IACS UR M71 - Crankshaft Scantling Check

Crankshaft pin and journal diameter screening per IACS UR M71 - simplified minimum shaft formula used for scantling approval.

IACSM71Crankshaft

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

d_{min} = \left(\frac{16 T}{\pi \sigma}\right)^{1/3}

Symbol	Meaning	Unit
$T$	Shaft torque	N·m
$\sigma$	Allowable shear stress	N/mm²

Source: IACS UR M71 Rev.2

Crankshaft pin and journal diameter screening per IACS UR M71 - simplified minimum shaft formula used for scantling approval.