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Elijah Reed
Elijah Reed

BS 8666 Shape Codes: Best Practices and Tips for Rebar Scheduling and Bending


BS 8666 Shape Codes: A Guide for Rebar Scheduling and Bending




If you are involved in the design, fabrication or installation of steel reinforcement for concrete structures, you need to be familiar with BS 8666 shape codes. These are a set of standardised symbols and formulas that specify the dimensions, angles and bends of reinforcing bars. They are essential for ensuring that the rebar conforms to the design specifications and meets the structural performance requirements.




bs 8666 shape codes pdf download



In this article, we will explain what BS 8666 shape codes are, how they work, and how to use them effectively. We will also highlight the main changes in the latest update of BS 8666:2020, which aligns the standard more closely with BS EN 1992-1-1 (Eurocode 2). Finally, we will discuss the benefits and challenges of using shape codes, and provide some useful tips and resources for rebar scheduling and bending.


Shape codes overview




Shape codes are a way of representing the geometry of reinforcing bars using numbers, letters and symbols. They are used to communicate the required shape and dimensions of rebar between designers, fabricators and installers. They also help to avoid confusion, errors and disputes that may arise from using different terminology or units.


Each shape code consists of two parts: a number that indicates the type of shape, and a letter that indicates the grade of steel. For example, shape code 12C means a bar with two bends in opposite directions (shape code 12) made of grade B500B or B500C steel (letter C).


The shape code is followed by a series of values that specify the length and angle of each segment or bend of the bar. These values are based on standard formulas that take into account the radius, diameter and projection of the bends. For example, shape code 12C A=1000 B=500 C=135 means a bar with two bends in opposite directions (shape code 12) made of grade B500B or B500C steel (letter C) with a length of A=1000 mm between the end and the first bend, a length of B=500 mm between the two bends, and an angle of C=135 degrees between the two segments.


The following table shows a list of shape codes with diagrams and formulas according to BS 8666:2020. The table also shows the minimum values for A, B, C, D and E for each shape code.