Overview
ISO 3547-1:2018 - Plain bearings - Wrapped bushes - Part 1: Dimensions specifies the dimensional system, designations and tolerancing principles for cylindrical and flanged wrapped bushes made from mono- and multi‑layer bearing materials. It is the third edition (2018) of the standard and defines how wrapped bushes are sized, checked (e.g., ring gauge testing), and documented for plain bearing applications.
Key topics and technical requirements
- Scope and materials: Applies to wrapped bushes (cylindrical and flanged) made from single- or multi-layer bearing materials for plain bearings.
- Dimensional tables: Preferred nominal dimensions and tolerances for inside diameter, outside diameter, wall thickness, bush width and flange geometry are provided in detailed tables.
- Wall thickness and inside diameter: Methods for specifying either wall thickness or inside diameter are given (but not both simultaneously); wall‑thickness tolerance series (A–E) and Series W (machined bores) are defined.
- Ring gauge testing: The standard references gauging (Test C in ISO 3547-2) and gives tolerances for the bush inside diameter when checked in a ring gauge (Series W).
- Housing bore and press‑fit: Rules to derive minimum/maximum inside diameters from housing bore and wall thickness are included. A formula and guidance for calculating housing bore expansion due to pressing-in of the bush are added in this edition.
- Chamfers and radii: Recommended outside and inside chamfers, and flange radii, including machined vs rolled edge options.
- Design guidance: Notes on butt-joint types, allowable distortion from wrapping, machining allowances, lubrication holes/grooves/indents and finish requirements (no loose burrs).
- Inspection and tolerances: Concentricity guidance and recommended tolerance classes for housing bores (e.g., H6/H7 ranges) are included, plus reference to quality-control methods.
Practical applications and users
ISO 3547-1 is used to:
- Specify wrapped bush dimensions and tolerances for engineering drawings and procurement.
- Guide manufacturers in producing standard cylindrical and flanged wrapped bushes.
- Support quality inspectors and laboratory testing (gauging, dimensional inspection).
- Help designers and OEMs ensure correct press‑fit, bore tolerances and assembly performance in rotating machinery, automotive components, industrial gearboxes, pumps and other plain bearing applications.
Typical users: bearing manufacturers, component designers, procurement engineers, maintenance teams and test laboratories.
Related standards
Keywords: ISO 3547-1, wrapped bushes, plain bearings, dimensions, tolerances, ring gauge, wall thickness, press-fit, housing bore, flanged bush, bearing material.