Fits, Tolerances & GD&T
Every fits, tolerances & gd&t calculator on CalcEngines — each with its formula, a worked example, the standard it follows and the assumptions it makes.
7 calculators in this section
- GO / NO-GO Gauge Tolerance CalculatorPlug and ring gauge sizes from the feature's own tolerance — GO at the maximum material limit with its wear allowance, NO-GO at the least material limit — with the gauge maker's tolerance, the Taylor principle that decides their shapes, and how much of the design band is left once the gauges have taken theirs.
- ISO 2768 General Tolerance CalculatorEvery general tolerance ISO 2768 gives for the letters in your title block — linear, angular, broken edges, straightness, flatness, perpendicularity, symmetry and run-out — each from the length the standard actually keys it on, with the IT grade the note amounts to and the fact that ISO 2768-2 has been withdrawn.
- ISO 286 Fit CalculatorHole limits, shaft limits and the real clearance or interference range for any ISO 286 pair — H7/g6, H7/n6, H8/f7, H11/c11 and 700 more — with the class of fit, the hole-basis and shaft-basis equivalence, and every band computed from the standard's own rules rather than copied from a table.
- IT Grade Tolerance CalculatorThe ISO 286 standard tolerance for any grade from IT01 to IT18 at any size from 1 to 500 mm, derived from the standard's own tolerance factor i = 0.45·∛D + 0.001·D and its grade multipliers — with the manufacturing processes that hold each grade, and the reverse: the finest grade that covers a tolerance you already have.
- Thermal Effect on Fit CalculatorWhat an ISO 286 fit specified at 20 °C actually becomes at operating temperature, from the two materials' expansion coefficients — the temperature at which interference turns to clearance, the heating needed to assemble a shrink fit, and the correction for measuring the parts warm.
- Tolerance Stack-Up CalculatorWorst-case and RSS assembly tolerance for a chain of up to six contributors, with the mean-shift model that sits between them and the reverse allocation — plus a plain statement of what each answer assumes about your processes, and where Bender's 1.5 factor makes the statistical answer wider than the worst case.
- True Position and MMC Bonus CalculatorTrue position from an X and Y deviation — doubled, because a position tolerance is a diameter — with the MMC or LMC bonus the feature's size earns, the total allowed, the virtual condition a functional gauge is made to, and a pass or fail verdict.