All DURA-LIFT® extension springs are manufactured from oil-tempered spring wire meeting ASTM A229 and are designed for a minimum of 10,000 cycles. Finished springs are coated for improved corrosion resistance and handling. Double loop ends are standard on all springs up to 180 pounds. All extension springs come in pairs. Contact us if a different door weight capacity is required. Plug ends are available for extension springs up to a 400 pound weight capacity.
