GB/T 283-2021Rolling bearings—Cylindrical roller bearings—Boundary dimensions (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

This document replaces GB/T 283-2007 "Rolling bearings - Cylindrical roller bearings - Boundary dimensions". Compared with GB/T 283-2007, in addition to editorial changes, the main technical changes are as follows:

a) SUPPLEMENT the marking of dimensions Ew or Fw in some structural type drawings (see Figure 2, Figure 3, Figure 5, Figure 6);

b) ADD the dimension B1 value of reinforced NH type bearings (see Table 1 ~ Table

4);

c) EXPAND the size range of some structural types (see Table 1 ~ Table 5; Table 1 ~ Table 5 of the 2007 edition);

d) ADD the dimension dimensions of 10 series NJ type bearings (see Table 5);

e) ADD the dimension a value of some bearing models (see Table 6 and Table 8).

1 Scope

This document specifies the dimensions of cylindrical roller bearings and cylindrical roller bearings without inner rings and outer rings that comply with GB/T 273.3-2020.

This document applies to the design and user selection of cylindrical roller bearings.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 272-2017 Rolling bearings - Identification code

GB/T 274-2000 Rolling bearings - Chamfer dimension - Maximum values

GB/T 6930-2002 Rolling bearings - Vocabulary

GB/T 20060-2011 Rolling bearings - Cylindrical roller bearings, separate thrust collars - Boundary dimensions

3 Terms and definitions

The terms and definitions defined in GB/T 6930-2002 apply to this document.

4 Symbols

The following symbols apply to this document.

Unless otherwise specified, the symbols shown in Figures 1 ~ 8, the values shown in Tables 1 ~ 10, as well as Tables A.1 ~ A.9 in Appendix A, all represent nominal dimensions.

Note: Figures 1 ~ 8 are only schematic diagrams, which do not show all structural details. There are many variant structures of cylindrical roller bearings.