For pullback, return, tensioning and force retention. Initial tension, working extension and local hook stress are the main design concerns.
For pullback, return, tensioning and force retention. Initial tension, working extension and local hook stress are the main design concerns.
Use these values for early selection. Final dimensions, tolerances and loads are confirmed by engineering review and approved samples.
Precision extension springs with various loop types, suitable for appliances and toys
Fixtures, rods, guards and position-return mechanisms.
Fitness equipment, doors, toys and household products.
Latches, drive tensioners and compact linkages.
Hooks usually create higher stress concentration than the spring body. Avoid side pull and align cyclic load with the spring axis where possible.
Specify initial tension or the first load point when assembly feel matters. Visually closed coils do not completely define performance.
Design BasicsHook form, transition radius, load direction and initial tension determine extension spring reliability and assembly behavior.
Design BasicsA low spring index makes forming and inside-coil stress more demanding, while a high index increases instability and handling risk.
Design BasicsTwo load points constrain both working force and rate, reducing ambiguity caused by free-length or preload variation.
Yes. Show viewing direction, openings and relative angle, and include mating-pin dimensions.
The geometric limit should not be a routine working point. Maximum extension must be reviewed against stress and cycle life.