Free reference tables and calculators for mechanical design and drafting — based on UNI/EN/ISO standards. Use them right in your browser, no account needed.
Pitch, major/pitch/minor diameter and tap drill size for M1 to M68, coarse pitch series.
Open tool →Tolerance field and fit calculator, plus a browsable library of ISO 286-2 preferred fits.
Open tool →Dimension tables for bolts, nuts and washers, ISO standard sizes.
Open tool →Quick ISO 898-1 and precise VDI 2230 methods for bolted joints.
Open tool →Pressure, force, torque, length and more, for mechanical engineering.
Open tool →MechaHandbook puts this whole reference library in your pocket — no signal required.
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