Sectional garage doors with side springs use extension springs which means they stretch when weight is applied by the cable and they have pitched loops one end of the spring to assist attaching the cable wheel. One end is typically attached to a fixed point and the loop on the other end is attached to the doors cable wheel. Standard sectional garage door side spring size ranges we keep in stock: Wire Size range: 2.80 – 5.0 mm Outside Diameter: 27mm – 47mm Body Length: 690mm Part numbers: 110533 – 20Kg-H188, 110534 – 40Kg-H189, 110535 – 55Kg-H190, 110536 – 70Kg-H191
