JB/T 1308.16-1999 JB/T 1308.16-1999 PN250a Nut types, dimensions and technical requirements JB/T1308.16-1999 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 ultra-high pressure valves and fittings
Technical conditions
SpecificationsforPN250MPaUltrahighpressurevalvesandfittings
Published on July 12, 1999
State Machinery Industry Bureau
Implementation on January 1, 2000
1 Scope
Machinery Industry Standard of the People's Republic of China
PN250MPa nuts
Type, dimensions and technical conditions
specificationsofPN250MPanuts
This standard specifies the types, dimensions and technical requirements of nuts for ultra-high pressure valves. This standard is applicable to nuts for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. Referenced standards
JB/T1308.16—1999
Replaces JB1323—73
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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 90—1985
GB/T 196-1981
GB/T 197—1981
GB/T 3077—1988
GB/T3098.2—1982
JB/T1308.2—1999
3.Structural types and dimensions
Acceptance inspection, marking and packaging of fasteners
Basic dimensions of ordinary threads (diameter 1~600mm)Tolerances and fits of ordinary threads (diameter 1~355mm)Technical conditions for alloy structural steels
Mechanical properties of fastenersNuts
PN250MPaTechnical conditions for valves, pipe fittings and fasteners3.1 The types of nuts shall be as specified in Figure 1.
Other departments
Approved by the State Machinery Industry Bureau on July 12, 199934
Implemented on January 1, 2000bzxz.net
The dimensions of the nut shall be in accordance with the provisions of Table 1.
Thread code
Technical requirements
JB/T1308.16-1999
Material of the nut is 35CrMoA, technical requirements shall be in accordance with the provisions of GB/T30774.2
Hardness after heat treatment is HB-248~302.
Deviation of the center line of the screw hole
4.3The basic dimensions of the thread shall be in accordance with the provisions of GB/T196, and the tolerance shall be in accordance with the 6H grade accuracy specified in GB/T197. 4.4The nut shall be chemically treated to prevent atmospheric corrosion. 4.5Acceptance rules, packaging and marking shall be in accordance with the provisions of GB/T90. 4.6 Other technical requirements shall be in accordance with the provisions of GB/T3098.2 for refined products and JB/T1308.2. 5 Marking example
Nuts with coarse thread and ordinary thread diameter 24mm: Nut M24JB/T1308.16~-1999
Weight per 1000 pieces
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