GB/T 971-2008thread rolling cylindrical dies (English PDF)

Foreword

This standard replaces GB/T 971-1994 "rolling wheel."

The standards and GB/T 971-1994 difference compared to the following.

--- Increasing the foreword;

--- Deleted 3.4 Note (1), note (2), (3) Note contents.

The standard proposed by China Machinery Industry Federation.

This standard tool by the National Standardization Technical Committee (SAC/TC91) centralized.

1 Scope

This standard specifies the basic requirements common thread with roller type wire wheels, dimensions and tolerances, technical requirements, marking and packaging and the like.

This standard applies to the processing of common screw (GB/T 192 ~ 193, GB/T 196 ~ 197) of the rolling wheel. Rolling wheel is divided into three accuracy Level. Level 1, Level 2 and Level 3. Level 1 is for processing tolerance class 4, 5 of the external thread; Level 2 is suitable for machining tolerance class 5, 6 external threads; Level 3 is suitable for machining tolerance class 6, 7 of the external thread.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 192 ordinary screw threads - Basic model (GB/T 192-2003, ISO 68-1:1998, MOD)

GB/T 193 series ordinary thread diameter and pitch (GB/T 193-2003, ISO 261:1998, MOD)

GB/T 196 common thread basic size (GB/T 196-2003, ISO 724:1993, MOD)

GB/T 197 common thread tolerance (GB/T 197-2003, ISO 965-1:1998, MOD)

3 Rolling wheel types and dimensions