Covered Spring Channel Counterbalance

By Huu Khanh Nguyen · Updated October 28, 2026 · sectional-door, counterbalance, tension-spring, spring-channel, teckentrup, normstahl

Tension springs enclosed in a channel along each horizontal track of a sectional door, with double holding cables.

Parameters

Name	Default	Unit
Door width	2438	mm
Door height	2133.6	mm
Shaft or track height above the door top	330	mm
Shaft position	front
Backroom beyond the door height	457	mm
Track depth behind the door plane	Math.min(doorHeight + backroom, 3813)	mm
Springs per channel	2
Chunks per spring	Math.ceil(((trackDepth - 83) / 3 - 1) / 500)
Spring windings	springChunks * Math.round(((trackDepth - 83) / 3 - 1) / springChunks)
Depth	trackDepth	mm
Height	doorHeight + shaftOffset	mm