Calculator
Compression Spring
Check a helical compression spring of round wire: its rate, the wire stress at the working force and when closed solid, fatigue over the load cycle, buckling and surge. Updates as you type.
Why the inside of a coil is stressed most, and what solid-safe means: spring design, explained.
Sign in to save and reload setups.
Wire and coil
Mean diameter is the outside diameter minus one wire diameter. Music wire: the strongest small wire, to 120 °C.
Length and ends
Load cycle
F_min is the preload the spring never drops below; a spring that returns to its free length has F_min = 0.