ISO TR 10657-2021 PDF

Full title and description

ISO/TR 10657:2021 — Explanatory notes on ISO 76. This technical report provides supplementary background information and explanatory material to support the formulae and factors given in ISO 76:2006 (rolling bearings — static load ratings).

Abstract

ISO/TR 10657:2021 supplies explanatory notes, worked background and derivations for the expressions used in ISO 76:2006 for calculating basic static load ratings and static equivalent loads of rolling bearings. It is intended to clarify assumptions, show intermediate steps in derivations and provide users with additional insight into the factors and limits applied in ISO 76.

General information

• Status: Published.
• Publication date: 12 November 2021 (edition 2 / 2021).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.100.20 (Rolling bearings).
• Edition / version: Edition 2 (2021).
• Number of pages: 38 pages.

Scope

Provides supplementary background information regarding the derivation of formulae and factors given in ISO 76:2006 (Rolling bearings — Static load ratings). The report is explanatory and supportive in nature — it is not a normative replacement of ISO 76 but intended to improve user understanding of how static load ratings and static equivalent loads are derived and where applicable limits or assumptions arise.

Key topics and requirements

• Derivation and explanation of the formulae used to calculate basic static load ratings in ISO 76.
• Discussion of the assumptions behind contact stress values and permissible permanent deformations used in ISO 76.
• Worked examples and intermediate steps to clarify factors and coefficients appearing in ISO 76.
• Guidance on the applicability and limitations of the ISO 76 methods (e.g., bearing designs and operating conditions where the standard’s calculations may be inappropriate).
• Background material intended to support engineers and standards users in interpreting and applying ISO 76 calculations consistently.

Typical use and users

Used by bearing designers, mechanical engineers, application engineers, standards committees, test laboratories and technical authors who need a deeper understanding of the derivation and limits of static load rating calculations in ISO 76. It is especially useful when selecting bearings for heavily loaded or borderline applications where clarity about assumptions and safety factors is required.

Related standards

Directly related to ISO 76:2006 (Rolling bearings — Static load ratings), which it explains and supports. Other closely associated bearing standards include ISO 281:2007 (Rolling bearings — Dynamic load ratings and rating life) and additional ISO documents on bearing geometry, tolerances and life calculation methods; users should consult ISO 76 together with ISO/TR 10657:2021 for static-rating work and ISO 281 for dynamic-rating and life calculations.

Keywords

ISO/TR 10657, explanatory notes, ISO 76, static load rating, rolling bearings, derivation, contact stress, bearing calculations, technical report, ISO/TC 4/SC 8.

FAQ

Q: What is this standard?

A: ISO/TR 10657:2021 is a technical report (explanatory document) that provides background information and derivations for the formulae and factors used in ISO 76:2006 (rolling bearings — static load ratings). It is published by ISO and intended to clarify the calculations in ISO 76.

Q: What does it cover?

A: It covers explanatory material: derivations, assumptions, worked steps and background about contact stress values and coefficients used to determine basic static load ratings and static equivalent loads for rolling bearings. It does not change the normative text of ISO 76 but supplements user understanding.

Q: Who typically uses it?

A: Bearing designers, application and mechanical engineers, test laboratories and standards developers who need to understand the theoretical basis and limits of the static-rating calculations in ISO 76.

Q: Is it current or superseded?

A: ISO/TR 10657:2021 is the current (published) edition of this technical report (published November 2021). It replaces the earlier ISO/TR 10657:1991 explanatory report. Users should check ISO for any later revisions, but as of the 2021 publication this is the active explanatory report.

Q: Is it part of a series?

A: It is part of the body of ISO documents related to rolling bearings developed by ISO/TC 4/SC 8 and should be used alongside ISO 76 (static load ratings), ISO 281 (dynamic load ratings and rating life) and other bearing-related ISO standards.

Q: What are the key keywords?

A: Static load rating, rolling bearings, basic static load rating, static equivalent load, derivation, contact stress, ISO 76, explanatory notes, technical report.