The 28 in. Plug-End Extension Spring Pair – 0.177 in. No. 7 Wire is designed for residential garage door systems that use plug-end extension springs. This spring pair helps restore proper balance, smoother door movement, and reliable lifting support when old springs become worn, stretched, or damaged.
Each P728 spring is built with 0.177 in. No. 7 wire and has a 1-5/16 in. outside diameter. When installed as a pair, these springs are designed to support garage doors weighing approximately 90 lbs to 150 lbs. For heavier garage doors, the source product notes that 4 P728 springs can support 150 lbs to 300 lbs.
Replacing both extension springs at the same time is recommended to keep the garage door properly balanced and to reduce uneven wear on the opener, rollers, cables, pulleys, and track system.
Product Features
- Size: 28 in. length over coils
- Wire Size: 0.177 in. No. 7 wire
- Outside Diameter: 1-5/16 in.
- Spring Type: Plug-end garage door extension spring
- Quantity: Pair of 2 springs
- Door Weight Support: Approximately 90–150 lbs when using 2 springs
- Heavier Door Support: 150–300 lbs when using 4 springs
- Initial Tension: 110–120 lbs
- Maximum Allowable Stretch: 18.5 in.
- Product Code: P728
- Product Weight: 4.4 lbs
Best For
This extension spring pair is ideal for replacing damaged or weakened plug-end garage door extension springs on residential doors that match the required spring length, wire size, outside diameter, stretch, and door weight range.
Installation Note
Garage door extension springs are under high tension and can be dangerous if installed incorrectly. Always confirm your existing spring measurements and door weight before ordering. Professional installation is recommended for safe and proper performance.
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