JB/T 999-1977 Hinged bolts for pipe joints

This standard only specifies the hinge bolts for welding, ferrule and flared pipe joints. JB/T 999-1977 Hinged bolts for pipe joints JB/T999-1977 Standard download decompression password: www.bzxz.net

Ministry of Machinery Industry of the People's Republic of China
Ministry Standard
Hinged Bolts for Pipe Joints
This standard only specifies hinge bolts for welding, ferrules, and flared pipe joints. -da90° cross uniform distribution
Marking example:
DI≥0.95S
Thread diameter d22mm, Hinge bolt with pitch 1.5mm and length 48mm: Bolt M22×1.5×48JB999--77
The First Ministry of Machinery Industry of the People's Republic of China issued the Standardization Research Institute of the First Ministry of Machinery Industry and proposed 6
JB 999 —77
Replacing JB999-67
The remaining 3
Implemented on May 1, 1977
Drafted by Jinan Casting and Pressure Machinery Research Institute and others d
M10x1
M18x 1.51
9| |tt||(M20×1.5)(12)(10)
M22×1.5114www.bzxz.net
(M24 ×1.5)
(16(13)| |tt||M27×2
M33×2
M42×2
M48×2
28| |tt||31
2||tt ||2
JB 999—77
Nominal dimensional tolerance|| tt||L
30|| tt||(32)
Note: Dimensions in () are limited to technical conditions for agricultural machinery pipe joints. According to the regulations of JB1003~—77 -0.24
L1||tt ||35
- 0.34 + 70
75||tt| |75
(19)| |tt||21
Total 2 assets No. 2
119||tt| |22
20||tt ||19121
39| |tt||41
67||tt ||65
21.91 0.8
0.8|| tt||(31.2)
47.31.2||tt| |63.5
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