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ISO 286 fit tolerance calculator: hole and shaft deviations

Limit deviations of hole and shaft per ISO 286 (H7, g6, k6, p6…) up to 500 mm, with maximum and minimum clearance and the fit type. Free, no sign-up.

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Pre-filled example

A Ø 50 H7 hole and a g6 shaft, a common sliding fit.

mm

Result

25µmHole, upper deviation ES

Hole, lower deviation EI
0µm
Shaft, upper deviation es
-9µm
Shaft, lower deviation ei
-25 µm
Maximum clearance
50 µm
Minimum clearance (negative: interference)
9 µm
Fit
Clearance
Diameter range
30-50
Attach this calculation to a work order

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Shaft and hole tolerances written on the work order

Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.

The CMMS software comparison, our gaps included
  • Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
  • On the technician's phone, even without a network.
  • In the machine's history, for the next breakdown.
  • The asset's nameplate data pre-fills the calculation.
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Reglova · Calculations · Work order WO-AT01-04219
Silent video, 33 s: from the work order for an oil leak on a shear cylinder, the tightening torque of an M12 bolt, then "Attach to the work order". A step to tighten it to 93.1 N·m lands in the checklist (step text from the French demo data). Watch the video

When you need ISO 286 fit tolerances

  1. 01

    Check a worn shaft with a micrometer before refitting a bearing or a gear.

  2. 02

    Choose the tolerance for a shaft to be re-machined.

  3. 03

    Read a drawing without looking up the standard's tables.

Good to know

A negative minimum clearance is an interference. For a bearing, the shaft tolerance depends on the load and the direction of rotation: follow the manufacturer's catalogue.

ISO 286 limit deviations and clearance

For a nominal diameter up to 500 mm and a pair of tolerance classes (H7/g6, H7/k6, H7/p6…), the calculator gives the upper and lower deviations of the hole and the shaft in micrometres, the maximum and minimum clearance, and says whether the fit is a clearance, transition or interference fit.

Formula · Reference documents

Hole H: EI = 0, ES = IT ; shaft: es or ei from the fundamental deviation, the other at ± IT ; max clearance = ES − ei, min clearance = EI − es

ISO 286-1 and ISO 286-2

Inputs and accepted ranges
InputUnitAccepted rangeExample
Nominal diametermm0.1 to 50050 mm
Hole tolerance6 optionsH7
Shaft tolerance22 optionsg6
Calculated results
  • Hole, upper deviation ESµm
  • Hole, lower deviation EIµm
  • Shaft, upper deviation esµm
  • Shaft, lower deviation eiµm
  • Maximum clearanceµm
  • Minimum clearance (negative: interference)µm
  • Fit
  • Diameter rangemm

Shaft rework tracked on the machine's work orders

  • Breakdowns reported by QR code
  • Work orders on the phone, even without a network
  • Mandatory inspections reminded by email
  • Audit file as a PDF, in one click
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Free during the beta, no credit card