Printable shop charts
The charts that end up taped to the wall above the drill press, redone properly: every number computed from the published standard, one sheet each, sized to print on A4 or US Letter. Free, no sign-up, no watermark.
Tap Drill ChartEvery common metric, UNC and UNF thread with its tap drill and clearance hole. The one for the wall above the drill press.Drill Size ChartAll 163 number, letter and fractional drills in one ascending run, with decimal inch, millimetres and the tap each one drills for.Bolt Torque ChartTightening torque for metric property classes and SAE grades, with the multiplier for oiled and anti-seize threads.Spanner & Allen Key ChartFor each bolt: the spanner or socket, the Allen key for its cap screw, the tap drill and the clearance hole.Wire Size ChartAWG ampacity at 60, 75 and 90 °C, and the copper size for any load and run length with voltage drop taken into account.Wire Ampacity Derating ChartHow far to derate copper for hot rooms and full conduits: temperature factors, conductor-count factors and the derated amps for every size from 14 AWG to 500 kcmil.Bearing Size ChartEvery common deep-groove ball bearing from 604 to 6320 by bore code and series, with what 2RS, ZZ and C3 mean.IEC Motor Frame ChartEvery IEC frame from 63 to 355: shaft height, foot hole spacing, shaft size and the kW normally built on it, plus B3/B5/B14.NEMA Motor Frame ChartNEMA T frames from 56 to 449T with shaft height, foot holes, shaft size and typical HP — and what C, TS and JM mean.Motor Full-Load Current ChartFull-load amps for three-phase motors at 208 to 575 V with the copper size for each, and typical IEC amps at 400 V.Motor Efficiency Class ChartMinimum efficiency for IE1 to IE4 at every standard rating, and which class the EU lets you buy now.IE3/IE4 Motor Compliance Chart (EU 2026)Which IE class a new motor must be in the EU, whether an old IE1 or IE2 motor may keep running or be rewound, and what an upgrade saves — with a checker for your nameplate.
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The Shop Sheet, once a month: one new printable chart, and one standards gotcha that catches people out — the kind of wrong number a forum thread or an AI answer gives with total confidence. No sales emails.