Who it's for
- Mechanical engineers defining fit classes
- Manufacturing engineers checking machinability
- Quality engineers validating target clearances
Tool page
Limits and Fits Calculator (ISO 286 Logic)
Calculate hole and shaft fits with deterministic ISO 286 logic. ANSI/ASME B4.1 is available as guidance mode.
What it solves
Spreadsheet fit logic becomes fragile over time, making review and repeatability difficult across projects.
Validation basis: Deterministic ISO 286 calculations with ANSI/ASME B4.1 guidance mode
How it works
- 01Select fit inputs for hole and shaft pairs.
- 02Run deterministic ISO 286 table calculations.
- 03Review limits, fit class, and recommendation details.
- 04Save results for documentation and procurement handoff.
Outputs and exports
- Structured fit result output
- Calculated upper/lower limit values
- Saved result snapshots
Limitations and scope
- Deterministic only (no AI decision layer).
- ISO 286 is the direct calculation path.
- ANSI/ASME B4.1 runs in guidance mode, not a licensed table lookup.
- Does not replace application-specific compliance review.
Accuracy and scope notice
DatumPilot provides engineering decision support. It is not a metrology certification body and does not replace professional engineering judgment, drawing authority, or required quality controls.