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Spline Torque Capacity

Spacing errors mean only a fraction of spline teeth actually share the load — typically about 25%. Capacity comes from the allowable side pressure on the tooth flanks, checked against tooth shear.

Pitch diameter (mm)

Number of teeth

Engagement length (mm)

Tooth height in contact (mm)

Tooth width at root (mm)

Allowable side pressure (MPa)

Allowable shear (MPa)

Engagement factor

Effective teeth

—

Capacity — side pressure

—

Capacity — shear

—

Governed by

—

Allowable torque

—

First-order estimate. A full check (SAE J498 / ANSI B92.1) also covers bursting of the external member, root fatigue and misalignment derating — and fretting, which kills more splines than overload.

A helper, not a substitute for engineering judgment. Verify against the governing standard.