ISO 7146-1-2019 PDF

Full title and description

Plain bearings — Appearance and characterization of damage to metallic hydrodynamic bearings — Part 1: General (ISO 7146-1:2019). This international standard defines, describes and classifies characteristic forms of damage that occur in service to hydrodynamically lubricated metallic plain bearings and journals, illustrated with photographs and diagrams to support identification and attribution of damage causes.

Abstract

This document provides definitions, descriptions and a classification scheme for damage appearances on metallic hydrodynamic plain bearings and journals. It is limited to damage characteristics with well‑defined appearance that can be attributed to specific causes with a high degree of certainty; illustrative photos and diagrams are used to clarify typical damage forms and likely causes.

General information

• Status: Published.
• Publication date: 16 May 2019 (Edition 2, published May 2019).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.100.10 (Plain bearings; plain bearing engineering).
• Edition / version: Edition 2 (2019).
• Number of pages: 53 pages.

Scope

ISO 7146-1:2019 covers the appearance and characterization of damage to metallic hydrodynamically lubricated plain bearings and journals. The scope is restricted to damage appearances that have distinctive, well‑defined morphology and that can, with high confidence, be linked to particular causes; the standard excludes damage types that cannot be reliably associated with specific causes. The document is intended to aid diagnosis, root‑cause analysis and communication of observed bearing damage using standardized terminology and illustrated examples.

Key topics and requirements

• Definitions and terminology for damage appearances on hydrodynamic metallic plain bearings.
• Classification scheme for damage types (appearance-based categories) and guidance for attributing causes.
• Illustrative photographs and diagrams showing typical damage morphologies and examples.
• Guidance on limiting consideration to damage forms with clear diagnostic appearance.
• Reference tables and annex material to support consistent use and interpretation in inspections and reports.

Typical use and users

Used by design and maintenance engineers, tribologists, bearing manufacturers, condition‑monitoring and inspection laboratories, failure‑analysis specialists, and technical authors to standardize description and diagnosis of plain bearing damage, support root‑cause investigations, and inform corrective or preventive measures.

Related standards

ISO 7146 is a multipart series. Notable related parts include ISO 7146-2:2019 (Part 2 — Cavitation erosion and its countermeasures), which and other parts address specific damage modes and mitigation measures; consult the ISO 7146 series for complementary guidance on particular failure mechanisms and countermeasures.

Keywords

plain bearings; hydrodynamic bearings; damage characterization; failure analysis; cavitation erosion; tribology; bearing inspection; ISO 7146; bearing diagnostics.

FAQ

Q: What is this standard?

A: ISO 7146-1:2019 is an international standard that defines and classifies the appearance of damage to metallic hydrodynamic plain bearings to assist identification and attribution of causes.

Q: What does it cover?

A: It covers appearance‑based descriptions and classification of damage to hydrodynamically lubricated metallic plain bearings and journals, illustrated with photos and diagrams; it focuses on damage forms that have a clear, attributable appearance.

Q: Who typically uses it?

A: Bearing designers, maintenance and reliability engineers, tribologists, inspection and failure‑analysis labs, manufacturers, and organizations performing root‑cause analysis or specifying inspection/acceptance criteria.

Q: Is it current or superseded?

A: As of its publication it is Edition 2 (2019). The ISO lifecycle shows the document published in May 2019 and subject to periodic review; check ISO for any later revisions or replacement work items in the ISO 7146 series.

Q: Is it part of a series?

A: Yes — ISO 7146 is a multipart series addressing appearance and characterization of damage to metallic hydrodynamic bearings; Part 2 (ISO 7146-2:2019) covers cavitation erosion and countermeasures, with other parts addressing additional specific damage types or guidance.

Q: What are the key keywords?

A: Plain bearings, hydrodynamic bearings, damage characterization, failure analysis, cavitation erosion, tribology, inspection, ISO 7146.