Pattern Blue Spring
Pattern Haskins/Starfleet Blue Spring
A replacement spring to suit Haskins/Starfleet garage doors 3048mm (10` 0") wide to 4267mm (14` 0") wide.
The spring has 71 coils. with a length over coils of 464mm (181/4").
An overall length of approximately 540mm (211/4") including hooks and an outside diameter of 54mm (2 1/8").
Springs are sold individually. although best working practice suggests that they should be replaced in pairs to ensure a properly balanced door.