Outer Diameter: 200/220/240 mm

Inner Diameter: 32/45/50/60 mm

Height: 70/80/93 mm

Thickness: 1.0 or 1.2 mm

Spring box material: Zinc Coated, not easy to break, long lasting

Ball bearing material: iron ball, nylon, bearing

Ball bearing: Low rolling resistance, Not easily attrited, smooth and flexible

Surface: smooth grinding

Application: Shops, Warehouses, Garages, Shopping malls etc.

Material: c67s, c70s,c75s,c80s,c75cr1

Thickness of strip: 1.2mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm

Width: 40mm,45mm,50mm,55mm,60mm,70mm,80mm

Hardness: 45-48hrc

Surface: grey blue

Edge: rounded

Tensile strength: 1450-1470mpa

Material: c67s, c70s,c75s,c80s,c75cr1

Thickness of strip: 1.2mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm

Width: 40mm,45mm,50mm,55mm,60mm,70mm,80mm

Hardness: 45-48hrc

Surface: grey blue

Edge: rounded

Tensile strength: 1450-1470mpa

Material: c67s, c70s,c75s,c80s,c75cr1

Thickness of strip: 1.2mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm

Width: 40mm,45mm,50mm,55mm,60mm,70mm,80mm

Hardness: 45-48hrc

Surface: grey blue

Edge: rounded

Tensile strength: 1450-1470mpa

It is for rolling shutter doors spring.

Spring steel strip for rolling doors spring advance on his longer lifttime and durable and flexible through hardened and tempered process to achieve certain hardness and toughness

Normally hardness in 45-47hrc.

Size of thick : 0.8mm,1.0mm,1.2mm,1,25mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm

Width: 30mm,40mm,45mm,50mm,55mm,60mm,70mm,80mm

Material: c67s, c70s,c75s,c80s,c75cr1

Thickness of strip: 1.2mm,1.3mm,1.4mm,1.5mm,1.6mm,1.8mm

Width: 40mm,45mm,50mm,55mm,60mm,70mm,80mm

Hardness: 45-48hrc

Surface: grey blue

Edge: rounded

Tensile strength: 1450-1470mpa