ISO 12128:2020 PDF

Plain bearings — Lubrication holes, grooves and pockets — Dimensions, types, designation and their application to bearing bushes

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Title (English):

ISO 12128:2020

Plain bearings — Lubrication holes, grooves and pockets — Dimensions, types, designation and their application to bearing bushes

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: April 30, 2020
Edition:: ISO IS 12128 edition 3 version 1
ICS:: 21.100.10

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Description (English):

This document specifies dimensions for lubrication holes, grooves and pockets for bearing bushes. These dimensions can be entered, for example on drawings, using the designation examples. Their use depends in particular on the specific operating conditions. In addition, it enables the user to assign the different types of lubricant feed and distribution to solid and steel-backed plain bearing bushes made of copper alloys, aluminium alloys, thermosetting plastics, thermoplastics or artificial carbon. NOTE Different types of lubricant feed and distribution for plain bearing bushes made of sintered metals have not been specified due to the fact that these bushes are soaked with lubricant. Plain bearing bushes made of artificial carbon are not lubricated with oil or grease.

Technical details

Technical committee: ISO/TC 123/SC 3 - Dimensions, tolerances and construction details
SKU: ISO 12128:2020

Abstract

Overview

ISO 12128:2020 - Plain bearings: lubrication holes, grooves and pockets - specifies standardized dimensions, types, designation and application rules for lubrication features in plain bearing bushes. The standard covers lubrication holes, longitudinal/circumferential grooves and lubrication pockets for solid and steel-backed plain bearing bushes made of copper alloys, aluminium alloys, thermosetting plastics, thermoplastics and artificial carbon. It clarifies how to indicate these features on drawings and how to assign lubricant feed and distribution types to common bush materials. (Sintered-metal bushes are excluded because they are typically soaked with lubricant; artificial carbon is not lubricated with oil or grease.)

Key topics and requirements

Dimensioning basis: Lubrication feature dimensions are given relative to the bearing wall thickness (s); the diameter (d) is an auxiliary dimension.
Lubrication holes: Defined types (e.g., A, B, L) with recommended sizes and designation examples (e.g., “Lubrication hole ISO 12128 – A3”).
Lubrication grooves: Multiple groove types (C, D, E, F, G, H, J, etc.) with depth, width and shape guidance; closed-end and open-end variants are specified and labelled (example designation: “Lubrication groove ISO 12128 – D0,8”).
Lubrication pockets: Type K pockets for larger lubrication reservoirs; pocket dimensions and designation (example: “Lubrication pocket ISO 12128 – K2,5”).
Design rules:
- Avoid placing holes/grooves in highly stressed zones.
- Grooves/pockets generally should not extend the full bearing length (except artificial carbon exceptions).
- Edges chamfered to max 0.5 mm or rounded; avoid sharp transitions.
- Permissible deviations use tolerance class “c” per ISO 2768‑1.
- For multiple holes, standard angular spacing applies (2 holes = 180°, 3 = 120°, 4 = 90°).
Designation on drawings: The standard provides concise designation formats and examples for bushes incorporating these features and how symbols x (distance from insert side) and h (groove pitch) are used.

Applications and users

ISO 12128:2020 is directly useful for:

Mechanical and design engineers specifying bearing bushes
OEMs and machine designers requiring reliable lubricant feed solutions
Bearing manufacturers and machine shop drawing authors
Maintenance engineers selecting or replacing plain bearings
Technical drafters preparing ISO-compliant drawings

Practical uses include designing lubrication paths for journal bearings, slideways and bushings in engines, pumps, construction equipment and industrial machinery where controlled lubricant feed and retention are required.

Related standards

ISO 4379 (Copper alloy bushes) - often used together for material/dimension specs
ISO 4383 (Multilayer materials for thin-walled plain bearings)

Keywords: ISO 12128:2020, plain bearings, lubrication holes, lubrication grooves, lubrication pockets, bearing bushes, bearing wall thickness, lubrication designation.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Dimensioning basis: Lubrication feature dimensions are given relative to the bearing wall thickness (s); the diameter (d) is an auxiliary dimension.
Lubrication holes: Defined types (e.g., A, B, L) with recommended sizes and designation examples (e.g., “Lubrication hole ISO 12128 – A3”).
Lubrication grooves: Multiple groove types (C, D, E, F, G, H, J, etc.) with depth, width and shape guidance; closed-end and open-end variants are specified and labelled (example designation: “Lubrication groove ISO 12128 – D0,8”).
Lubrication pockets: Type K pockets for larger lubrication reservoirs; pocket dimensions and designation (example: “Lubrication pocket ISO 12128 – K2,5”).
Design rules:
- Avoid placing holes/grooves in highly stressed zones.
- Grooves/pockets generally should not extend the full bearing length (except artificial carbon exceptions).
- Edges chamfered to max 0.5 mm or rounded; avoid sharp transitions.
- Permissible deviations use tolerance class “c” per ISO 2768‑1.
- For multiple holes, standard angular spacing applies (2 holes = 180°, 3 = 120°, 4 = 90°).
Designation on drawings: The standard provides concise designation formats and examples for bushes incorporating these features and how symbols x (distance from insert side) and h (groove pitch) are used.

Applications and users

ISO 12128:2020 is directly useful for:

Mechanical and design engineers specifying bearing bushes
OEMs and machine designers requiring reliable lubricant feed solutions
Bearing manufacturers and machine shop drawing authors
Maintenance engineers selecting or replacing plain bearings
Technical drafters preparing ISO-compliant drawings

Related standards

ISO 4379 (Copper alloy bushes) - often used together for material/dimension specs
ISO 4383 (Multilayer materials for thin-walled plain bearings)

Keywords: ISO 12128:2020, plain bearings, lubrication holes, lubrication grooves, lubrication pockets, bearing bushes, bearing wall thickness, lubrication designation.

ISO 12128:2020 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Plain bearings - Lubrication holes, grooves and pockets - Dimensions, types, designation and their applicatio…

General tolerances -- Part 1: Tolerances for linear and angular dimensions without individual tolerance indic…

Plain bearings - Copper alloy bushes

Plain bearings - Multilayer materials for thin-walled plain bearings