Know Your Shape Code: Rebar Shape Codes Explained for SANS 282 Bending Schedules
A practical South African guide to understanding rebar shape codes and reading bending schedules with confidence.
If you have ever looked at a bending schedule and felt confused by shape codes like 51, 74 or 83, you are not alone. Understanding rebar shape codes is one of the simplest ways to improve accuracy, save time and avoid costly mistakes when ordering, checking or fixing reinforcement.
Why Rebar Shape Codes Matter
In South Africa, rebar shape codes are used in bending schedules to define how reinforcing bars must be cut and bent. Instead of describing every bar in full, the schedule uses a code number that matches a standard shape. Once the code is known, the dimensions shown as A, B, C, D, E or r tell the fabricator exactly what is needed.
This system keeps communication clear between engineers, quantity surveyors, contractors, steel fixers and suppliers. It also helps reduce fabrication errors, speeds up quotations, simplifies site checks and creates consistency from drawing office to yard to site.
Full Shape Code Reference
The full chart below gives a visual overview of the main rebar shape codes used on SANS 282 bending schedules. This is the best place to start when you need to confirm a shape quickly.
Common Shape Code Examples
Some of the most frequently used reinforcing bar shape codes include Shape Code 20 for a straight bar, Shape Code 37 for a single 90 degree bend, Shape Code 51 for a bent bar with a specified radius, Shape Code 60 for a closed rectangular link, Shape Code 74 for a closed link with returns, Shape Code 83 for a chair bar and Shape Code 86 for spiral or helix reinforcement.
Each of these shapes serves a different structural purpose. Straight bars are often used for longitudinal reinforcement, links and stirrups help confine concrete and hold main bars in place, chair bars support top steel, and spiral reinforcement is common in circular elements.
How To Read A Bending Schedule Correctly
A typical bending schedule includes the bar mark, bar diameter, steel type(Y/R), quantity, shape code and the bending dimensions. The most important step is to match the shape code to the diagram first and only then read the dimensions attached to that shape. Trying to interpret a bar from dimensions alone often causes confusion and leads to avoidable mistakes.
A good rule on site is simple: confirm the code, check the diagram, then measure only the legs shown on that shape. This makes off-loading checks faster and helps teams identify issues before steel is fixed into place.
It is also important to understand Shape Code 99. When a bar does not match one of the standard shapes, it should not be forced into the nearest code. Instead, it is scheduled as Shape Code 99 and accompanied by a fully dimensioned sketch. In simple terms, Shape Code 99 means “custom shape”. That sketch becomes essential because it tells fabrication exactly how the bar must be bent when no standard code applies. So whenever you see a bar that falls outside the usual shape family, the correct approach is not guesswork it is Shape Code 99 with a clear drawing.
Important Notes When Using Shape Codes
- All dimensions are measured externally.
- Bend radii are standard unless a radius is specifically shown.
- Each shape must match the correct dimensions exactly.
• Non-standard bars should be clearly sketched and communicated before fabrication.
Why This Matters For Your Project
Incorrect shape codes, missing dimensions or unclear schedules can lead to delays, remakes, wasted material and site frustration. The more complete and accurate the schedule is, the faster the reinforcement can be processed and delivered correctly.
For contractors and project teams, knowing your rebar shape codes means fewer queries, smoother procurement and better control over quality. For suppliers, it means quicker turnaround and more reliable fabrication. In short, understanding reinforcing bar shape codes is not just a technical detail – it is part of running a more efficient project
Key Takeaways
- Shape codes simplify how reinforcement is communicated on bending schedules.
- Always match the code to the diagram before checking dimensions.
- Clear schedules reduce errors, save time and improve fabrication accuracy.
- Visual references make site checks and ordering much easier.
Need help with your bending schedule or rebar requirements? Contact RMS today for cut and bend services, technical support and reliable supply. You can also explore the RMS Know Your Shape Code series for more practical insights that make ordering and working with reinforcement easier.
