BS ISO 4379:2018 pdf download

BS ISO 4379:2018 pdf download.Plain bearings — Copper alloy bushes
1 Scope
This document specifies dimensions and tolerances for cylindrical and flanged bushes with internal diameter, d 1 , in the range 6 mm to 200 mm.
It applies to solid mono‑metal copper alloy bushes to be used as plain bearings with and without oil holes and oil grooves.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product documentation
ISO 2768‑1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications
ISO 4382‑1, Plain bearings — Copper alloys — Part 1: Cast copper alloys for solid and multilayer thick-walled plain bearings
ISO 4382‑2, Plain bearings — Copper alloys — Part 2: Wrought copper alloys for solid plain bearings
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Dimensions and tolerances
Dimensions shall be as shown and given in Figure 1 and in Table 1 and Table 2.
Tolerances shall be as given in Table 3.
Tolerance classes which deviate from those given in this document shall in each case be added in the designation to the nominal size.
The dimensions of d 2 shall be used to determine the IT value in the case of the coaxial tolerance.
The dimensions of d 3 shall be used to determine the IT value in the case of the axial runout.
Details which have not been specified shall be chosen appropriately.
7 Construction
Permissible deviations for dimensions without tolerance indication shall be in accordance with tolerance class “m” as specified in ISO 2768‑1.
For outside chamfer c 2 of 45°, no special designation details are required.
For outside chamfer c 2 of 15°, Y shall be additionally specified in the designation.
Other chamfers shall be agreed between the manufacturer and customer.
Flange bushes type F with or without undercut (dimension u) shall be agreed between the manufacturer and customer.
The tolerance classes recommended in this document are applicable to any normal applications in general machinery construction. The fits recommended in this document should be checked in the case of bushes used in the area of hydrodynamic lubrication, or pressed or bonded in housings which are unusual as regards both material and design.
8 Quality assurance
For quality control techniques and inspection of the geometrical and material quality characteristics,see ISO 12301.