Common Garage Door Industry Terms to know in the Field for Dealers and Installers
We want to help you get familiar with some of the numerous industry-specific terms and definitions that you as a dealer/installer will need to know in the field. This glossary of terms will be looking at the most common terms you would use on a daily basis.
Wire Size: The diameter of the wire used to manufacture a spring. To learn more about different wire types check out this resource.
Coil: A full circle of wire around the spring. A spring can be measured by the number of coils it has.
Inside Diameter (ID): The measurement from one inside wall to the opposite inside wall of a spring.
Outside Diameter (OD): The measurement from outside coil to the opposite outside coil.
Length: How long a spring is (typically measured in inches) and covers the overall length of a spring from end coil to end coil.
Torque: The amount of force a spring has when tensioned.
Inch-Pound Per Turn (IPPT): A measurement of torque or power delivered to the shaft for each turn of a spring.
Spring Life Cycle: The life expectancy of a spring in cycles. One cycle is a complete open and close of the door.
PRO TIP: Current regulations call for a minimum of 10,000 cycles for springs. At SSC we ensure all of our spring meets or exceeds this.
Headroom: The space from the top of the door’s frame opening to the ceiling.
Extension Spring: A counterbalance spring that is stretched to create torque and the recoiling of the spring creates the lift.
Hand/Wind: Springs can either be left-wound (clockwise) or right-wound (counter-clockwise) depending on the direction of the coils on the spring.
Torsion Spring’s Standard End (Crimp End): The end coil is bent up slightly to allow the installation of a cone.
Torsion Spring Growth: The amount (in inches) a spring can expand and grow while it is wound.
PRO TIP: This is calculated by (Number of Turns x Wire Diameter)
Cones: The die-cast aluminum cones that get installed into the torsion springs. Two types of cones (winding & stationary).
Duplex Spring: A spring-wound inside another spring; giving the spring and counter-balance assembly additional torque while also maximizing the space needed. Springs can also be wound with 3 and 4 together. These are known as triplex and quadplex springs respectively.
Counterbalance Assembly: The mechanism that allows the composition of torque to move and balance an overhead door. Learn more about counterbalance assembly here.
Winds on Springs: Method for determining the number of turns.
Measure distance (in inches) from the torsion shaft to the floor. Divide by the circumference of the associated drum.
Extension Spring Single-Looped End: When an extension spring’s end has just one single wire coil as the loop.
Extension Spring Double-Looped End: Uses two coils of wire to create the double-looped end. One end holds the spring, the other end fastens to a pulley.
Track Pitch: The angle of the door’s track assembly in the door’s open position. There are 3 different types of track pitch.
- Vertical Lift – raises the door straight up.
- Semi-Vertical – Takes the door up and bends it at a slight angle.
- Follow the Roof Pitch: Moves the door up and follows the pitch of a roof.
Spring Block (Repair): A small square block of steel that allows technicians to temporarily repair a broken torsion spring.
Drums: Cast aluminum pieces that are secured to the torsion shaft and hold the cable in place as it is wound.
Torsion Spring: A counterbalance spring that is wound with torque, using the counter winds to create the lift.
Mini Warehouse Ends: When the standard ends are mechanically bent into another shape. Attaches directly to a manufacturer’s specific assembly.
Track Radius: The amount of space (in inches) that it takes to transition the door from closed to open.
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