P928 28 in. Plug-End Extension Spring is a Holmes spring replacement for heavier 1-piece / tilt-up / canopy-style garage doors. Two P928 springs - one on each side of the door - can handle up to a 75 lbs. door, with an initial tension of 45 lbs. to 55 lbs. A c-hook (sold separately) is required to connect spring to jamb hardware.
- 2 x P928 springs supports up to a 75 lbs. garage door
- Length over coils: 28 in.
- Outside diameter: 1-1/4 in.
- Wire gauge: 0.148 in. (no. 9 wire)
- Initial tension: 45 lbs. - 55 lbs.
- Maximum allowable stretch: 18.5 in.