here).

As BSI puts it:

This revised British Standard specifies requirements for the scheduling, dimensioning, cutting and bending of steel for the reinforcement of concrete conforming to BS 4449, BS 4483 and BS 6744; and designed to BS EN 1992-1-1, BS EN 1992-2, BS EN 1992-3 and BS 8110.

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List of Rebar Shape Codes

shape code 00

BS Shape Code 00

Total Length (L)

L=A
shape code 01

BS Shape Code 01

Total Length (L)

L=A
shape code 11 - l bar

BS Shape Code 11 – L Bars

Total Length (L)

L=A + (B) – 0.5r – d
shape code 12

BS Shape Code 12

Total Length (L)

L=A + (B) – 0.43R–1.2d
shape code 13 - u bar

BS Shape Code 13 – U Bars

Total Length (L)

L=A + 0.57B +(C) – 1.6d
shape code 14

BS Shape Code 14

Total Length (L)

L=A + (C) – 4d
shape code 15

BS Shape Code 15

Total Length (L)

L=A + (C)
shape code 21

BS Shape Code 21

Total Length (L)

(L)= A + B + (C) – r – 2d
shape code 22

BS Shape Code 22

Total Length (L)

L=A + B + C + (D) – 1.5r – 3d
shape code 23

BS Shape Code 23

Total Length (L)

L=A + B + (C) – r – 2d
shape code 24

BS Shape Code 24

Total Length (L)

L=A + B + (C)
shape code 25

BS Shape Code 25

Total Length (L)

L=A + B + (E)
shape code 26

BS Shape Code 26

Total Length (L)

L=A + B + (C)
shape code 27

BS Shape Code 27

Total Length (L)

L=A + B + (C) – 0.5r – d
shape code 28

BS Shape Code 28

Total Length (L)

L=A + B + (C) – 0.5r – d
shape code 29

BS Shape Code 29

Total Length (L)

L=A + B + (C) – r – 2d
shape code 31

BS Shape Code 31

Total Length (L)

L=A + B + C + (D) – 1.5r – 3d
shape code 32

BS Shape Code 32

Total Length (L)

L=A + B + C + (D) – 1.5r – 3d
shape code 33

BS Shape Code 33

Total Length (L)

L=2A + 1.7B + 2(C) – 4d
shape code 34

BS Shape Code 34

Total Length (L)

L=A + B + C + (E) – 0.5r – d
shape code 35

BS Shape Code 35

Total Length (L)

L=A + B + C + (E) – 0.5r – d
shape code 36

BS Shape Code 36

Total Length (L)

L=A + B + C + (D) – r – 2d
shape code 41

BS Shape Code 41

Total Length (L)

L=A + B + C + D + (E) – 2r – 4d
shape code 41 flag link

BS Shape Code 41 Flag Link

Total Length (L)

L=A + B + C + D + (E) – 2r – 4d
shape code 44

BS Shape Code 44

Total Length (L)

L=A + B + C + D + (E) – 2r – 4d
shape code 46

BS Shape Code 46

Total Length (L)

L=A + 2B + C + (E)
shape code 47

BS Shape Code 47

Total Length (L)

L=2A + B + 2(C) + 1.5r – 3d
shape code 51

BS Shape Code 51 – Rebar Links

Total Length (L)

L=2(A + B + (C)) – 2.5r – 5d
shape code 56

BS Shape Code 56

Total Length (L)

L=A + B + C + D + 2(E) – 2.5r – 5d
shape code 63

BS Shape Code 63

Total Length (L)

L=2A + 3B + 2(C) – 3r – 6d
shape code 64

BS Shape Code 64

Total Length (L)

L=A+B+ C+2D+E + (F) – 3r – 6d
shape code 67

BS Shape Code 67

Total Length (L)

L=A
shape code 75

BS Shape Code 75

Total Length (L)

L= π (A–d) + B
shape code 77

BS Shape Code 77

Total Length (L)

L=C π (A – d)
shape code 98

BS Shape Code 98

Total Length (L)

L=A + 2B + C + (D) – 2r – 4d
Rebar bending tolerance

Minimum Scheduling Radii

d
Nominal Bar Diameter (mm)
r
Minimum Radius (mm)
M
Minimum Diameter of Bending Former (mm)
Minimum End Projection
General
Min. 5d Straight
Links Where Bends <150°
Min. 10d Straight
81632115115
102040120130
122448125160
163264130210
2070140190290
2587175240365
32112224305465
40140280380580
50175350475725

* 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 8mm does not conform to BS EN 1992-1.1:2004.

Radius of Bending: Maximum Values Requiring Bending

Bar Size810121620253240
Radius (m)2.753.54.257.514.030.043.058.0

Note: Bars to be formed to a redius exceeding the above dimensions will be supplied straight.

What’s the difference between 8666:2005 and 8666:2020?

There are only a few noticeable differences between 8666:2005 and 8555:2020. In fact, most people will only recognize the two additional shape codes added to the standard. Actually there have been some small amendments to 20 other shape codes, some new reference data added, some changes to dimensioning of cranked bars and obtuse angles, and Table 1 has been updated to include dowel bars.

 

What is BS8666:2020 Used for?

The BS standard for scheduling, dimensioning, cutting and bending of steel reinforcement is used by designers, specifiers, contractors, cut and bent rebar suppliers, and fabricators. It’s vital these standards are not only kept up-to-date with regards to modern construction standards, but also that they are noted and adhered to by the aforementioned parties. Having standardised rebar shape codes ensures that all parties concerned with using steel reinforcement have a specified standard to follow when using or requesting shapes for steel reinforcement.

Within a bar bending schedule, BS8666:2020 shape codes are used to identify specific shapes rebar must be produced to, as well as the minimum and maximum tolerances in bending shapes.

 

Does that mean I have to re-learn the rebar shape codes?

It is advised that you know what the new revisions are, certainly. However, the changes aren’t significant, and 2005 is still in use, providing it’s noted in the schedule. Rather than a revision of the shape codes, a few shapes have been added which aren’t commonly used currently, though it’s more important to understand the updates to the current shapes and the data and revised tolerances provided within.

If needed, copies of BS 8666:2020 can be purchased on the BSI website here

Stay focused on your project,
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Stay focused on your project,
let us handle the reinforcement.

Simple, accurate, and rapid solutions direct from a leading UK manufacturer.

Disclaimer: The information provided in this blog is for informative purposes only. The owner of this blog makes no representations as to the accuracy or completeness of any information on this site or found by following any link on this site. The owner will not be liable for any errors or omissions in this information nor for the availability of this information.

Always consult a qualified engineer and/or architect when designing or carrying out any construction project. Always work within regulations set out by your government, and within recommended safety guidelines.

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