The best pipe bending machines, compared.
Top pick: WINMAX manual tube bender, 1 in to 3 in Best value: KATSU 12 ton hydraulic pipe bender, 6 dies – About £119.99 for that stated die set. The other listings are not marked best value: one does not name the inch system, and one states no diameter. Updated 23 October 2026.
A pipe bending machine is a ram-and-die frame, a fixed former, or a roller used to curve tube. You buy one in the UK when a steel run needs a set radius and a hand lever or a spring is the wrong tool. The check that stays useful is the die against the pipe you have measured. Nominal bore is not outside diameter. Half-inch nominal bore is about 21.3 mm outside, 1 inch about 33.7 mm, and 2 inch about 60.3 mm. An inch mark with no BSP or nominal-bore note may mean outside diameter. Match the wall as well. A die sold for medium and heavy steel is the wrong shoe for thin-wall copper, and hard copper is generally left straight. A ram or a fixed former gives one radius per die. A roll makes sweeps and rings, not a tight elbow. Gas installation pipework is for a Gas Safe engineer. If staff use the machine, it is work equipment. The order of those checks is in the [pipe bending machine buying guide](/hub/diy-supplies/pipe-bending-machine/sub/pipe-bending-machine-buying-guide).
A pipe bending machine is a ram-and-die frame, a fixed former, or a roller used to curve tube. You buy one in the UK when a steel run needs a set radius and a hand lever or a spring is the wrong tool.
11 products checked · 62 hrs invested · +21,400 readers
Swipe for more
1-2 of 3
Personal buying guide
Question 1 of 2
What can you measure before you order?
The WINMAX is a hand-powered mounted tube bender at £199.96, with seven interchangeable dies of which six are described as circular from 1 inch to 3 inch. The listing does not say whether those inches are nominal bore or outside diameter, it does not describe the seventh die, and it states no wall thickness. A bullet also names round or square bars up to 5/8 inch thick and 1-15/16 inch wide, which is a bar claim rather than a pipe-wall chart. It weighs 17.1 kg and the technical table says the power source is hand powered, so this is not a hydraulic ram. The amazon.co.uk line is 5.0 from two reviews, and both were written in the United States. Those reviews call it heavy and sturdy, with clean bends and modest effort, and one says a lightly fixed bench may not suit it. The same review limits copper to careful sand-filled work to reduce crinkling, which is a reviewer’s method and not a specification on the page.
Pros
Cons
Best for: You already know the outside diameter in inches and you can bolt the frame to a bench that will not shift.
Less suitable: You need BSP nominal-bore steel formers, a stated wall for copper, or a UK review sample.
Specifications
Common questions
Are the WINMAX dies nominal bore or outside diameter?
The listing says six circular dies from 1 in to 3 in, and seven dies in total. It does not say whether those inches are nominal bore or outside diameter. The seventh die is not described.
Is this bender hydraulic?
The technical table says the power source is hand powered. It is a manual mounted tube bender, not a hydraulic ram.
What do the two reviews say?
Both are from the United States. They call it heavy and sturdy, with clean bends. One says the bench needs to be fixed to a wall, and mentions sand-filled copper as a careful method. That sand fill is not a listing specification. The rating line is 5.0 from 2 reviews.
The KATSU 12 ton manual hydraulic bender is a ram-and-die frame for BSP steel tube, with six dies from 1/2 inch to 2 inch and a stated wall of 2.75 mm to 4.5 mm. At £119.99 and 29.8 kg it is the only machine in this set that names BSP and writes that thin-wall tubing such as copper piping is not suitable. Across 20 amazon.co.uk ratings the line is 3.5, and the stored listing holds nine review texts rather than all twenty. A UK review says it works and is simple to use, and an Italian review says it straightened a bent 1 inch aluminium tube. Other reviews describe a weld drip that cut the buyer while the machine was lifted from the box, dies that did not match the stated diameter, and a frame that arrived bent so accurate bends were not possible. An Italian note says tube around 2 mm wall deforms and that three close bends on one piece are not practical, and a Spanish review says electrical metal conduit flattens. No bend angle is printed, and a ram fixing screw came off in one Italian review when the piece was not centred, so you centre the pipe before you pump. It is the top pick and the best value here, on a score of 64.
Pros
Cons
Best for: You bend BSP steel tube a few times a month, you can measure outside diameter and wall, and you will reject a frame that arrives bent.
Less suitable: You need 15 mm or 22 mm copper, thin conduit, a stated angle, or a one-off bend you could hire.
Specifications
Common questions
Will this KATSU bender bend copper pipe?
The listing says it is not suitable for thin-wall tubing such as copper piping. The stated wall band is 2.75 mm to 4.5 mm, and the buyer is told to check the outside diameter.
Which dies are in the box?
Six interchangeable BSP dies: 1/2 in, 3/4 in, 1 in, 1-1/4 in, 1-1/2 in and 2 in. A maximum bend angle is not stated.
What do the reviews complain about?
UK reviews on the listing mention a cut from weld spatter, dies that did not match the stated diameter, and a frame that arrived bent. Another UK review says it works and is simple. The listing shows 3.5 from 20 ratings. Nine review texts are stored, not all twenty.
The DRAUXI TR40 is listed at £345.79 with a title that calls it a manual rolling machine for metal pipes, flat iron and square steel. A machine-type bullet says pipe and tube bending, a material bullet says sheet or plate rolling, and an extra-services bullet says swaging. The listing does not state an outside diameter, a wall, a die or a bend radius, so you cannot specify a handrail or an elbow from this page. The colour field reads 1-12mma and the size field reads One Size, and neither is a pipe specification. An automation bullet says manual, while the technical table says the power source is AC, and both lines are printed. It weighs 16 kg, the dimensions are 50 x 30 x 30 cm, and the contents line is package quantity 1, with dies, rollers and a handle not confirmed. The metal-processed bullet says stainless steel, which names a metal rather than a thickness, and the listing has no review text and no star line. The score of 2 is that missing diameter and the conflicting drive, not a roller that was measured and failed.
Pros
Cons
Best for: You will only consider it after the seller confirms diameter, drive, and whether the box rolls pipe, flat iron or plate.
Less suitable: You need a stated BSP die, a tight elbow, a UK review, or a single drive with no conflicting power line.
Specifications
Common questions
What pipe size will the DRAUXI TR40 bend?
The listing does not state an outside diameter, a wall or a bend radius. The colour field reads 1-12mma, and the size field reads One Size. Neither is a pipe specification.
Is it manual or mains powered?
The automation bullet says manual. The technical table says the power source is AC. Both lines are on the listing, and they conflict.
Are there customer reviews?
The listing has no review text and no star line, so there is no amazon.co.uk rating.
Shelf prices, stars and review notes are the amazon.co.uk snapshot stored for these three listings on 21 October 2026. This comparison did not lab-test tonnage, bend angle, ovality or wall. Review points run to 40, specification points to 35 and the value band to 15, then listed faults are taken off. The stored scores are 64, 18 and 2. A 5.0 from two United States reviews does not outrank a 3.5 from 20 ratings.
Review evidence
40%Review points are (stars / 5) times 40, times the share of a 20-rating sample, and halved when every stored review is from outside the UK. No star line scores 0. The ram uses 3.5 from 20 ratings with UK text, so the overseas cut does not apply.
Stated specification
35%Specification points run to 35: 10 if the die system is named as BSP, nominal bore or outside diameter, 8 for a printed size range, 8 for a wall band or an explicit thin-wall exclusion, 5 for a drive with no conflicting power line, and 4 for a printed bend angle or radius.
Value band
15%Value is one band, up to 15. A stated die set at £150 or under scores 12. A printed size range between £150 and £250, with the die system not named, scores 6. No diameter and a price above £300 scores 2.
Listed faults
10%Faults are taken off, not added. The ram loses 7 for a frame bent on arrival, dies that did not match the stated diameter, and a weld-spatter cut, taken as one group. The bench former loses 3 because a seventh die is claimed and not described. The roll has no further deduction: the manual-versus-AC conflict already scores 0 for drive.
You are choosing a ram, a fixed former or a roll for steel tube, not a lever for 15 mm copper. The three amazon.co.uk listings stored on 21 October 2026 are not the same machine. The KATSU ram is about £119.99, score 64, and it is both the top pick and the best value because it is the only stated BSP die set under £150. WINMAX is about £199.96 and scores 18: inches without a bore system, and a 5.0 from two United States reviews.
A pipe bending machine in this category is a ram-and-die frame, a fixed former, or a roller. It is bought for steel tube. It is not the tool for 15 mm and 22 mm copper, and lever benders and springs are a different category. You match the die to the outside diameter and the wall you have measured. A slogan such as 12 ton does not replace that chart. None of the three amazon.co.uk listings stored on 21 October 2026 prints a UKCA mark or a declaration of conformity.
Half-inch nominal bore is about 21.3 mm outside, not 12.7 mm. A 1 inch die with no BSP mark may be 25.4 mm outside, not 33.7 mm. The bench former in this set does not say which system it uses.
The ram excludes thin-wall tubing such as copper piping and prints 2.75 mm to 4.5 mm. Medium 15 mm and 20 mm steel at about 2.6 mm sits under that floor. Thin conduit can flatten. Do not straighten and re-bend work-hardened copper.
Gas installation pipework is for a Gas Safe engineer. A roll that states no outside diameter cannot be specified for a handrail or an elbow from the listing. If the frame arrives bent, or the dies do not match the stated size, stop rather than forcing the bend.
Material and wall come before tonnage. BSP ram dies suit BS EN 10255 medium and heavy steel. Copper to BS EN 1057 needs a former made for that outside diameter: R220 annealed or R250 half-hard. R290 hard tube is generally not bent. A listing that excludes thin-wall tubing such as copper piping, and prints 2.75 mm to 4.5 mm, is describing a shoe for thicker steel. Palmer's datasheet puts 1/2 inch medium wall at about 2.65 mm, under that floor, and 2 inch heavy at about 4.50 mm, on the limit.
A ram or a fixed former gives one radius per die. A roll makes sweeps and rings, not a tight elbow. Yorkshire Copper puts a machine-bent half-hard copper near three times the outside diameter at the root, and a spring near five times. BS 5431 does not cover springs above 22 mm. Read complaints as well as stars. A 5.0 from two reviews written in the United States is not a UK sample, and a missing star line is not a pass. A drive line has to be one thing.
Three typical situations, each with a recommendation from this comparison.
You bend medium or heavy steel a few times a month and you can measure outside diameter and wall. The KATSU ram is the top pick and the best value at about £119.99, score 64, with six BSP dies and a stated wall of 2.75 mm to 4.5 mm. Reject a frame that arrives bent. It is not a 15 mm copper tool.
You already know the outside diameter in inches and you can bolt the frame to a bench that will not shift. The WINMAX former is about £199.96, score 18, with six circular dies listed from 1 inch to 3 inch. The listing does not say whether those inches are nominal bore. The 5.0 is two United States reviews. It is not the best value.
You want sweeps rather than a tight elbow, and you will not order until diameter and drive are confirmed. The DRAUXI roll is about £345.79, score 2, with no stated pipe diameter and a manual bullet that conflicts with AC. That score is the missing specification, not a roller that was measured and failed.
The top pick and the best value are the same listing: the KATSU 12 ton manual hydraulic bender at about £119.99, score 64. It is the only card with BSP dies, a wall band of 2.75 mm to 4.5 mm, a written copper exclusion and a UK sample of 3.5 from 20 ratings. The 12 ton figure is a seller claim, and UK reviews include a frame that arrived bent, dies that did not match and a cut from weld spatter. WINMAX at about £199.96 scores 18: the inches are not named as nominal bore or outside diameter, and the 5.0 is two United States reviews. DRAUXI at about £345.79 scores 2 because the listing states no diameter and the drive lines conflict, not because a roller was measured and failed. The awards rank only these three stored listings.
KATSU 12 ton hydraulic pipe bender, 6 dies
About £119.99 for that stated die set. The other listings are not marked best value: one does not name the inch system, and one states no diameter.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 21 October 2026. Updated 23 October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the amazon.co.uk figures already stored for this set. This is not a laboratory test of tonnage, bend angle, ovality or wall.
