JB/T 1700.2-1991 Locking nuts (II)

This standard specifies the structural type, dimensions and technical requirements of locking nuts (II) for valve stem nuts. JB/T 1700.2-1991 Locking nuts (II) JB/T1700.2-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Lock nut
Subject content and scope of application
This standard specifies the structural type, dimensions and technical requirements of lock nuts (II) for valve stem nuts. This standard is applicable to cast steel gate nuts with nominal pressure of 1.6~6.4MPa and nominal diameter D50~300mm. 2 Reference standardswww.bzxz.net
GB1804
3 Types and dimensions
Basic dimensions of ordinary threads (diameter 1~600mm) Tolerances and fits of ordinary threads (diameter 1~355mm) Technical conditions for high-quality carbon structural steel
Tolerances and fits Limit deviations of dimensions without tolerance The structural type of lock nuts (II) is shown in the figure, and the dimensions are as specified in the table. Approved by the Ministry of Machinery and Electronics Industry on July 23, 199130
JB 1700. 2--91
Implemented on July 1, 1992
Valve stem thread diameter
M56×2
M65×2
M65×2
Technical requirements
JB1700.2—91
Material is 35, technical requirements are in accordance with GB699. B
Ordinary thread size is in accordance with GB196, tolerance is in accordance with GB197. Tolerance of dimensions without tolerance is in accordance with IT14 specified in GB1804.4.3
Additional remarks:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. 6
This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry and the Beijing Valve Research Institute. The main drafters of this standard are Lu Peiwen, Zhang Huayou, Hong Miancheng, and Wang Jingxin. 0.8
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