These pulleys are constructed from heavy duty steel.
* 3/8" bore size is the diameter of bolt it will accommodate
* Width of the pulley at the bore is ¾"
* Accepts cables as large as 1/4'" diameter
Garage doors have either torsion springs or extension springs to help lift the door. Extension springs, or stretch springs, stretch in length when the door closes. A pulley with a clevis is attached to the spring. The cable goes around this pulley, see photos above. If you have this type of spring, one of the most common garage door hardware problems is worn out pulleys. There are four pulleys on a garage door extension spring set-up. Two are bolted in a stationary position at the front wall above either side of the curved track. Two more pulleys with yokes/forks/clevis are attached to the extension spring(s) above each horizontal track.
If your pulleys wobble they should be replaced before they totally wear out and bind up the door.
If one pulley is going bad the others will most likely wear out soon also.
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