ISO 12306-1994 PDF

Full title and description

Plain bearings — Measurement of wall thickness of thin-walled half-bearings and thin-walled bushes. This International Standard defines methods and requirements for measuring the wall thickness of thin-walled half-bearings and bushes used in plain-bearing assemblies.

Abstract

Specifies checking methods (line measurement around the circumference, line measurement in the axial direction, and point measurement) and requirements for measuring equipment used to determine wall thickness of thin-walled half-bearings and thin-walled bushes. The standard excludes thermoplastic bushes from its scope and provides guidance on appropriate measurement techniques and equipment characteristics for metallic plain-bearing components.

General information

• Status: Withdrawn.
• Publication date: February 1994.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.100.10 (Plain bearings).
• Edition / version: Edition 1 (1994-02).
• Number of pages: 12.

Scope

Defines procedures and acceptance criteria for measuring the wall thickness of thin-walled half-bearings and thin-walled bushes used in plain-bearing assemblies, including circumferential line measurements, axial line measurements and discrete point measurements. The standard is intended for metallic plain-bearing components and explicitly states that it is not applicable to thermoplastic bushes.

Key topics and requirements

• Measurement methods: circumferential line measurement, axial line measurement and point measurement.
• Requirements and performance characteristics for measuring equipment (accuracy, resolution and calibration practices).
• Instructions for how to position and record measurements on half-bearings and bushes to obtain representative wall-thickness data.
• Exclusions and applicability: standard does not cover thermoplastic bushes and focuses on thin-walled metallic plain bearings.
• Reference to related checking principles given in ISO 12301 and conformance criteria for manufacturing quality control.

Typical use and users

Used by plain-bearing manufacturers, bearing assembly and engine component producers, quality-control and metrology laboratories, design engineers specifying bearing tolerances, and standards committees. Typical applications include production inspection, incoming material checks, process control in machining and finishing of thin-walled bushes and half-bearings, and verification of conformity with dimensional specifications.

Related standards

This standard has been withdrawn and newer standards addressing related bearing topics include ISO 3547-7:2007 and ISO 3548-2:2009; it also references measurement/checking principles in ISO 12301 and is associated with work by ISO/TC 123 (Plain bearings).

Keywords

plain bearing, half-bearing, bush, wall thickness, measurement, metrology, inspection, ISO 12301, thin-walled bearing, bearing quality control

FAQ

Q: What is this standard?

A: ISO 12306:1994 is an International Standard that specifies methods and equipment requirements for measuring the wall thickness of thin-walled half-bearings and thin-walled bushes used in plain-bearing assemblies.

Q: What does it cover?

A: It covers three primary measurement approaches—circumferential line measurement, axial line measurement and point measurement—along with requirements for measuring instruments and procedures to obtain reliable wall-thickness data for metallic thin-walled bearings; it excludes thermoplastic bushes.

Q: Who typically uses it?

A: Bearing manufacturers, component suppliers, metrology and QC laboratories, design and manufacturing engineers involved with plain bearings, and conformity assessment bodies use the standard for production inspection and dimensional verification.

Q: Is it current or superseded?

A: ISO 12306:1994 has been withdrawn. Related and subsequent standards addressing plain-bearing measurement and specification needs include ISO 3547-7:2007 and ISO 3548-2:2009, which serve as later references in this subject area.

Q: Is it part of a series?

A: It relates to other plain-bearing standards and measurement/checking principles (for example ISO 12301) and was developed under ISO/TC 123 (subcommittee SC 5 dealing with plain bearings), forming part of the body of standards for plain-bearing dimensions and inspection methods.

Q: What are the key keywords?

A: plain bearing; half-bearing; bush; wall thickness; measurement; metrology; inspection; thin-walled; bearing manufacturing; ISO 12306.