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Bend 12 mm rebar on a manual pin

Updated: 23 October 2026

To bend 12 mm rebar, start from the size the UK reviews in this set actually argue about. Six millimetre rod sits inside the minis, and twenty millimetre bar is a different machine. Ribbed 12 mm bar needs a bench that does not lift and a former at least 48 mm across. A mini that stops at 6 mm is the wrong tool. The nine listings are on the [rebar bender comparison](/hub/diy-supplies/rebar-bender). Mandrel figures are the BS 8666:2020 Table 2 transcriptions from BRC and Collins, not a measurement of these pins. We did not bend 12 mm bar in a lab. A qualifying purchase can earn a commission at no extra cost to you.

To bend 12 mm rebar, start from the size the UK reviews in this set actually argue about. Six millimetre rod sits inside the minis, and twenty millimetre bar is a different machine.

Our top picks

Zhildmosin Zhildmosin bench bender, 4–14 mm

Best overall

Zhildmosin Zhildmosin bench bender, 4–14 mm
10.0/10about £74.99
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MXBAOHENG MXBAOHENG bender, 1–14 mm

Best value

MXBAOHENG MXBAOHENG bender, 1–14 mm
10.0/10about £57.00
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Mekturm Mekturm bench bender, 4–14 mm

Alternative

Mekturm Mekturm bench bender, 4–14 mm
5.8/10about £42.88
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On this page
  1. 1.12 mm is where these pins start to argue
  2. 2.What this capture actually says about 12 mm
  3. 3.The schedule wants a 48 mm former
  4. 4.A cranking iron is for a bar that is already sticking out

12 mm is where these pins start to argue

A 4–14 mm title looks as if 12 mm sits comfortably inside the range. On ribbed bar it is often the edge, not the middle. Shopmp’s GP-2, which is not in this set, limits a 25 mm radius core to ribbed bar at 12 mm and smooth bar at 14 mm. A 25 mm radius is a 50 mm diameter, and that seller still refuses ribbed bar past 12 mm. Our pins do not say what radius they use. Reading 14 mm as an easy 12 mm skips that split. BS 4449 is the bar standard for B500A, B500B and B500C. CARES says not to specify EN 10080 on its own. A cropper, up to about 12 mm, cuts the bar. It does not bend it.

What this capture actually says about 12 mm

Mekturm’s WQJ-1, stated at 4–14 mm and £42.88, is the worked example. One UK review bent 12 mm after the tool was screwed to a bench, with a tube slid over the handle. One could not bend 12 mm on a scaffolding board and hired a hydraulic bender. One says you must bolt it down and that shims change the radius. The star line is 2.9 from three ratings. So 12 mm on this listing meant yes on a solid bench and no on a board. Zhildmosin’s UK text names 14 mm steel, in a Wiltshire review, not 12 mm. The listing still states 4–14 mm, including deformed rods, at £74.99, with no former printed. MXBAOHENG’s UK review is 4 mm by 24 mm flat steel, not ribbed 12 mm, at £57.00.
Zhildmosin Zhildmosin bench bender, 4–14 mm

Testsieger

Zhildmosin Zhildmosin bench bender, 4–14 mm
10.0/10about £74.99
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The schedule wants a 48 mm former

Collins and the BRC shape-code chart give a minimum mandrel diameter of 48 mm for 12 mm bar, four times the bar size, and a scheduling radius of 24 mm. The end projection on that transcription is 125 mm for a general bend. Spring-back means the finished radius comes out slightly larger than the former. None of the nine listings prints a former diameter. A 180 degree headline does not fill that box. If you are bending to a shape code, measure the pin before you trust the title. A pin under 48 mm can kink 12 mm bar. RCM’s Kennedy 20/16 lists a 38 mm former, already under that 12 mm minimum. The pull itself is on how to use a rebar bender.

A cranking iron is for a bar that is already sticking out

A cranking iron is a different job from a bench full of loose links. RCM’s K 20580 is a handheld manual bender for 8, 10 and 12 mm, about 2.3 kg, listed around £54 excluding VAT. It is sold for bars that are already coming out of concrete, and it is not in this amazon.co.uk set. You hold it at the bar. You do not bolt it to a bench and walk a lever through a pile of cut links. NiQiWuKin’s 5/8 inch bender is the handheld in this capture, and it does not state 8, 10 and 12 mm the way the RCM iron does. If the 12 mm bar is loose, a bolted pin that covers the size is the closer tool. If the bars are already in the pour, a fabricator or a hired machine with a known former is the next step. Who the top pick is, among pins that do not print that former, is on best rebar bender.

Common questions

Which of these listings even claim 12 mm?
The 4–14 mm bench pins state a range that includes 12 mm: Mekturm, Zhildmosin, both CISSIYOG models, and MXBAOHENG’s 1–14 mm line. None of them prints a former. DOODLREAM stops at 1–4 mm and Singring at 1–6 mm. KATSU 165193 and NiQiWuKin do not print a rebar millimetre line.
What did UK reviewers manage at 12 mm?
On Mekturm, one reviewer bent 12 mm after screwing the tool to a bench. Another could not bend 12 mm on a scaffolding board and hired a hydraulic tool. Zhildmosin’s UK review names 14 mm steel, not 12 mm. A Swedish 12 mm remark on that listing is not a UK trial. MXBAOHENG’s UK review is flat bar, 4 mm by 24 mm.
What former does the schedule expect?
For 12 mm bar, the BRC and Collins transcriptions of BS 8666:2020 Table 2 give a minimum mandrel of 48 mm and a scheduling radius of 24 mm. The same transcription gives an end projection of 125 mm on a general bend. These amazon.co.uk listings do not print a former, so the title alone cannot show that you have met the table.
Will a 1–6 mm mini do 12 mm?
No. Singring’s capacity line is 1–6 mm rebar. The 12 mm figure on that listing is the diameter of the columns, with a 10.8 mm gap, which is the tool, not the bar. DOODLREAM stops at 1–4 mm steel rebar. A mini will not become a 12 mm bender because the title says rebar.
When is 12 mm already a hire?
When a pin bolted to a real bench still will not finish the bar, when you need a former you can name against 48 mm, or when the bars are cast in and you are trying to rebend them. A scaffold board that lifts is a mount problem first. Sixteen millimetre bar is already outside these pins.

Related pages

Rebar bender buying guide

Hire a rebar bender, or keep the bench pin

Rebar bender

Best rebar bender: the top pick and who should skip

How to use a rebar bender without lifting the bench

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Updated 23 October 2026.

  1. Concrete Society, cutting and bending on site (retrieved 23 October 2026)
  2. Concrete Society, straightening and rebending (retrieved 23 October 2026)
  3. Concrete Society, cold weather (retrieved 23 October 2026)
  4. BRC BS 8666:2020 shape-code chart (retrieved 23 October 2026)
  5. Collins BS 8666:2020 Table 2 transcription (retrieved 23 October 2026)
  6. CARES specification guide (retrieved 23 October 2026)
  7. HSE construction manual handling (retrieved 23 October 2026)
  8. RCM cranking iron and manual benders (retrieved 23 October 2026)