P328 ONE PIECE DOOR SPRINGS – PLUG-END EXTENSION SPRING

Description

Built for strength and performance, the P328 28” Plug-End Extension Spring is the ideal replacement for Holmes springs on heavy 1-piece or tilt-up garage doors. With a powerful tension range and rugged wire gauge, this spring is engineered to handle larger, heavier doors with confidence.

Perfect for homeowners or pros tackling a garage door that weighs between 125–250 lbs, the P328 delivers reliable lifting support and smooth operation every time.

 Why Choose the P328 Spring?

• Handles 125–250 lb. garage doors with just two springs

• Ideal for canopy-style and tilt-up door systems

• Durable construction for long-term performance

Specifications

• Length over coils: 28 inches

• Outside diameter: 2 inches

• Wire gauge: 0.244 in. (No. 3 wire)

• Initial tension: 165–185 lbs

• Maximum stretch: 18.5 inches

• Requires C-hook (sold separately) for installation

 

💡 Installation Tip: Always replace both springs at the same time to maintain balanced tension and avoid premature wear.