Overview
ISO 1132-1:2000 - "Rolling bearings - Tolerances - Part 1: Terms and definitions" establishes the standardized vocabulary and symbols used in International Standards that specify tolerances for rolling bearings. Rather than giving numerical tolerance limits, this part defines the key terms, general conditions of application and conceptual framework for tolerances on boundary dimensions, geometrical accuracy, running accuracy and internal clearance. This foundational document ensures consistent interpretation of tolerance requirements across design, manufacturing and inspection documents for rolling bearings.
Key topics
- Terms and definitions: Precise definitions for terminology used in bearing tolerance standards (axes, directions, planes, positions, surfaces).
- Symbols and notation: Standardized symbols for concepts and dimensional conventions used throughout ISO 1132 series.
- Boundary dimensions: Vocabulary for external and internal envelope dimensions relevant to bearing fits and assemblies.
- Geometrical accuracy: Definitions for geometric characteristics (form, position and orientation) that affect bearing performance.
- Running accuracy: Terminology describing rotational behaviour, including runout and related measures that influence vibration and noise.
- Internal clearance: Standardized definitions for radial and axial clearance states used in bearing selection and specification.
- General conditions: Scope of applicability and the conditions under which tolerance terms apply (reference to Part 2 for measurement methods).
- Supporting material: Annex with explanatory notes (e.g., dimensional tolerances on diameters), bibliography and index.
Practical applications
ISO 1132-1 is essential for anyone who creates, reads or enforces bearing tolerance specifications:
- Design engineers use the definitions to specify correct tolerance classes and communicate dimensional/functional requirements in drawings and BOMs.
- Manufacturers and suppliers adopt the vocabulary to produce bearings to agreed requirements and supply consistent technical datasheets.
- Quality and metrology teams reference the terms when preparing inspection plans, interpreting measurement results and reporting compliance.
- Purchasing and procurement rely on uniform terminology to create unambiguous purchase specifications and contracts.
- Maintenance and reliability engineers use consistent clearance and accuracy terms to evaluate bearing condition and replacement specifications.
Related standards
- ISO 1132-2 - Measuring and gauging principles and methods (complements Part 1 by specifying how the defined terms are measured).
- Other bearing and tolerance standards may reference ISO 1132-1 for terminology consistency.
By standardizing the language around rolling bearings tolerances, ISO 1132-1 helps reduce ambiguity in technical documentation and supports reliable, interoperable bearing design, manufacture and inspection.
