This standard applies to gas turbine power plants. JB/T 6686-1993 12-point flange bolts JB/T6686-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 6686-1993
12 Angle Head Flange Face Bolts
Published on 1993-06-01
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-01-01
Machinery Industry Standard of the People's Republic of China
12 Angle Head Flange Face Bolts
This standard applies to gas turbine power units 130°
0.2×45°
Note: d is the diameter of the chamfer circle.
Marking:
JB/T6686-1993
Thread specification d=M16,
Bolt length=100mm,
Marking example of 12-angle head flange bolt made of 30CrMnSi Bolt
JB/T6686-93-M16X100·30CrMnSi Table 1
Thread specification d
Basic dimensions
Mechanical Approved by the Ministry of Industry on June 1, 1993
Implementation on January 1, 1994
Thread specification d
Thread specification d
Basic dimensions
Thread specification d
Basic dimensions
JB/T6686-1993
Continued Table 1
(M22）
Technical conditions shall be in accordance with the provisions of JB/T6688-
3-1993.
(M45）
Basic size
JB/T6686—1993
Specification d
b (not including screw tail)
(M18）
Basic size
JB/T6686-1993
Continued Table 2
Thread specification d
(M22)M24(M27)
Note: ①People
Try not to use the specifications in brackets.
(M33)M36(M39)bzxZ.net
b (not including screw tail)
M48(M52)
②For bolts with b values ​​above the dotted line in the table, all threads are made on the screw, and the total length of the thread end plus the thread blank shall not be greater than two pitches. ③ For the bolts below the dotted line in the table, the value of b is the thread length, and its size is bPmm. 4
JB/T 6686-1993
Thread specification
Weight of every 1000 steel bolts
Thread specification
Weight of every 1000 steel bolts
JB/T6686-1993
Continued Table 3
Thread specification
Weight of every 1000 steel bolts
(M45)
Weight of every 1000 steel bolts
Note: The specifications in brackets should not be used as much as possible. Additional remarks:
This standard is proposed by Nanjing Gas Turbine Research Institute. This standard is under the jurisdiction of Nanjing Gas Turbine Research Institute. JB/T6686-1993
Continued Table 3
Thread specification
Weight of each 1000 steel bolts kg
Thread gauge
Weight of each 1000 steel bolts
This standard was drafted by Nanjing Steam Turbine and Electric Machine Factory, Nanjing Gas Turbine Research Institute, Harbin Steam Turbine Factory, and the 703rd Research Institute of China State Shipbuilding Corporation.
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