Compression
Rate, load, stress, and manufacturability checks.
Engineering Tools
Select a spring type to launch the dedicated calculator.
Rate, load, stress, and manufacturability checks.
Initial tension, working load, and geometry intake.
Torque/angle planning and torsion geometry capture.
Three calculators, built on the standard closed-form equations from the Spring Manufacturers Institute and Shigley’s Mechanical Engineering Design. No sign-up, no email gate. They exist because most spring enquiries arrive as a sketch and a load requirement, and it is faster for everyone if the obvious questions get answered before a drawing changes hands.
Spring rate, load at deflection, corrected stress with the Wahl factor, solid height, spring index, safe travel and estimated weight. Handles all four standard end types — closed and ground, closed and squared, open and ground, plain — because end type changes both active coils and solid height.
Rate, working load including initial tension, and body stress alongside hook bending stress reported separately, since the hook is where extension springs normally fail. Drive it from geometry you already have, or from a load point you need to hit.
Rate per degree, torque at angle, and both uncorrected and inner-fibre bending stress — the inner surface being where torsion springs crack. Also reports the loaded inside diameter, which matters when the spring runs over a shaft.
All three return static engineering estimates. None model fatigue and cycle life, set and relaxation, buckling, temperature, or the tolerance stack of a production run — and any of those can decide whether a spring survives. Use them to scope a design and rule out the impossible, then send us the drawing for a specification we will stand behind.
Seven materials are covered across all three: music wire (A228), hard drawn MB (A227), oil tempered (A229), chrome silicon (A401), 302 and 316 stainless (A313), and 17-7 PH stainless (631). Every calculator works in inches or millimetres.