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Black metal mandrel kit with five curved forms for 12mm rigid tubing

Bitspower

Bitspower BP-CMMK12-MBK 12mm OD Rigid Tubing Mandrel Kit 30 60 90 180 360° DIY Cooling

SKU CH-M3YC-PQ6Q0 MPN BP-CMMK12-MBK

Mandrel kit for bending 12 mm OD rigid tubing with 30, 60, 90, 180 and 360 degree forms laser-marked in one-degree increments

  • Product typeTubing
  • Bends 12 mm rigid tubing precisely
  • Five mandrels cover 30 60 90 180 360 degree angles
  • Laser-etched radius markings guide every bend
  • One-degree hash marks enable exact alignment
  • Complete kit simplifies custom loop builds

Rigid Tubing Bend Kit

The Bitspower BP-CMMK12-MBK is a mandrel kit built for 12mm outer diameter rigid tubing. It gives DIY liquid-cooling builders the forming tools needed to shape hard tubes without kinks or flattening. The kit suits enthusiasts assembling custom loops who want repeatable bends on acrylic or PETG tubing.

Bend Radius Selection

The set includes mandrels for 30, 60, 90, 180, and 360 degree bends, replacing improvised methods such as spring inserts or heat-gun guesswork. Each mandrel is laser marked with its bend radius and hash marks in 1 degree increments so you can match the exact angle your loop layout demands. The jump is worth it when a clean, measurable bend radius matters more than trial and error.

Sustained Forming Accuracy

Under repeated use the laser markings stay legible and the mandrels hold their shape, letting you produce consistent radii across many tubes in a single build session. The rigid construction resists deformation when tubing is pushed through tight curves, so the last bend matches the first. Builders who only need occasional simple curves may not need the full degree range.

How it compares

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Price $34.99
Pricier than about 73% of the 609 comparable items (median $15.99).

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Specifications

Product
Product typeTubing

Questions about this item

What outer-diameter tubing does the Bitspower BP-CMMK12-MBK mandrel kit support?

The kit is made for rigid tubing with a 12 mm outer diameter.

How do I use the 30, 60, 90, 180 and 360 degree mandrels to bend the tubing without kinking it?

Heat the 12 mm tubing evenly, slide it over the chosen mandrel, and follow the laser-marked radius and 1-degree hash marks while bending; the common mistake is heating only one spot, which causes flat spots.

Will the mandrels wear out or need replacing after repeated bends?

The mandrels are solid metal tools with no consumable surfaces, so they do not wear out and need no scheduled replacement.

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