How to use a rebar bender
Updated: 23 October 2026
You already have a bench pin, and the first pull is the moment the plate either stays put or climbs off the timber. How to use a rebar bender, here, is a short sequence: fix the plate, mark the bar, bend it cold in one pull, then check the angle after it springs. The nine listings are on the [rebar bender comparison](/hub/diy-supplies/rebar-bender). The method follows the Concrete Society’s notes on site bending and the Collins note on spring-back. We did not run a workshop trial. A qualifying purchase can earn a commission at no extra cost to you.
You already have a bench pin, and the first pull is the moment the plate either stays put or climbs off the timber.
You already have a bench pin, and the first pull is the moment the plate either stays put or climbs off the timber. How to use a rebar bender, here, is a short sequence: fix the plate, mark the bar, bend it cold in one pull, then check the angle after it springs. The nine listings are on the rebar bender comparison. The method follows the Concrete Society’s notes on site bending and the Collins note on spring-back. We did not run a workshop trial. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Mount | Fixings | Handle | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Zhildmosin Zhildmosin bench bender, 4–14 mm | Plate, 22 by 15 cm base | Bolts not listed | 30 cm solid, 40 cm tube | 10.0 | about £74.99 | View offer |
| Best value |  MXBAOHENG MXBAOHENG bender, 1–14 mm | Must sit square | Not listed | 550 mm | 10.0 | about £57.00 | View offer |
| Alternative |  Mekturm Mekturm bench bender, 4–14 mm | Screws, solid bench | Screws described as included | Length not printed | 5.8 | about £42.88 | View offer |
On this page
Fix the plate before you pull
Bolt the base to something that does not lift. One Mekturm reviewer could not bend 12 mm on a scaffolding board and hired a hydraulic bender. Another bent 12 mm after the tool was screwed down. Mekturm describes screws as included. Zhildmosin includes a mounting plate on a 22 by 15 cm base and does not list a bolt set. Seat every fixing before the bar goes in. If the plate rocks, pack it square. If the set-up is not square, the bar twists: reseat it, and do not pull harder. Hands stay off the pin. Zhildmosin supplies a 40 cm tube with a 30 cm handle. If your own sheet forbids an extension, leave the handle as supplied.
Mark the bar and bend in one pull
Mark the point that has to land on the former before you seat the bar. These pins do not give you a length stop. Put the bar fully against the pin, check the free end has room to swing, and pull in one movement. Keep your stance to the side of the lever. If the plate lifts, stop. More force on a loose plate bends the bench, not the bar. For 12 mm bar the shape-code transcription uses a minimum mandrel of 48 mm, so an unmeasured pin can miss the finished leg. That diameter has its own page, bend 12 mm rebar.
Let go, then check the angle
Let the handle go and read the angle after the bar has sprung. Collins’ note on Table 2 says spring-back leaves a finished radius larger than the former. These listings do not print a number you can copy onto every B500 bar. Learn it on a scrap of the same bar, and overbend only as far as that scrap teaches you. Check the leg as well as the angle. If the scrap is short, move the mark before you touch the bar you need. Bend cold. The Concrete Society describes heating around 800–900°C as hard to control. A KATSU note on supported sections is not an instruction to heat B500.
Stop when the bar or the tool complains
Stop if the bar twists, and square the base before you pull again. Stop if you hear a crack or see a split on the inside of the bend. That bar is finished. Do not chase it with heat. Rebending bars that are already cast in, and any bar on a structural drawing, belongs with the people who scheduled it. Sixteen millimetre bar is outside these consumer pins. When a bolted pin has already failed, the money choice is hire a rebar bender.
Common questions
Do I have to bolt it down?
Yes, if the tool is a bench plate. UK reviews on Zhildmosin and Mekturm say it has to be fixed, and the 12 mm attempt on a scaffolding board failed. A vice is what DOODLREAM allows on its 1–4 mm desktop tool. That does not make a vice the mount for a 5 kg pin and a 12 mm bar.
Where do I mark the bar?
Mark the point that should meet the former, then prove the leg length on a scrap of the same bar. The radius and the spring-back both consume length, and these pins do not print a length stop. Move the mark after the scrap, not after the bar you meant to keep.
How do I allow for spring-back without a number from the listing?
Bend a scrap, let go, and measure the angle you actually got. Overbend the next piece only by the difference that scrap showed. Collins records that the finished radius is larger than the former. There is no single degree in these listings that is true for every B500 bar.
What if the bar twists?
Stop and square the set-up. MXBAOHENG’s UK review saw a slight twist when the base was not square, on flat bar. Pulling harder twists the leg further. Reseat the bar fully against the pin, check the plate does not rock, and try a scrap before the next real bend.
Should I heat a stiff bar?
No. Bend cold. The Concrete Society treats heating around 800–900°C as hard to control when people try to correct reinforcement. That is not a method for a new hook on B500 bar, and a KATSU note about supported sections is not a licence to warm ribbed bar with a torch.
When do I stop and hire?
Stop when the bar is 16 mm or larger, when a bend cracks, when the work is on a structural drawing, or when a bolted pin has already failed. Also stop if the bar is already cast into concrete and you are trying to rebend it. Day rates for a hired machine are a separate decision from the bending sequence.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Updated 23 October 2026.
- Concrete Society, cutting and bending on site (retrieved 23 October 2026)
- Concrete Society, straightening and rebending (retrieved 23 October 2026)
- Concrete Society, cold weather (retrieved 23 October 2026)
- BRC BS 8666:2020 shape-code chart (retrieved 23 October 2026)
- Collins BS 8666:2020 Table 2 transcription (retrieved 23 October 2026)
- CARES specification guide (retrieved 23 October 2026)
- HSE construction manual handling (retrieved 23 October 2026)
- RCM cranking iron and manual benders (retrieved 23 October 2026)