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Lead Screw Torque

Raise/lower torque for a power screw (square thread, or ACME via thread half-angle), plus efficiency and self-locking check. Add thrust-collar friction below. Units: mm, N → N·mm.

Calculator

Axial load F (N)

Mean Ø dm (mm)

Lead l (mm)

Thread friction µ

Thread half-angle α (°, 0=square)

Collar friction µ꜀ (0 = none)

Collar mean Ø d꜀ (mm)

Raise torque

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Lower torque

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Collar torque

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Efficiency

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Self-locking?

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Ball-screw torque (η 0.9)

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Ball-screw figure assumes 90% efficiency. A helper, not a substitute for engineering judgment.