Square to Round Duct Former

Features of the STR-750 Square to Round Duct Former

Clinching machine

The STR-750, Square to Round Duct Former from Firmac has revolutionized square to round duct forming. Duct fittings can be made quickly and easily, ensuring production in other areas is not halted or slowed down and your main folding machine is free for other work. This compact and versatile machine will form a duct fitting in less than two minutes from one piece of metal, with only one join. No reshaping is required.

  • Square to round duct fittings can be formed in less than two minutes (some pieces can be formed in 45 seconds)

  • Duct fittings can also be made in one complete piece with only one join to make, helping reduce production time and also maintaining its shape

  • Compact and mobile. Ideal for use on site

  • Quick and easy to use with pneumatic foot operation keeping both hands free to move material quickly through the machine

  • Offsetting patterns just as easy to make

  • Forms flat oval shapes if required


Gauge 30”
Machine Dimensions 1050mm W x 620mm D x 1100mm H
Compact Size Folds neatly away when not in use
Weight 80Kg
Air Requirement 6 to 7 bar clean and dry
Pattern The maximum creasing length of the square
to round pattern is 750mm.
Capable of making offset pieces as well as
symmetrical square to round.
Diameter Minimum diameter is 100mm
Operation Pneumatic foot operation

Sample of Round and Square Duct

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100% Made in the U.S.A