Garage Door Hardware: Springs, Cables, Rollers, Hinges and Tracks

The counterbalance system

This is the high-tension heart of the door and the reason spring work is never a DIY project.

• Torsion springs — mounted on a shaft above the opening; sized by wire size, inside diameter and length
• Extension springs — run alongside the horizontal tracks on older doors; require containment cables
• Lift cables — steel cables that transfer spring force to the bottom brackets
• Cable drums — grooved drums that spool the cables evenly; must be matched to door height
• Center bearing plate and end bearings — quiet the shaft and carry its load
• Bottom brackets — under permanent tension; never unbolt them with the door under load

Guidance and motion parts

These are the parts that make a door quiet or noisy.

• Rollers — 10-ball nylon rollers with sealed bearings are the quiet upgrade; steel rollers grind as they wear
• Hinges — numbered by position; cracked hinge barrels signal an out-of-balance door
• Vertical, curved and horizontal track — 2-inch residential, 3-inch commercial
• Struts — horizontal bracing that keeps wide sections flat
• Jamb brackets and track hangers — loosen over time and cause rattles

Opener components

Openers fail in predictable places: the plastic drive gear, the trolley or belt, the logic board after a power surge, the capacitor, and the safety photo eyes. Because the springs carry the weight, most premature opener failures are really spring failures in disguise.

Realistic lifespans

Cycle count drives everything. An average household door runs 1,200 to 1,500 cycles a year.

• Torsion springs: 10,000 cycles standard (about 7 to 10 years), 20,000 to 50,000 high-cycle
• Cables: 7 to 12 years, sooner if they fray at the bottom bracket
• Nylon rollers: 10 to 15 years; steel rollers 5 to 10
• Hinges and brackets: 15+ years on a balanced door
• Bottom weather seal: 3 to 6 years in Georgia sun
• Opener: 10 to 15 years

Frequently Asked Questions

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