Shaft Diameter (IACS UR M68)

Minimum intermediate shaft diameter per IACS UR M68 from rated power, rpm and material UTS.

StructuralIACS M68

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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 = 100 \cdot \sqrt[3]{\frac{P \cdot k}{N}} \cdot \frac{560}{\sigma_\text{UTS} + 160}

Symbol	Meaning	Unit
$P$	Rated shaft power	kW
$N$	Shaft rpm at rated power	rpm
$\sigma_\text{UTS}$	Material ultimate tensile strength	N/mm²
$k$	Installation factor
$d$	Shaft diameter	mm

Source: IACS UR M68 - Shaft Design

Minimum intermediate shaft diameter per IACS UR M68 from rated power, rpm and material UTS.