# Allowable helical torsional stress (hardened and tempered carbon

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S_y =
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Carol.Allowable helical torsional stress (hardened and tempered carbon
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05360a4d-d4ec-11e3-b7aa-bc764e2038f2

The tensile strength of spring steel may be found as:

S_"ut" = A/d^m, where A and m are uniquely defined for American National Standards Institute (ASTM) materials (see Notes Page):

The allowable stress sigma then for a spring of hardened and tempered carbon and low-alloy steel is then given by this equation as:
S_y = sigma = 0.87 S_ut