This standard specifies the structural type, dimensions and technical requirements of threaded stem nuts. This standard is applicable to grey cast iron stop valves and throttle valves with nominal pressure pN1.6MPa and nominal diameter DN25~65mm. JB/T 1694-1991 Stem Nuts (I) JB/T1694-1991 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T1694-1991
Stem Nut
Published on July 23, 1991
Ministry of Machinery and Electronics Industry
Implementation on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Subject Content and Scope of Application
This standard specifies the structural type, dimensions and technical requirements for lower threaded stem nuts. JB/T 1694-1991
Replaces JB1694-75
This standard applies to gray cast iron stop valves and throttle valves with a nominal pressure of pxl.6MPa and a nominal diameter of D25~65mm. Cited standards
GB1176
GB1804
GB5796.1~5796.4bzxz.net
Types and dimensions
Cast copper alloy
Basic dimensions of ordinary threads (diameter 1~600mm) Tolerances and fits of ordinary threads (diameter 1~355mm) Tolerances and fits Limit deviations of dimensions without tolerances Trapezoidal threads
The structural type of stem nut (I) is shown in the figure, and the dimensions are as specified in the table. Grade 10A
cx45°
2×45°
Tr14×3—7H
Tr18×4—7H
Tr20×4—7H
M24×2
M27×2
M30×2
Approved by the Ministry of Machinery and Electronics Industry on July 23, 1991 L
The rest of the dream
Quality (calculated density 8.5)
Implemented on July 1, 1992
Technical requirements
JB/T1694-1991
The material is ZHMn58—2—2, and the technical requirements are in accordance with the provisions of GB1176 4.1
The dimensions of ordinary threads are in accordance with the provisions of GB196, and the tolerances are in accordance with the provisions of GB197. 4.2
4.3 The dimensions and tolerances of trapezoidal threads shall comply with the provisions of GB5796.1~5796.4.4 The tolerance grade of dimensions without tolerance shall comply with IT14 specified in GB1804. Additional remarks:
This standard was proposed and managed by 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 and the Beijing Valve Research Institute. The main drafters of this standard are Zhang Huayou, Hong Miancheng, Lu Peiwen and Wang Jingxin. 2
Democratic Communist Party:
Mechanical Industry Standard
Rod Nut
JB/T 16941991
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/8
Word Count 4,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1616
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