JB/T 8921-1999 Rolling bearings and commercial parts - Inspection rules
1 Scope
This standard specifies the inspection rules for rolling bearings and commercial parts (steel balls, needle rollers, cylindrical and conical rollers, accessories), and the sampling method meets the requirements of GB/T 2828.
This standard is applicable to the final inspection and acceptance of rolling bearings and commercial parts by the quality departments and clients of manufacturer.
2 Normative references
The following standards contain provision which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions cited are valid. All standards are subject to revision, and all parties using this standard are encouraged to investigate the possibility of applying the latest editions of the following standards.
GB 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
JB/T 1255-1991 Rolling bearings - Parts made from heat-carbon chromium bearing steels - Specifications for heat treatment
3 Definitions and symbols
Δds: single internal diameter deviation
Δdmp: average inner diameter deviation of a single radial plane (only refers to the theoretical small end of the inner pore for conical pore bearings)
