ISO 3548-1:2022 PDF

Plain bearings — Thin-walled half bearings with or without flange — Part 1: Tolerances, design features and methods of test

Open preview (PDF)

Title (English):

ISO 3548-1:2022

Plain bearings — Thin-walled half bearings with or without flange — Part 1: Tolerances, design features and methods of test

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 27
Publication date:: August 15, 2022
Edition:: ISO IS 3548 edition 2 version 1
ICS:: 21.100.10

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

This document specifies tolerances, design features and test methods for thin-walled half bearings with integral flange up to an outside diameter of Do = 250 mm and without flange up to an outside diameter of Do = 500 mm. Due to the variety of design, it is, however, not possible to standardize the dimensions of the half bearings. Half bearings according to this document are predominantly used in reciprocating machinery and consist of a steel backing and one or more bearing metal layers on the inside. In reciprocating machinery, flanged half bearings can be used in connection with half bearings without flange. Alternatively, to serve as a flanged half bearing, it is possible to use a half bearing without flange together with two separate half thrust washers according to ISO 6526, or a half bearing with assembled flanges. NOTE All dimensions and tolerances are given in millimetres.

Technical details

Technical committee: ISO/TC 123/SC 3 - Dimensions, tolerances and construction details
SKU: ISO 3548-1:2022

Abstract

Overview

ISO 3548-1:2022 - Plain bearings: Thin-walled half bearings with or without flange - Part 1 specifies tolerances, design features and test methods for thin-walled half bearings used predominantly in reciprocating machinery. The standard covers half bearings with integral flanges up to an outside diameter Do = 250 mm and without flanges up to Do = 500 mm. All dimensions and tolerances are given in millimetres. This second edition (2022) updates symbols, figures and normative references to reflect current measurement and manufacturing practice.

Key topics and technical requirements

Scope & limits: Flanged half bearings ≤ 250 mm outside diameter; non‑flanged ≤ 500 mm. Dimensions are flexible and peripheral length is measured rather than direct outside diameter.
Tolerances: Specified for crush height, wall thickness and widths - tolerances differ for “as‑machined” versus “as‑plated” bearing bores. Housing diameter manufacturing tolerance recommended as H6 (ISO 286‑2).
Measurement methods: Peripheral length measured with special checking fixtures; two checking methods (A and B) and procedures for calculating the effective test force F are defined.
Design features: Guidance on locating nicks and recesses, reliefs and chamfers, transition between radial part and flange, assembled flange toes, oil grooves and oil holes, and permissible surface roughness of sliding surfaces.
Eccentric bores: Accepts eccentric (crowned) bore designs; eccentricity controlled via a specified wall‑thickness reduction u measured at defined angles/points.
Assembled flange function: Test data and classification for assembled flange bearings including axial width checks and checklist items to ensure correct function under load.
Units and symbols: Complete symbol table and diagrams for dimensions such as a (crush height), s (wall thickness), B (width), P (free spread), and Ra (surface roughness).

Applications and users

Who uses it: Mechanical designers, plain bearing manufacturers, OEMs of reciprocating engines and compressors, quality/control engineers, test laboratories and procurement/specification writers.
Practical uses:
- Specify and verify bearing components for reciprocating machinery.
- Ensure correct interference fit and housing tolerances (H6) for reliable service.
- Define inspection and test procedures for peripheral length, crush height and assembled flange performance.
- Guide layout of oil grooves, locating nicks and chamfers to optimize function and assembly.

Related standards

ISO 3548-3 - Measurement of peripheral length for thin-walled half bearings
ISO 6526 - Pressed bimetallic half thrust washers - features and tolerances
ISO 21920-3 - Surface texture (profile) - specification operators

Practical takeaway: ISO 3548-1:2022 is the authoritative reference for designers and manufacturers of thin‑walled half bearings, providing standardized tolerances, mandatory testing approaches and design guidance to ensure interchangeability and reliable operation in reciprocating machinery. Keywords: ISO 3548-1:2022, thin-walled half bearings, plain bearings, tolerances, test methods, flanged half bearings, crush height, peripheral length.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope & limits: Flanged half bearings ≤ 250 mm outside diameter; non‑flanged ≤ 500 mm. Dimensions are flexible and peripheral length is measured rather than direct outside diameter.
Tolerances: Specified for crush height, wall thickness and widths - tolerances differ for “as‑machined” versus “as‑plated” bearing bores. Housing diameter manufacturing tolerance recommended as H6 (ISO 286‑2).
Measurement methods: Peripheral length measured with special checking fixtures; two checking methods (A and B) and procedures for calculating the effective test force F are defined.
Design features: Guidance on locating nicks and recesses, reliefs and chamfers, transition between radial part and flange, assembled flange toes, oil grooves and oil holes, and permissible surface roughness of sliding surfaces.
Eccentric bores: Accepts eccentric (crowned) bore designs; eccentricity controlled via a specified wall‑thickness reduction u measured at defined angles/points.
Assembled flange function: Test data and classification for assembled flange bearings including axial width checks and checklist items to ensure correct function under load.
Units and symbols: Complete symbol table and diagrams for dimensions such as a (crush height), s (wall thickness), B (width), P (free spread), and Ra (surface roughness).

Applications and users

Who uses it: Mechanical designers, plain bearing manufacturers, OEMs of reciprocating engines and compressors, quality/control engineers, test laboratories and procurement/specification writers.
Practical uses:
- Specify and verify bearing components for reciprocating machinery.
- Ensure correct interference fit and housing tolerances (H6) for reliable service.
- Define inspection and test procedures for peripheral length, crush height and assembled flange performance.
- Guide layout of oil grooves, locating nicks and chamfers to optimize function and assembly.

Related standards

ISO 3548-3 - Measurement of peripheral length for thin-walled half bearings
ISO 6526 - Pressed bimetallic half thrust washers - features and tolerances
ISO 21920-3 - Surface texture (profile) - specification operators

ISO 3548-1:2022 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of…

Plain bearings. Thin-walled half bearings with or without flange - Measurement of peripheral length

Plain bearings - Pressed bimetallic half thrust washers - Features and tolerances

Geometrical product specifications (GPS) - Surface texture: Profile - Part 3: Specification operators (ISO 21…