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Would Prefer Torsion....

Posted by Dodgeman on August 8th, 2002 12:17 PM
In reply to torsion spring vs. extension spring by Tom on August 8th, 2002 11:44 AM [Go to top of thread]

The spring size and strength for either type spring is designed for the application. Torsion springs usually are somewhat more expensive, but take less room, and when they do fail, do not fail explosively as extension springs do. Torsion springs can be somewhat dangerous to apply the tension, but some newer model doors now have a worm drive to tighten the spring which is much safer. (of course costs more too)
The life of a torsion spring has a B10 rating of about 5,000 cycles for residential applications and about 15,000 cycles for industrial applications. (The B10 rating is the number of cycles in which 10% of the springs of a given type are expected to fail.)
Do not attempt to reuse the springs you have now. They are probably near the end of their useful life and wouldn't take the load of the heavier steel door.
Good Luck!

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