This standard specifies the structural type, dimensions and technical requirements of threaded stem nuts. This standard applies to gray cast iron stop valves with nominal pressure pN1.6MPa and nominal diameter DN80~150mm; ductile iron and cast and forged steel stop valves and throttle valves with nominal pressure pN1.6~16MPa and nominal diameter DN15~150mm; and forged steel gate valves with nominal pressure pN4.0 and 16MPa and nominal diameter DN15~40mm. JB/T 1695-1991 Stem Nuts (II) JB/T1695-1991 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T1695-1991
Stem Nuts
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 Chinawww.bzxz.net
Subject Content and Scope of Application
This standard specifies the structural type, size and technical requirements for threaded stem nuts. JB/T1695-1991
Replaces JB1695-75
This standard applies to gray cast iron stop valves with nominal pressure Pn1.6MPa and nominal diameter Dz80~150mm; ductile iron and cast and forged steel stop valves and throttle valves with nominal pressure Px1.6~16MPa and nominal diameter Dv15~150mm; and forged steel gate valves with nominal pressure Px4.0 and 16MPa and nominal diameter D%15~40mm.
2 Reference standards
GB1176
GB1804
GB5796.1~5796.4
3 Types and sizes
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 (II) is shown in the figure, and the dimensions are as specified in the table. 12-5/
Approved by the Ministry of Machinery and Electronics Industry on July 23, 1991C;x55
Implemented on July 1, 1992
Tr14X3—7H
Tr16×4—7H
Tr18X4—7H
Tr20×4—7H
Tr22×5—7H
Tr24×5—7H
Tr26×5—7H
Tr28×5—7H
Tr32×6—7H
Tr36X6—7H
Tr40×6—7H
Technical requirements
M30×2
M33×2
M36×2
M39×2
M42×2
M45×2
M48×2
M52×2
M64×3
JB/T1695-1991
Mass (calculated density 8.5)
When the material is ZQA19-4, the technical requirements are in accordance with the provisions of GB1176, applicable to ductile iron and steel stop valves, throttle valves and gate valves, and the surface roughness R of the thread (M) is 3.2um. When the material is ZHMn58-2-2, the technical requirements are in accordance with the provisions of GB1176, applicable to gray cast iron stop valves, and the surface roughness R of the thread (M) is 6.3μm. 4.2
The dimensions of ordinary threads shall comply with the provisions of GB196, and the tolerances shall comply with the provisions of GB197. The dimensions and tolerances of trapezoidal threads shall comply with the provisions of GB5796.1~5796.4. The tolerance grade of dimensions without tolerances 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. Chinese
People's Republic of China:
Mechanical Industry Standard
Stand Nut
(II)
JB/T 16951991
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
Number of Words 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.cn16169
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