---
type: "fit-designation"
designation: "p6"
letter: "p"
it_grade: "ITIT6"
feature: "shaft"
role: "Light interference shaft for locational press fits in steel."
size_count: 13
size_range_mm: "5–100"
standard: "ISO 286-1:2010, ISO 286-2:2010"
verified: "August 1, 2026"
url: https://shopmath.org/fits/p6
---

# p6 Tolerance — ISO 286 Shaft Limits by Nominal Size

A 25 mm p6 shaft runs 25.022 to 25.035 mm — deviations +22 to +35 µm on a 13 µm band. p6 is the ISO 286 shaft tolerance built from fundamental deviation p and standard tolerance grade ITIT6. Light interference shaft for locational press fits in steel.

- **Designation**: p6
- **Feature**: shaft
- **Fundamental deviation**: p — Light interference
- **Tolerance grade**: ITIT6
- **Typical use**: Light interference shaft for locational press fits in steel.
- **Standard**: ISO 286-1:2010, ISO 286-2:2010

## p6 Limits and Deviations by Nominal Size

Deviations are in micrometres from the nominal size; limits are the finished diameters in millimetres. Sizes that carry their own page are linked.

| Nominal size | Upper deviation (µm) | Lower deviation (µm) | Min shaft Ø (mm) | Max shaft Ø (mm) | IT tolerance (µm) |
| --- | --- | --- | --- | --- | --- |
| [5 mm](https://shopmath.org/fits/p6/5mm.md) | +20 | +12 | 5.012 | 5.020 | 8 |
| [6 mm](https://shopmath.org/fits/p6/6mm.md) | +20 | +12 | 6.012 | 6.020 | 8 |
| [8 mm](https://shopmath.org/fits/p6/8mm.md) | +24 | +15 | 8.015 | 8.024 | 9 |
| [10 mm](https://shopmath.org/fits/p6/10mm.md) | +24 | +15 | 10.015 | 10.024 | 9 |
| [12 mm](https://shopmath.org/fits/p6/12mm.md) | +29 | +18 | 12.018 | 12.029 | 11 |
| [16 mm](https://shopmath.org/fits/p6/16mm.md) | +29 | +18 | 16.018 | 16.029 | 11 |
| [20 mm](https://shopmath.org/fits/p6/20mm.md) | +35 | +22 | 20.022 | 20.035 | 13 |
| [25 mm](https://shopmath.org/fits/p6/25mm.md) | +35 | +22 | 25.022 | 25.035 | 13 |
| [30 mm](https://shopmath.org/fits/p6/30mm.md) | +35 | +22 | 30.022 | 30.035 | 13 |
| [40 mm](https://shopmath.org/fits/p6/40mm.md) | +42 | +26 | 40.026 | 40.042 | 16 |
| [50 mm](https://shopmath.org/fits/p6/50mm.md) | +42 | +26 | 50.026 | 50.042 | 16 |
| [80 mm](https://shopmath.org/fits/p6/80mm.md) | +51 | +32 | 80.032 | 80.051 | 19 |
| [100 mm](https://shopmath.org/fits/p6/100mm.md) | +59 | +37 | 100.037 | 100.059 | 22 |

_ISO 286 tabulates deviations per size band, so a value holds across the whole band a nominal size falls in, not just at that exact diameter._

## Sources and Method for p6

### p6 deviations

- **Source**: limits computed from the compiled ISO 286 tables: ISO 286-1 IT grades and ISO 286-2 fundamental deviations, compiled from saucecode/ISO286 (LGPL-2.1) and parkergreene/isofits (MIT), cross-checked cell-for-cell
- **Method**: computed
- **Verified against**: parkergreene/isofits ISO 286-2 limit tables (MIT); ISO 286-1 formula harness — 2067 checks passed

### Assumptions

- Values are the ISO 286-2 tabulated limits, not the ISO 286-1 formula: the formula deviates from the table by up to 13.26% and is carried only as a validation harness.
- Limits are at 20 °C, the ISO 1 reference temperature.
- Dataset scope: COMPILED not computed: the ISO 286-1 formula deviates up to 13.26% from the table and is used only as a harness (warn >5%, fail >15%). EXCLUDED: shaft/hole letters s, t, u and the fits H7/s6, H7/t6, H7/u6 — no free source and an undetermined step constant in the formula.

**Data last verified**: August 1, 2026

## Common Questions About the p6 Tolerance

### What is an p6 tolerance?

p6 is an ISO 286 shaft tolerance: fundamental deviation p at IT grade IT6. Light interference shaft for locational press fits in steel. Light interference describes what the p deviation does.

### What is the tolerance on a 25 mm p6 shaft?

A 25 mm p6 shaft runs 25.022 to 25.035 mm — deviations +22 to +35 µm, a tolerance band of 13 µm.

## Fits Built on p6

Standard hole/shaft pairs that use p6 as their shaft.

| Fit | Classification | Basis | Typical use |
| --- | --- | --- | --- |
| [H7/p6](https://shopmath.org/fits/h7-p6.md) | Interference | hole basis | Locational interference. Rigid location in steel without the load capacity of a drive fit. |

## Related pages

- All fits and tolerances: [ISO 286 fit reference](https://shopmath.org/fits.md)
- Full grade table: [ISO 286 tolerance chart](https://shopmath.org/charts/iso-tolerances.md)

---

*Source: [ShopMath](https://shopmath.org/fits/p6) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*