This standard specifies the size series of square holes for clutch wheels used in watches. This standard applies to square holes for clutch wheels used in watches. QB/T 2312-1997 Size series of square holes for clutch wheels used in watches QB/T2312-1997 Standard download decompression password: www.bzxz.net

QB/T2312-1997
This standard is revised based on the original national standard GB4041-1983 "Square Hole Size Series for Clutch Wheels of Watches". During the revision process, the relevant technical elements were adjusted and modified, and the format, structure and content of the standard were rearranged. The main differences between this standard and the original standard GB4041-1983 are: Unit 1: Drafting and Expression Rules of Standards
—The writing format and expression method shall be implemented in accordance with GB/T1.11993 Guidelines for Standardization Work Part 1: Basic Regulations for Standard Writing: Chapter 2 Reference Standards is added,
Some adjustments have been made to the size series in Chapter 4. This standard was proposed by the Quality Standards Department of the China Light Industry Federation. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. The drafting unit of this standard: Dandong Watch Industry Company. The main drafters of this standard: Su Sheng and Sheng Xiaohua. This standard will replace GB4041-1983 from the date of implementation. 104
1 Scope
Light Industry Standards of the People's Republic of China
Square hole size series for watch clutch wheels
This standard specifies the size series of square holes for clutch wheels used in watches. This standard applies to square holes for clutch wheels used in watches. 2 Reference standards
QB/T 2312—1997www.bzxz.net
The following standards contain clauses that constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1803—1979 Tolerances and fit dimensions to 18mm holes and shaft tolerance zones 3 Structural types
A-square diagonal; C-square side length: D-reducing hole diameter Figure 1
4 Dimensions Series and tolerance
4.1 See Table 1 for dimension series.
Approved by China Light Industry Association on September 1, 1997
Implemented on May 1, 1998
QB/T23121997
Table 1 (end)
The tolerance zone code (see Table 2) and its upper and lower deviations of each dimension shall be implemented in accordance with GB/T1803. 4.2
Purchase number
Tolerance zone code
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