Garage door pulleys are part of the counterbalance system for extension spring doors. Most doors have four pulleys, or two on each side. There are two stationary pulleys, and a pulley attached to one end of each extension spring. Garage door pulleys are not the same as cable drums, which perform a similar function on garage door torsion spring assemblies.…
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Garage door bottom seals act like a garage door gasket. They keep water, debris and small animals from coming in under the bottom of your garage door. Since there are a variety of different types of bottom seals and retainers, deciding which type to use can be difficult.…
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Commercial Operator Clutches are one of the safety devices that operator manufacturers use to keep their doors from causing injuries or damage. The clutch will slip, which keeps the operator from forcing the door open or shut if something is obstructing it.…
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Limit switches are used to keep the garage door opener from trying to open a garage door that is already open, or trying to close a door that is already closed. Throughout the history of garage doors, engineers have come up with a wide variety of limit switch designs.…
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Amarr created a unique, pinch-proof design for their doors.
The basic principle behind pinch-proof hinges is to prevent people from trying to close the door manually by sticking their fingers between the sections of the door. Smashed fingers have led to numerous lawsuits.…
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Usually, you can find large bi-fold hangar doors at airports or in specialty production shops. We get requests for torsion spring hardware to counterbalance smaller bi-fold doors from time to time.
On bi-fold doors, the top of the door is hinged and secured to the outside top of the opening.…
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In most commercial operators sold in the last century, there were two voltages: the incoming line voltage, and the lower secondary voltage from the transformer. This was usually 24-28 volts with alternating current. On rainy days in my early years, this lower voltage would often produce a noticeable shock.…
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When I first got into the door business, the most common wiring for a 110-volt circuit consisted of a four-wire motor and two power leads. The two power leads ran straight to the motor. The other wires from the motor could go to either power lead.…
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In order to test the cycle life of different spring systems, we designed a Counter and Timer Modification for LiftMaster Operators. This modification allows the operator to close immediately after opening and to open immediately after closing. As a result, we can run the operator nonstop for days at a time so that a 10,000 cycle test can be completed in just a few days.…
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Garage door opener limit switches electrically limit the door travel as it opens and closes. These switches “tell” the opener or operator when to stop. In this video, we explain how LiftMaster limit switches work, and how to adjust them.
LiftMaster uses a common system of nuts on a shaft to limit the movement of garage doors.…
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Huge inventory of torsion springs for same or next day shipping! Here you will find all you need in the most common sizes of 1 3/4," 2," 2 1/4," and 2 5/8" inside diameter springs. Larger 3 3/4" and 6" inside diameter commercial and industrial springs may require a day or two to ship. You'll also find TorqueMaster Springs, Extension Springs, Self-Storage door springs, steel rolling door springs and springs for one piece single panel doors.
Shelves packed with every part you need to fix your doors.
Please note. Shipping times and costs have changed. Normal transit times are currently not guaranteed, even on next day and second day shipments. Shipping prices on items over eight feet have more than tripled.
