Extension Springs

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Allows manual and electric garage doors to lift easily.

We offer springs to accommodate any garage door size and weight. Our simple color coding system helps customers identify the appropriate extension springs for their garage door. Provides the strength and lifting power that your garage door needs.
Diameter: 3.18 mm* 3.97 mm* 4.37 mm* 4.76 mm* Door Size: 16 ft x 7 ft 8 ft x 7 ft / 9 ft x 7 ft 8 ft x 7 ft / 9 ft x 7 ft / 16 ft x 7 ft Width: 30.2 mm* 35.7 mm* 38.1 mm* 41.3 mm* 43.7 mm* Color/Finish: Black / Blue Black / Blue Black / Brown Black / Brown Black / Light Blue Black / Light Blue Black / Red Black / Red Black / White Black / White Black / Yellow Black / Yellow Weight Capacity: Max. 40.8 kg* Max. 49.9 kg* Max. 59 kg* Max. 63.5 kg* Max. 68 kg* Max. 72.6 kg* Select Options
Product # Diameter Door Size Width Color/Finish Weight Capacity
7740BLBC 3.18 mm* 8 ft x 7 ft / 9 ft x 7 ft 30.2 mm* Black / Light Blue Max. 40.8 kg*
7743BLBC 3.97 mm* 16 ft x 7 ft 38.1 mm* Black / Blue Max. 63.5 kg*
7742BLBC 3.97 mm* 8 ft x 7 ft / 9 ft x 7 ft / 16 ft x 7 ft 35.7 mm* Black / Yellow Max. 59 kg*
7741BLBC 3.97 mm* 8 ft x 7 ft / 9 ft x 7 ft / 16 ft x 7 ft 38.1 mm* Black / White Max. 49.9 kg*
7744BLBC 4.37 mm* 16 ft x 7 ft 41.3 mm* Black / Red Max. 68 kg*
7745BLBC 4.76 mm* 16 ft x 7 ft 43.7 mm* Black / Brown Max. 72.6 kg*

ADVANTAGES AND BENEFITS

Allows manual and electric garage doors to lift easily.

TECHNICAL SPECIFICATIONS

Length
63.5 cm*
Material
Steel
Disclaimer

Measures shown with an asterisk (*) have been converted as per your preference. These are not the official measures. To view the measures specified by the manufacturer, click here.

IMPORTANT INFORMATION

Springs should always be replaced in pairs.
Always replace springs with the same class (color) of spring.
Always install safety cable with springs.

INCLUDED PRODUCT(S)

2 extension springs
2 safety cables

RELATED DOCUMENTS

DISCLAIMER

Warning: Improper installation or door position can result in serious injury or death.
- Be sure to read and fully understand all instructions before starting any work.
- Wear eye protection.
- Disconnect power door opener from door before any other step.
- Do not remove more than one part at a time.
- Do not raise or lower without all components installed and tightly secured.
- This hardware is only intended for residential garage doors.
- All hardware - especially extension and torsion springs - under extreme tension at all times.
- All tension must be released from springs before performing any work.
- If you are unsure if the replacement part matches the part to be replaced or if you do not understand the installation instructions, contact a professional installer.