JB/T 1308.11-1999 JB/T 1308.11-1999 PN250a Internal and external threaded sleeve types, dimensions and technical requirements JB/T1308.11-1999 Standard download decompression password: www.bzxz.net

ICS23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1~1308.21-1999
PN250MPa ultrahigh pressure valves and fittings
Published on July 12, 1999
National Bureau of Machinery Industry
Implementation on January 1, 2000
Machinery Industry Standard of the People's Republic of China
PN250MPa.Inner and outer nuts
Type, dimensions and specifications of PN250MPa inner and outer nuts This standard specifies the types, dimensions and technical requirements of inner and outer nuts for ultrahigh pressure valves. JB/T1308.11-1999
Replaces JB1318-73
This standard applies to internal and external threaded sleeves for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. 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/T 196—1981
GB/T 197---1981
GB/T6991988
GB/T18041992
Basic dimensions of ordinary threads (diameter 1~600mm)Tolerances and fits of ordinary threads (diameter 1~355mm)Technical conditions for high-quality carbon steel
General tolerancesUnspecified tolerances for linear dimensions
JB/T1308.2—1999PN250MPaTechnical conditions for valves, fittings and fasteners 3 Structural types and dimensions
3.1 The types of internal and external threaded sleeves shall be as specified in Figure 1. The rest
O8 grade A-
National Machinery Industry Bureau approved R on July 12, 1999
2000-01-01 implementation
The dimensions of the inner and outer thread sleeves shall be in accordance with the provisions of Table 1.
Nominal diameterbzxz.net
Technical requirements
Thread code
M60×3-6g
M72×36g
M90×36g
Metal grain code
JB/T1308.11-1999
M33×2left-6H
M48×2left-6H
M60×3left-6H
Inner and outer thread sleeves are made of 25# steel, and the technical requirements shall be in accordance with the provisions of GB/T699. 4.1
The basic dimensions of the thread shall comply with the provisions of GB/T196, and the tolerances shall comply with the 6g or 6H grade accuracy specified in GB/T197. 4.2
4.3 The tolerances of the machining dimensions not specified shall comply with the provisions of GB/T1804. 4.4 Measures shall be taken to prevent biting on the threaded part. 4.5 Other technical requirements shall comply with the provisions of JB/T1308.2. 5
Marking example
Inner and outer threaded sleeves with a nominal diameter of 15mm:
Inner and outer threaded sleeves DN15JB/T1308.11—1999D
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