Calculate Inch-Pounds Per Turn (IPPT), cable drum radius, spring turns, inside diameter, and wire gauge for residential overhead garage door counterbalances.
Counterbalance torque matches door deadweight at every vertical inch of travel.
Required Torsion Spring IPPT
Full Wind Turn Specification
7.9 Full Quarter-Turns (DASMA 102)
| Item / Material Spec | Quantity | Unit / Package | Installation Notes |
|---|---|---|---|
| High-Cycle Torsion Spring (480.0 IPPT) | 2 | Springs | Rated for 25,000+ opening/closing cycles |
| Standard 4-in Cable Drums (Left & Right) | 1 | Pair | Die-cast aluminum with 1/8-in aircraft cable |
| Solid Steel Winding Bars (1/2-in Hex) | 1 | Pair | MANDATORY safety tool for winding spring tension |
Cost of raw lumber, concrete, shingles, wire, or stone without equipment rentals or labor.
Full installation: permits, site prep, skilled trade labor, equipment, and structural warranty.
Average trade labor savings if executed as a skilled DIY homeowner project.
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Standard commercial specifications and pre-calculated project benchmarks.
| Door Weight | Door Height | Total System IPPT | Individual Spring Spec (Dual) | Turnkey Pro Spring Replacement |
|---|---|---|---|---|
| 130 lbs | 7 ft | 69.3 IPPT | .207 × 1.75" × 26" (34.6 IPPT) | $250 – $380 |
| 180 lbs | 7 ft | 96.0 IPPT | .225 × 2.00" × 28" (48.0 IPPT) | $300 – $450 |
| 240 lbs | 7 ft | 128.0 IPPT | .243 × 2.00" × 32" (64.0 IPPT) | $350 – $550 |
| 320 lbs | 8 ft | 152.0 IPPT | .262 × 2.00" × 34" (76.0 IPPT) | $450 – $680 |
CAUTION: Garage door torsion springs are under extreme mechanical tension capable of causing severe injury or death. Only wind springs using solid cold-rolled steel winding bars of the exact 1/2" diameter. Never use screwdrivers or punch pins.
IPPT stands for Inch-Pounds Per Turn. It is the fundamental engineering unit measuring how much rotational torque a torsion spring generates for each 360-degree rotation of wind.
A standard 7-foot garage door on 4-inch drums requires approximately 7.5 to 8 full turns (30 to 32 quarter-turns with winding bars).
Both springs experience the exact same number of opening and closing cycles. When one spring breaks from metal fatigue, the companion spring is within weeks of failing as well.
10,000 cycle springs last 7 to 10 years at 3–4 daily uses. High-cycle (25,000 to 50,000 cycle) springs use thicker wire over a longer spring coil, lasting 20+ years for a modest $40 price premium.