Heavy Duty Roll Up Overhead Garage Door Torsion Spring
Material:High carbon steel ,72B, 82B, 65Mn
Wire diameter: 5 mm /5.5mm /5mm /6.5mm /7mm /7.5 mm
Inside diameter: 50.8mm -152mm
Outer diameter: 325mm – 3500 mm
Surface: Plating nickel/ zinc/ black/ gold/ silver/ brass/ chrome, electrophoresis coating plastic, oiled to prevent rust, etc
Usage: Rolling door / garage door / industrial /Furniture
Engineered for maximum application range.
Minimum 10,000 cycles, at +/- 7.5lbs of target door weight.
Springs are made of steel coils with aluminum cones.
Black oil tempered, galvanized and powder coated wire provides a clean durable surface finish.