Garage door extension springs

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Old 07-26-16, 04:41 PM
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Garage door extension springs

I'm trying to find 2 replacement springs for a 7 ft Raynor door. The springs are 23 inch 70 lb rated. Fully extended they are 84". I can't find anything that is rated over 67" fully extended. All I can find is 25" springs. How do I know if they are safe to 84"? Would I buy 25"x42" springs?
 
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Old 07-26-16, 05:16 PM
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There is a garage door parts place in Braintree MA. Standard Door Supply of Boston, 34 Garden Park Braintree MA. Really helpful and very good prices. I have bought springs, rollers, etc from them. Give them a call.....I have my latest invoice but their phone number is not on it.
 
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Old 07-26-16, 05:45 PM
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Thanks. I'll give it a try.
 
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Old 07-27-16, 06:35 AM
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Extension springs are rated by door height and weight. The pulley attached to the spring travels one half the door height from fully open to fully closed on a standard pulley installation. Assuming no slack in the cable, the most your spring should expand is 7 feet divided by 2. Not sure where the 84 inch expansion comes from.
 
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