iCrank Spring Designer

The Web's best Machine Design Guide for Mechanical Engineers and Designers

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Need a custom torsion spring, or the numbers on a stock spring? Here's a great tool.

TORSION SPRING DESIGNER

INPUTS:		How to use this tool (tips)
d =	Wire Diameter (or side of square)(in)	TYPE of WIRE
ID =	Inside Diameter (free)(in)	Round
N =	Number of Active Coils (-)	Square
Fw =	Working Deflection (radial degrees)
i =	Increment (radial degrees)
E =	Modulus of Elasticity in tension (Mpsi) (millions of psi)	Name: (optional descriptive text for this iteration)

E values for some Common spring materials (Mpsi):
Music Wire	(millions of psi)
Up to .032"	29.50
.033 to .063"	29.00
.064 to .125"	28.50
.126 to .250"	28.00
Stainless Steel
302, 304, 316	28.0
17-7 PH	29.5
420	29.0
431	29.5
Elgiloy*	29.5

* Trade name of Hamilton Watch Company

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