Spring Bumper

A spring bumper is a small cushioned stop installed inside the horizontal track at the point where the door reaches its fully open position. When the top section of the door has traveled all the way back into the overhead position, the roller on the leading edge contacts the bumper. The bumper absorbs the kinetic energy of the door, stopping it without a hard metal-on-metal impact.

Amarr defines it simply as "a small spring-cushioned bumper attached to horizontal track to stop door at full open position."

Why it matters:

A sectional garage door moving at full speed carries significant momentum, especially on heavier steel or wood doors. Without a bumper, the top section roller would slam into the closed end of the horizontal track at every opening cycle. Over thousands of cycles, that repeated impact would deform the track end, loosen the back-hang fasteners, and wear out the roller stem prematurely.

The spring bumper is inexpensive, typically under five dollars, and is considered a standard part of any residential track kit.

What it looks like:

Most spring bumpers are a small coil spring mounted in a rubber or neoprene sleeve, held in place by a bolt through the track wall. Some manufacturers use a solid rubber cylinder instead of a spring. Either way, the result is the same: a controlled stop with a small amount of give rather than a hard contact.

For example, a 16-foot wide two-car door opening at full speed has two rollers entering the horizontal track simultaneously on each side. Both hit their respective spring bumpers at the same moment, bringing the door to a smooth stop.

The spring bumper's position on the track determines how far back the door rests in the open position. Moving the bumper forward allows more door overhang into the garage. Moving it back allows the door to travel farther, useful when a vehicle parks close to the opening.