What is the tolerance for a 80 mm H7 hole?

A 80 mm H7 hole runs 80.000 to 80.030 mm — deviations of 0 to +30 µm, a band 30 µm wide.

What is the maximum and minimum size of a 80 mm H7 hole?

Maximum 80.030 mm, minimum 80.000 mm. Anything outside that band is a reject at 20 °C, not a judgement call.

Why is the IT7 band 30 µm at 80 mm?

Because 80 mm falls in the ISO 286 size band over 50 up to 80 mm, and IT7 is defined per band rather than per size. Every nominal size in that band carries the same 30 µm width for IT7.

What shaft goes in a 80 mm H7 hole?

At 80 mm the standard pairs run from H7/h6 (0 to +49 µm clearance) through transition to interference fits — the full list with clearances is on this page.

What does the H in H7 mean?

Zero deviation — the basic hole. It fixes the fundamental deviation — the limit nearest the nominal size — while IT7 fixes the width of the band, which at 80 mm is 30 µm.

ISO 286 · H7 hole · Ø80 mm

80 mm H7 Tolerance — Hole Limits in mm and µm

https://shopmath.org/fits/h7/80mm · data verified August 1, 2026

A 80 mm H7 hole is 80.000 to 80.030 mm — deviations of 0 to +30 µm on an IT7 band 30 µm wide. The default basic hole in hole-basis fitting — reamer and gauge sizes are built around it. Values apply at the ISO 286 reference temperature of 20 °C.

Nominal: 80 mm
Designation: H7
Feature: hole
Grade: IT7
Band: 30 µm

80 mm H7 hole · limits, mm

80.000 … 80.030

Upper dev: +30µm
Lower dev: 0µm
Band: 30µm

Measured at 20 °C on a plain cylindrical feature. The IT7 grade sets the 30 µm width; the H sets where the band sits.

Limits for a 80 mm H7 Hole

Deviations in micrometres, finished limits in millimetres. Both describe the same band — the deviation is what a drawing carries, the limit is what a gauge reads.

80 mm H7 hole tolerance — deviations and limits
Limit	µm	mm
Upper deviation	+30	0.030
Lower deviation	0	0.000
Maximum diameter	+30	80.030
Minimum diameter	0	80.000
Tolerance band (IT7)	30	0.030

Deviations are relative to the 80 mm nominal size. Values apply at the ISO 286 reference temperature of 20 °C; a part measured warm is not at these limits.

ISO 286 Tolerance Grades at 80 mm

80 mm falls in the ISO 286 size band over 50 to 80 mm, so every tolerance in that band has the same width regardless of which letter it carries.

ISO 286 standard tolerance grades at 80 mm nominal size
Grade	Tolerance, µm	Tolerance, mm
IT5	13	0.013
IT6	19	0.019
IT7	30	0.030
IT8	46	0.046
IT9	74	0.074
IT10	120	0.120
IT11	190	0.190
IT12	300	0.300

The grade sets the width of the band; the letter sets where that band sits relative to the nominal size.

Every Other ISO 286 Tolerance at 80 mm

The same nominal size under every other designation in this reference — the comparison that decides whether a feature is called out H7 or something looser.

ISO 286 hole and shaft tolerances at 80 mm nominal size
Property	Property	Deviation, µm		Limits, mm
Designation	Applies to	Upper	Lower	Min	Max
c11	shaft	-150	-340	79.660	79.850
d9	shaft	-100	-174	79.826	79.900
e8	shaft	-60	-106	79.894	79.940
f7	shaft	-30	-60	79.940	79.970
g6	shaft	-10	-29	79.971	79.990
h11	shaft	0	-190	79.810	80.000
h6	shaft	0	-19	79.981	80.000
h7	shaft	0	-30	79.970	80.000
h9	shaft	0	-74	79.926	80.000
k6	shaft	+21	+2	80.002	80.021
m6	shaft	+30	+11	80.011	80.030
n6	shaft	+39	+20	80.020	80.039
p6	shaft	+51	+32	80.032	80.051
r6	shaft	+62	+43	80.043	80.062
F8	hole	+76	+30	80.030	80.076
G7	hole	+40	+10	80.010	80.040
H11	hole	+190	0	80.000	80.190
H6	hole	+19	0	80.000	80.019
H7	hole	+30	0	80.000	80.030
H8	hole	+46	0	80.000	80.046
H9	hole	+74	0	80.000	80.074
K7	hole	+9	-21	79.979	80.009
N7	hole	-9	-39	79.961	79.991
P7	hole	-21	-51	79.949	79.979

Links go to that designation's page for this size where one exists, and to its full size table otherwise.

Standard Fits Available at 80 mm

What each standard hole/shaft pair gives at 80 mm, loosest first. Negative clearance is interference.

ISO 286 fits and their clearance at 80 mm nominal size
Property	Property	Clearance, µm		Property
Fit	Type	Min	Max	What it is for
H7/h6	clearance	0	+49	Locational clearance. Assembles by hand, no free movement intended.
H11/c11	clearance	+150	+530	Loose running. Wide commercial tolerances, large clearance for dirt, paint and thermal growth.
H9/d9	clearance	+100	+248	Free running. Good where accuracy is not essential and clearance can be generous.
H8/e8	clearance	+60	+152	Running fit with room for a lubricant film at speed.
H8/f7	clearance	+30	+106	Close running. The general-purpose lubricated journal fit.
H7/g6	clearance	+10	+59	Sliding. Locates accurately, still moves and turns freely.
H7/k6	transition	-21	+28	Locational transition. Accurate location, assembles with light force.
H7/m6	transition	-30	+19	Locational transition, tighter than k6.
H7/n6	transition	-39	+10	Tight transition. Usually a press job.
H7/p6	interference	-51	-2	Locational interference. Rigid location in steel without the load capacity of a drive fit.
H7/r6	interference	-62	-13	Medium drive. The joint itself carries load.
F8/h7	clearance	+30	+106	Close running, shaft basis.
G7/h6	clearance	+10	+59	Sliding, shaft basis. The h6 shaft is the reference and the hole carries the clearance.
K7/h6	transition	-21	+28	Locational transition, shaft basis.
N7/h6	transition	-39	+10	Tight transition, shaft basis.
P7/h6	interference	-51	-2	Locational interference, shaft basis.

Minimum clearance is the largest shaft in the smallest hole; maximum clearance is the smallest shaft in the largest hole.

Sources and Method for the 80 mm H7 Tolerance

80 mm H7 limitscomputed

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

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.

IT tolerance gradescompiled

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. Formula per ISO 286-1 standard tolerance factor and fundamental deviation formulas, used as a validation harness only per docs/research/data-sourcing.md §3.6

Compiled from independent public sources that agree cell-for-cell.

Formula

Limits from the deviations at 80 mm

max Ø  =  80 mm + (+30 µm)  =  80.030 mm
min Ø  =  80 mm + (0 µm)  =  80.000 mm

The deviations are compiled from the ISO 286-2 tables; the limits are those deviations applied to the nominal size.

Assumptions

Values apply at the ISO 286 reference temperature of 20 °C.
Size only. Form, roundness, cylindricity and surface finish are separate callouts and a part inside these limits can still be unusable without them.
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 80 mm H7 Tolerance Reference

Citation

ShopMath. "80 mm H7 Tolerance — Hole Limits in mm and µm." ShopMath, verified August 1, 2026, https://shopmath.org/fits/h7/80mm

BibTeX

@misc{shopmath-fits-h7-80mm,
  title        = {80 mm H7 Tolerance — Hole Limits in mm and µm},
  author       = {{ShopMath}},
  year         = {2026},
  howpublished = {\url{https://shopmath.org/fits/h7/80mm}},
  note         = {Data verified 2026-08-01}
}

Permanent URL

https://shopmath.org/fits/h7/80mm

Common Questions About the 80 mm H7 Tolerance

What is the tolerance for a 80 mm H7 hole?: A 80 mm H7 hole runs 80.000 to 80.030 mm — deviations of 0 to +30 µm, a band 30 µm wide.
What is the maximum and minimum size of a 80 mm H7 hole?: Maximum 80.030 mm, minimum 80.000 mm. Anything outside that band is a reject at 20 °C, not a judgement call.
Why is the IT7 band 30 µm at 80 mm?: Because 80 mm falls in the ISO 286 size band over 50 up to 80 mm, and IT7 is defined per band rather than per size. Every nominal size in that band carries the same 30 µm width for IT7.
What shaft goes in a 80 mm H7 hole?: At 80 mm the standard pairs run from H7/h6 (0 to +49 µm clearance) through transition to interference fits — the full list with clearances is on this page.
What does the H in H7 mean?: Zero deviation — the basic hole. It fixes the fundamental deviation — the limit nearest the nominal size — while IT7 fixes the width of the band, which at 80 mm is 30 µm.

All 13 H7 sizes · ISO 286 tolerance chart · Every designation and fit