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Key & Keyway

Tangential force at the shaft surface F = 2T/d. The key fails in shear across w×L, or in bearing on the half-height (h/2)×L. Key sizes follow DIN 6885 / ISO 773. Get T from the shaft tool.

Calculator

Torque T (N·mm)

Shaft Ø d (mm)

Key length L (mm)

Key width w (mm)

Key height h (mm)

Recommended (DIN 6885)

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Tangential force

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Shear stress

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Bearing stress

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Assumes uniform load along the key. A helper, not a substitute for engineering judgment.