IT Tolerance Grades

ISO 286 standard tolerance (IT) grades — the width of a tolerance band in micrometres by nominal size. A fit like H7/g6 combines two IT grades.

Nominal size	IT6	IT7	IT8	IT9	IT10	IT11
≤3 mm	6	10	14	25	40	60
3–6 mm	8	12	18	30	48	75
6–10 mm	9	15	22	36	58	90
10–18 mm	11	18	27	43	70	110
18–30 mm	13	21	33	52	84	130
30–50 mm	16	25	39	62	100	160
50–80 mm	19	30	46	74	120	190
80–120 mm	22	35	54	87	140	220
120–180 mm	25	40	63	100	160	250
180–250 mm	29	46	72	115	185	290

Values are µm. Apply to a hole/shaft with the Limits & Fits tool.

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