This standard specifies the structural type, dimensions and technical requirements of threaded stem nuts. JB/T 1699-1991 Stem Nuts (IV) JB/T1699-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T1699-1991
Stem Nut
1991-07-23 Issued
Ministry of Machinery and Electronics Industry
(IV)
1992-07-01 Implementation
Mechanical Industry Standard of the People's Republic of China
Stem Nut
1 Subject Content and Scope of Application
(IV)
This standard specifies the structural type, size and technical requirements of threaded stem nuts. This standard applies to gray cast iron gate valves with nominal pressure p1.0MPa and nominal diameter D/50~450mm. 2
Cited standards
GB 1176
GB1804
GB5796.1~5796.4
3Types and dimensions
Basic dimensions of ordinary threads (diameter 1~600mm)Tolerances and fits of ordinary threads (diameter 1~355mm)Cast copper alloy
Tolerances and fits
Limit deviations of dimensions without tolerances
Trapezoidal thread
The structural type of stem nut (IV) is shown in the figure, and the dimensions are as specified in the table. JB/T1699-1991
Replaces JB1699-75
Approved by the Ministry of Machinery and Electronics Industry on July 23, 1991, cb quality (calculated density 8.5)
Implemented on July 1, 1992
Tr18× 4LH—7H
Tr20× 4LH—7H
Tr24x5LH7H
Tr28x5LH—7H
Tr36× 6LH—7HwwW.bzxz.Net
Tr44x8LH—7H
4Technical requirements
M30×2
M39×2
M27x2 left
M30×2 left
M36×2 left
M42×2 left
M52×2 left
M64x2 left
JB/T1699-1991
4.1The material is ZHMn58—2—2, and the technical requirements are in accordance with GB1176. 24
4.2The dimensions of ordinary threads are in accordance with GB196, and the tolerances are in accordance with GB197. 4.3The dimensions and tolerances of trapezoidal threads are in accordance with GB5796.1~5796.4. 4.4 The tolerance grade of dimensions without tolerance shall be IT14 as 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. 20
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 Jing. 2
People's Republic of China
Mechanical Industry Standard
Stem Nut
(IV)
JB/T1699-1991
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 Printing in January 1993
First Edition in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661 - 6691 1/2F
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