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Extension spring SR series

extension spring
extension spring
extension spring
extension spring
extension spring
extension spring
extension spring
extension spring
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extension, constant-traction
for reels
Extended length

Min.: 70 mm (2.8 in)

Max.: 305 mm (12 in)

Outer diameter

Min.: 4.3 mm (0.2 in)

Max.: 25.5 mm (1 in)


Min.: 1 N

Max.: 22 N


SPIROFLEX constant force extension springs provide a huge range of application opportunities. Springs can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements. Spring width: 1.8 to 100 mm Spring thickness: 0.05 to 1.0 mm Material: Textured carbon and stainless steel Service life: Up to 50,000 load cycles (typical applications require 5,000 – 20,000 cycles) Minimum hysteresis Typical applications of SPIROFLEX constant force springs for tension and compression forces include: Window balance systems Spring balance systems Point of purchase / Retail displays Counterbalances Car door pillar adjusters Shutter doors return Cable roll springs / Cable joint springs Industrial washers / Dryers Vending machines


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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.