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ISO 12129-1

1st Edition, 1995

Complete Document

Plain Bearings - Part 1: Fits

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ISO 12129-2

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Description / Abstract:

This part of ISO 12129 specifies a system of fits applicable to metallic plain bearings used in general engineering for mean relative bearing clearances ψm of 0,56 ‰up to 3,15 ‰.

This system of fits is not applicable to half‑bearings and bushes which, due to their special characteristics, are not measured by diameter but by wall thickness, and which are dimensionally changed on assembly. It is not applicable to profile bore or tilting pad bearings, or to cases where specific tolerances have been established by consideration of the bearing performance at both extremes of clearance.

This part of ISO 12129 is applicable preferably to rotating machine parts and shafting, but it may be used similarly in other ranges of application.

This part of ISO 12129 has been established because it is not possible to use the ISO deviations given in ISO 286-1 and ISO 286-2 to develop clearance fits which correspond to the requirements of plain bearing engineering for approximately uniform mean relative bearing clearances for all nominal size ranges.

Other clearance ranges may be used depending upon the requirements in specific applications
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