What is the clearance of a 25 mm H7/g6 fit?

A 25 mm H7/g6 fit has +7 to +41 µm of clearance: the hole runs 25.000 to 25.021 mm and the shaft 24.980 to 24.993 mm.

Is H7/g6 a clearance, transition or interference fit?

H7/g6 is a clearance fit. The hole is always larger than the shaft — the parts always assemble with a gap. Sliding. Locates accurately, still moves and turns freely.

What is H7/g6 used for?

Sliding. Locates accurately, still moves and turns freely. It is a hole-basis fit, so the hole is held to one standard tolerance and the shaft is machined to suit.

How does the H7/g6 fit change with size?

Across the 13 verified nominal sizes the clearance runs from +4 µm at 5 mm to +69 µm at 100 mm, because both tolerance bands widen with nominal size.

ISO 286 · clearance fit · hole basis

H7/g6 Clearance Fit — Hole and Shaft Limits by Size

https://shopmath.org/fits/h7-g6 · data verified August 1, 2026

A 25 mm H7/g6 fit gives +7 to +41 µm of clearance — a 25.000–25.021 mm hole on a 24.980–24.993 mm shaft. Sliding. Locates accurately, still moves and turns freely. The hole is always larger than the shaft — the parts always assemble with a gap. All values apply at 20 °C.

Type: clearance
Hole: H7
Shaft: g6
Sizes: 13
Standard: ISO 286-1:2010

H7/g6 at Ø25 mm · clearance, µm

+7 … +41

Hole: 25.000–25.021mm
Shaft: 24.980–24.993mm

Clearance at Ø25 mm, at 20 °C. Every other verified size is in the table below.

H7/g6 Fit — Hole and Shaft Limits with Clearance, by Nominal Size

Both parts' limits in millimetres and the resulting clearance in micrometres. Negative clearance is interference: the shaft is larger than the hole and the joint needs force, heat or cold to assemble.

H7/g6 fit — hole limits, shaft limits and clearance by nominal size
Property	Hole, mm		Shaft, mm		Clearance, µm		Property
Nominal Ø	Min	Max	Min	Max	Min	Max	At this size
5 mm	5.000	5.012	4.988	4.996	+4	+24	clearance
6 mm	6.000	6.012	5.988	5.996	+4	+24	clearance
8 mm	8.000	8.015	7.986	7.995	+5	+29	clearance
10 mm	10.000	10.015	9.986	9.995	+5	+29	clearance
12 mm	12.000	12.018	11.983	11.994	+6	+35	clearance
16 mm	16.000	16.018	15.983	15.994	+6	+35	clearance
20 mm	20.000	20.021	19.980	19.993	+7	+41	clearance
25 mm	25.000	25.021	24.980	24.993	+7	+41	clearance
30 mm	30.000	30.021	29.980	29.993	+7	+41	clearance
40 mm	40.000	40.025	39.975	39.991	+9	+50	clearance
50 mm	50.000	50.025	49.975	49.991	+9	+50	clearance
80 mm	80.000	80.030	79.971	79.990	+10	+59	clearance
100 mm	100.000	100.035	99.966	99.988	+12	+69	clearance

Minimum clearance is the largest shaft in the smallest hole; maximum clearance is the smallest shaft in the largest hole. Values apply at the ISO 286 reference temperature of 20 °C.

The Hole and Shaft Tolerances That Make the H7/g6 Fit

H7/g6 is H7 on the hole and g6 on the shaft. It is a hole-basis fit: the hole is held to one standard tolerance and the shaft is varied to change the fit — which is what you want when the hole is reamed or bored to a standard size.

Hole
H7 →
The default basic hole in hole-basis fitting — reamer and gauge sizes are built around it.
Shaft
g6 →
Sliding shaft with minimal clearance — locates accurately and still moves freely.

Fits That Share a Tolerance With the H7/g6 Fit

Changing one half of the pair is how a design moves from clearance to interference. These fits keep H7 or g6 and change the other side.

ISO 286 fits sharing a hole or shaft tolerance with H7/g6
Fit	Type	What it is for
H7/h6	clearance	Locational clearance. Assembles by hand, no free movement intended.
H7/p6	interference	Locational interference. Rigid location in steel without the load capacity of a drive fit.
H7/r6	interference	Medium drive. The joint itself carries load.
H7/k6	transition	Locational transition. Accurate location, assembles with light force.
H7/m6	transition	Locational transition, tighter than k6.
H7/n6	transition	Tight transition. Usually a press job.

Ordered loosest to tightest within each type.

Sources and Method for the H7/g6 Fit Data

H7/g6 limitscomputed

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

Verified against parkergreene/isofits ISO 286-2 limit tables (MIT); ISO 286-1 formula harness — 2067 checks passed

Computed from the standard's formulas, then checked against published tables.

Formula

Clearance from the two tolerance bands

max clearance  =  hole max − shaft min
min clearance  =  hole min − shaft max

A negative result is interference. Both are computed from the compiled ISO 286-2 deviations, not from the ISO 286-1 formula, which deviates from the published table by up to 13%.

Assumptions

Values apply at the ISO 286 reference temperature of 20 °C. A joint assembled hot or cold, or running hot, is not at these limits.
The tolerances cover size only. Form, roundness, cylindricity and surface finish all affect how a fit behaves and need their own callouts.
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

How this data is built and checked →

How to Cite This H7/g6 Fit Reference

Citation

ShopMath. "H7/g6 Clearance Fit — Hole and Shaft Limits by Size." ShopMath, verified August 1, 2026, https://shopmath.org/fits/h7-g6

BibTeX

@misc{shopmath-fits-h7-g6,
  title        = {H7/g6 Clearance Fit — Hole and Shaft Limits by Size},
  author       = {{ShopMath}},
  year         = {2026},
  howpublished = {\url{https://shopmath.org/fits/h7-g6}},
  note         = {Data verified 2026-08-01}
}

Permanent URL

https://shopmath.org/fits/h7-g6

Common Questions About the H7/g6 Fit

What is the clearance of a 25 mm H7/g6 fit?: A 25 mm H7/g6 fit has +7 to +41 µm of clearance: the hole runs 25.000 to 25.021 mm and the shaft 24.980 to 24.993 mm.
Is H7/g6 a clearance, transition or interference fit?: H7/g6 is a clearance fit. The hole is always larger than the shaft — the parts always assemble with a gap. Sliding. Locates accurately, still moves and turns freely.
What is H7/g6 used for?: Sliding. Locates accurately, still moves and turns freely. It is a hole-basis fit, so the hole is held to one standard tolerance and the shaft is machined to suit.
How does the H7/g6 fit change with size?: Across the 13 verified nominal sizes the clearance runs from +4 µm at 5 mm to +69 µm at 100 mm, because both tolerance bands widen with nominal size.

Every ISO 286 designation and fit · ISO 286 tolerance chart