Garage Door Extension Springs 48" X 66" for 11' High Doors

These extension springs are engineered for 11-foot-tall overhead garage doors and provide the correct counterbalance for door weights ranging from 100 to 280 pounds. Properly matched springs reduce strain on the door system and help maintain smooth, controlled operation.

Each spring connects to the horizontal track support using S-hooks and is designed for use with a standard cable-and-sheave pulley system and safety cable. As the door closes, the spring extends to absorb load and control descent. When opening, it retracts to assist lifting and maintain tension that helps hold the door securely in the open position.

For correct balance and safe operation, two extension springs are required per door. Springs are sold individually and are DASMA color-coded by weight rating to simplify proper selection.

• Designed specifically for 11 ft high overhead garage doors
• Supports door weights from 100 to 280 lbs
• Required for cable-and-pulley extension spring systems
• Sold individually; two springs required per door
• Color-coded by weight rating for accurate identification
• Manufactured from durable steel for long service life
• Extends during closing and retracts during opening

Selecting the Correct Spring:
Accurate spring selection requires knowing the door’s true weight and height. After safely disconnecting the opener and securing the door, the springs should be removed and the door weighed manually. Match the measured weight to the appropriate DASMA color code.

• 100 lbs – Tan
• 110 lbs – White
• 120 lbs – Green
• 130 lbs – Yellow
• 140 lbs – Blue
• 150 lbs – Red
• 160 lbs – Brown
• 170 lbs – Orange
• 180 lbs – Gold
• 190 lbs – Light Blue
• 200 lbs – Tan
• 210 lbs – White
• 220 lbs – Green
• 230 lbs – Yellow
• 240 lbs – Blue
• 250 lbs – Red
• 260 lbs – Brown
• 270 lbs – Orange
• 280 lbs – Gold

Important Safety Note:
Extension springs are a safety-critical component. Always install springs in pairs and replace both springs at the same time to maintain proper balance and system performance.