P528 ONE PIECE DOOR SPRINGS – PLUG-END EXTENSION SPRING

Description

Tough jobs need tougher springs. The P528 28” Plug-End Extension Spring is a reliable, high-tension solution designed for heavier 1-piece, tilt-up, or canopy-style garage doors. Built to replace Holmes-brand springs, it’s ideal for doors that need extra lifting power and long-lasting durability.

Whether you’re working on a home upgrade or a professional repair, this spring has the strength and specs to get the job done right.

 Perfect Fit for Heavier Garage Doors

• Use 2 P528 springs for doors weighing 105–175 lbs

• Use 4 P528 springs for doors weighing 200–350 lbs

• Engineered for smooth lift and balanced tension

 Specs & Features

• Total coil length: 28 inches

• Outer diameter: 1-5/8 inches

• Wire gauge: 0.207” (No. 5 wire)

• Initial tension: 135–145 lbs

• Max stretch: 22 inches

• Compatible with C-hooks or W-hooks (sold separately)

• Backed by a 1-year manufacturer warranty

 

💡 Installation Tip: For safe and efficient performance, always replace extension springs in sets and verify proper tension before operating the door.