Engineering Calculators

Calculate bolt preload from applied torque, or required torque for a target clamp load. Covers SAE, metric, and stainless fasteners with friction coefficients.

Convert any decimal or mm dimension to the nearest imperial fraction — floor, ceiling, or closest — to any denominator from halves to thousandths. Exact-match detection included.

Calculate bonus tolerance for MMC and LMC material condition modifiers. Shows virtual condition, resultant condition, and total tolerance across the size range.

Lame equations for cylindrical interference fits — contact pressure, hoop stress, safety factor, torque/force capacity, thermal assembly, ASME B4.1 fit classes.

Find the right tap drill for any UNC, UNF, UNEF, or metric thread. Adjustable thread engagement percentage with nearest standard drill sizes — number, letter, fractional, and metric.

1D linear tolerance stackup with worst-case, RSS, and modified RSS analysis. Sensitivity ranking shows where your tolerance budget is going. Reverse-solve mode proposes which tolerances to tighten when the stackup doesn't close.