SuperNX / Tools

Tools

Free engineering calculators — no login, no upload, everything computed in the page from published standard tables (the same tables served as JSON under /data).

• ISO 286 Fit Calculator

  Hole and shaft limits, min/max clearance and fit type (clearance / transition / interference) for any nominal size — H7/g6, H7/p6, and the rest of the ISO 286 system.

• Tolerance Stack-Up Calculator

  Editable dimension chain with live worst-case (ΣT) and statistical (RSS, ≈±3σ) closing-gap results. Add parts, flip directions, see the gap breathe.

Machine-readable data

Self-describing JSON endpoints for agents and scripts — source, units, license and disclaimer included in every file.

• iso-286.json

  IT grades IT5–IT12 across 13 nominal size steps, plus shaft and hole fundamental deviations (µm) for the common letters.

• iso-2768.json

  Permissible deviations for linear dimensions and radii/chamfer heights, classes f / m / c / v (±mm).

• gdt.json

  The 14 ASME Y14.5 geometric tolerancing symbols — glyph, category, datum requirement and plain-English meaning.