CK67 AISI1065 C70S C70 blue garage door spring coils

The springs use for counter balancing rolling shutter can be make from spring steel wire or flat spring steel strip. Flat spring steel strips are widely used in rolling shutter industies, due to its durability and 3000 cycles rolling up and down per year. It is usually cut into 3m, 3.5m, 5m, 5.5m, 6m from flat spring big coils. Flat spring steel trip used for garage door spring, the material shall be 0.65-0.75 percent carbon steel strip with hardened and tempered process. Blue tempered in flat spring steel strip, can be anti-corrossion for a long time without getting rust.

 

 

We have been in door spring steel strip lines for many year and we can supply this material with professinal quality and competitive price with the following dimensions:

 

Material: ck67, c67, cs70, c70, sae1070

1.00 mm X 40 / 45 / 50 / 55 /  60 / 70 / 80 mm

1.20 mm X 40 / 45 / 50 / 55 /  60 / 70 / 80 mm

1.30 mm X  40 / 45 / 50 / 55 /  60 / 70 / 80 mm

1.40 mm X  40 / 45 / 50 / 55 /  60 / 70 / 80 mm

1.50 mm X  40 / 45 / 50 / 55 /  60 / 70 / 80 mm

1.60 mm X  40 / 45 / 50 / 55 /  60 / 70 / 80 mm

45-49HRC, blue color, smooth round edges