IS 2502 — Bending and Fixing of Reinforcement
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A drawing shows where the steel goes; IS 2502 is how it gets cut and bent to actually go there. It standardises the hooks, the bends and the allowances that turn a reinforcement drawing into a bar bending schedule (BBS) — the cutting list a bar-bender works to and a store issues steel against.
Hooks and bends
IS 2502 fixes the geometry of a standard hook and the minimum bend radii, so that a "hook" or a "crank" means the same thing to the designer, the estimator and the bender:
- A standard hook adds a defined length (commonly taken as about 9d, with a minimum) to a bar.
- Bends have minimum internal radii so the bar is not damaged when it is formed — the property that IS 1786's bend-and-rebend test guarantees the steel can take.
Why cut length is not just the drawing dimension
When a bar is bent, the steel on the outside of the bend stretches and the inside compresses, so the actual cut length is not simply the sum of the drawn dimensions. IS 2502 gives the bend deductions that account for this. Getting them right is the difference between a schedule that matches the site and one that leaves you short or over-ordered.
A rectangular stirrup, for example, has a cut length of roughly 2 × (a + b) + hooks − bend allowances, where a and b are the outside dimensions less cover (the full stirrup working). The two traps are using column cover on a beam and forgetting the bend deductions altogether.
What a bar bending schedule gives you
A BBS lists, for every bar mark: the diameter, the shape code, the number of bars, the cut length, and the total weight (via D²/162). Built properly it lets you:
- order steel accurately instead of by a rough per-sq-ft rule,
- cut and bend before the pour so the cage is ready on time,
- reconcile what was issued against what the drawing required, catching wastage.
The bar bending schedule — not a thumb rule — is what steel is ordered and cut against. A thumb rule like 4 kg per sq ft is only there to sanity-check that the BBS total looks right.
Frequently asked questions
What is IS 2502? The Indian Standard code of practice for bending and fixing of bars for concrete reinforcement — the basis of the bar bending schedule.
What is a bar bending schedule (BBS)? A tabulated list of every reinforcement bar — diameter, shape, number, cut length and weight — prepared from the drawings so steel can be ordered, cut, bent and reconciled accurately.
Why is cut length different from the drawing dimension? Because bending stretches and compresses the steel around the bend. IS 2502's bend deductions correct for this, so the cut length is the bent-shape perimeter minus the bend allowances plus the hooks.
How do you calculate the cutting length of a stirrup? Roughly 2 × (a + b) + hooks − bend deductions, where a and b are the outside dimensions less cover.
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CivilSite Editorial Team✓ Engineer reviewed
Written and reviewed by practising civil engineers with 10+ years of Indian residential construction experience.