JB/T 7912-1999 This standard is equivalent to ISO 262:1973 "ISO metric common thread - selection series for screws, bolts and nuts". This standard is a revision of JB/T 7912-95 "selection series for common threads of commercial fasteners". This standard specifies the selection series of common threads for commercial fasteners with a nominal diameter of 1 to 39 mm. The recommended series within the range of nominal diameter 42 to 68 mm is shown in Appendix A of this standard. This standard applies to common threads of commercial fasteners. For common thread series, see GB/T 193-1981 "common thread diameter and pitch series (diameter 1 to 600 mm)". This standard was first issued in 1988 as GB 9144-88 and was adjusted to JB/T 7912-95 on April 14, 1996. JB/T 7912-1999 Common thread selection series for commercial fasteners JB/T7912-1999 Standard download decompression password: www.bzxz.net

ICS 21.040.10
Machinery Industry Standard of the People's Republic of China
JB/T7912-1999
eqvISO262：1973
General purpose screw threads Selected sizes for commercial screws,bolts and nutsPublished on 1999-06-24
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T7912-1999
This standard is equivalent to ISO262:1973 "Selected sizes for 1SO metric general purpose screws, bolts and nuts". This standard is a revision of JB/T7912-95 "Selected sizes for general purpose screw threads for commercial fasteners". During the revision, only editorial changes were made according to relevant regulations, and there was no change in the main technical content. This standard replaces JB/T7912-95 from the date of implementation. Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the National Technical Committee for Thread Standardization. The drafting unit of this standard: Mechanical Science Research Institute. The main drafter of this standard: Li Xiaobin.
This standard was first issued in 1988 as GB9144-88 and was adjusted to JB/T7912-95 on April 14, 1996. Scope
Standard of the Machinery Industry of the People's Republic of China
Selected series of general purpose serew threads for commercial fasteners General purpose serew threads Selected sizes for commercial screws, bolts and nuts JB/T7912—1999
eqvIso2621973
Replaces JB/T7912—95
This standard specifies the selected series of general purpose serew threads for commercial fasteners with a nominal diameter of 1~39mm. The recommended series within the range of nominal diameter 42~68mm is shown in Appendix A (Suggested Appendix). This standard applies to general purpose threads for commercial fasteners. For general purpose thread series, see the provisions of GB/T1931981. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T193—1981 Ordinary thread diameter and pitch series (diameter 1~600mm) Diameter and pitch series
Diameter and pitch series shall be in accordance with the provisions of Table 1.
Diameter and pitch series
Nominal diameter
First series
Approved by the State Machinery Industry Bureau on 1999-06-24 Second series
Implemented on 2000-01-01www.bzxz.net
First series
Nominal diameter
Selection of diameter and pitch
JB/T7912—1999
Second series
(End)
Thread diameter should be selected first series, and the second series should be used as little as possible. The pitch in brackets should be used as little as possible.
1.5(1.25)
JB/T79121999
Appendix A
(Suggested Appendix)
Preferred series of ordinary threads with nominal diameters of 42 to 68 mm This appendix specifies the preferred series of ordinary threads with nominal diameters of 42 to 68 mm. The diameter and pitch series are shown in Table A1. Table A1 Preferred diameter and pitch series
Nominal diameter
First series
Second series
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