ISO 286-1 Geometrical Product Specifications Standard

International standard defining the ISO system of limits and fits for geometrical product specifications, including tolerance classes and fundamental deviations for precision manufacturing of key systems and automotive components.

Standard Overview

Standard Code

ISO 286-1:2010

Publication Date

2010-04-15

Status

Active International Standard

Application

Precision Manufacturing

Tolerance Classes

IT01 - IT5

Ultra-high precision tolerances for gauge blocks and precision instruments

IT01: 0.3 + 0.008D μm
IT5: 7D^0.2 μm

IT6 - IT11

High precision tolerances for key manufacturing and automotive components

IT6: 10D^0.2 μm
IT11: 100D^0.2 μm

IT12 - IT18

General purpose tolerances for standard manufacturing processes

IT12: 160D^0.2 μm
IT18: 2500D^0.2 μm

Fundamental Deviations

Hole Basis System (H)

Lower deviation of hole = 0, upper deviation = +IT

H7: 0 to +25 μm (for 18mm)
H8: 0 to +39 μm (for 18mm)

Shaft Basis System (h)

Upper deviation of shaft = 0, lower deviation = -IT

h6: -16 to 0 μm (for 18mm)
h7: -25 to 0 μm (for 18mm)

Frequently Asked Questions

What is ISO 286-1?

ISO 286-1 is an international standard that defines the ISO system of limits and fits for geometrical product specifications, including tolerance classes and fundamental deviations for precision manufacturing.

What are tolerance classes in ISO 286-1?

Tolerance classes in ISO 286-1 range from IT01 to IT18, where IT01 represents the highest precision and IT18 the lowest precision for manufacturing tolerances.

How does ISO 286-1 apply to key manufacturing?

ISO 286-1 provides the foundation for precision key manufacturing by defining tolerance classes and fundamental deviations that ensure proper fit and function in lock mechanisms.

What is the difference between hole and shaft basis systems?

In hole basis system (H), the hole dimension is fixed and shaft varies. In shaft basis system (h), the shaft dimension is fixed and hole varies. This determines which component maintains the nominal dimension.

Official Standards Authority

ISO International Organization

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