- 2 x P528 springs support 105 lbs. to 175 lbs. garage doors
- 4 x P528 springs support 200 lbs. to 350 lbs. garage doors
- Length over coils: 28 in.
- Outside diameter: 1-5/8 in
- Wire gauge: 0.207 in. (no. 5 wire)
- Initial tension: 135 lbs. – 145 lbs.
- Maximum allowable stretch: 22 in.




















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