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Available in unalloyed steel and stainless steel. Minimum order value of £15+VAT. Shipping to the UK only.
Extension Springs with Loops
General purpose extension springs.
TC = No of active coils
R = Spring Rate
F0 = Initial force in Newtons
F1 = Maximum Force
Max load length and temperature:
Unalloyed spring steel
Maximum load length EL applies for static or pseudo static loaded springs operating at temperature up to about 40°C. The relaxation, i.e. the power loss over time, will then stay within acceptable values for most applications. At higher operating temperatures or dynamic life demands, more than 10,000 cycles, the spring should not be loaded as far as EL. Maximum permitted operating temperature of unalloyed spring steel EN10270-1-SH is about 120 °C.
Stainless spring steel:
Maxnimum load length EL applies for static or pseudo static loaded springs operating at temperature up to about 150°C. Maximum permitted operating temperature of stainless spring steel EN10270-3-1.4310 is about 250 °C.
Length of loop is minimum 0.75 * ID
To calculate the spring force at a certain length, the travel in mm is multiplied by the rate (R) + the initial force (F0).
1 kp = 9.80665 Newtons, 1 Newton = 0.10197 kp