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.
