This standard specifies the type, size, and technical requirements of nuts for forged high-pressure valves. This standard applies to nuts with a nominal pressure of pN16.0~32.0MPa. JB/T 2775-1992 PN16.0～32.0MPa nuts JB/T2775-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
PN16.0~~32.0MPa Nut
Subject Content and Scope of Application
This standard specifies the type, size, technical requirements, etc. of nuts for forged high-pressure valves. This standard applies to nuts with a nominal pressure of PN16.(~32.0MPa. 2 Reference StandardsbZxz.net
Fastener Acceptance Inspection, Marking and Packaging
Basic Dimensions of Ordinary Threads
Tolerances and Fits of Ordinary Threads
Technical Conditions for High-Quality Carbon Structural Steel
GB3077
JB/T 450
Technical conditions for alloy structural steel
Technical conditions for PN16.0～32.0MPa forged angle high-pressure valves, pipe fittings and fasteners 3 Structural types and dimensions
The type of nut shall be as specified in Figure 1.
Marking example
Coarse pitch ordinary thread, nut with a diameter of 27mm: nut M27 JB/T2775
3.2 The dimensions of the screw shall be as specified in Table 1.
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 20, 1992
J/T 2775
Replace B2777
199301-01 implementation
Thread code
Technical requirements
4.1 Material
Nominal size
Limit deviation
.--0.31
JB/T2775
Nominal size
Limit deviation
The material of the nut shall be as specified in Table 2. The material may be forged or rolled. Table 2
The mechanical properties of the nut after heat treatment shall be as specified in Table 3 Table 3
GB 699
GR 3077
The basic dimensions of the thread shall comply with the provisions of GB196, and the common tolerance shall comply with the provisions of GB197. The nuts shall be chemically treated to prevent atmospheric corrosion. Inspection rules
The magnetic particle inspection results of nuts shall comply with the provisions of JB/T450. Coaxiality of screw hole to axis
179217
187229
235-27
Packaging and marking
JB/T 2775
The packaging and marking of nuts shall comply with the provisions of GB90. Additional remarks:
This standard was proposed and attributed to the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Huang Mingya and Shi Xiaogou. 112
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