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
4
30H
Marking example:
L
DI≥0.95SbzxZ.net
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
M14x1.5
d.
4
d3
4
8
7
11
M18x 1.51
9| |tt||(M20×1.5)(12)(10)
M22×1.5114
12
(M24 ×1.5)
(16(13)| |tt||M27×2
M33×2
M42×2
M48×2
18
22
28| |tt||31
14
14
17
20
2
2
2||tt ||2
4
H
6
7
8
9
to
12
14
18
4
JB 999—77
mm
S
Nominal dimensional tolerance|| tt||L
25
28
17
19
24
(27)
30|| tt||(32)
36
41
55
60
Note: Dimensions in () are limited to technical conditions for agricultural machinery pipe joints. According to the regulations of JB1003~—77 -0.24
-0.28
30
32
35
32
L1||tt ||35
11
42
38
40
45
48
48
50
60
55
60
- 0.34 + 70
65
70
75||tt| |75
85
-0.40
95
14
(16)
17
(19)| |tt||21
17
21
Total 2 assets No. 2
IL3La
L2
119||tt| |22
11
14
16
(17)
18
(19
20||tt ||19121
24
241
28
22
25
24
26
29
25
28
35
30
32
37
40
39| |tt||41
51
43
48
58
57
62
67||tt ||65
75
83
D
19.610.5
21.91 0.8
27.9
0.8|| tt||(31.2)
34.6
(36.9)
41.6
1
1.2
47.31.2||tt| |63.5
1.2
69.3
115
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