This standard specifies the basic tooth profile, tolerance zone position, basic dimensions and deviations of internal threads for wire thread inserts. This standard is applicable to the installation of wire thread inserts. JB/T 7604.2-1994 Internal threads for installation of wire thread inserts JB/T7604.2-1994 Standard download decompression password: www.bzxz.net

1 Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
Internal thread for installation of wire thread inserts
JB/T 7604. 2—1994
This standard specifies the basic tooth profile, tolerance zone position, basic dimensions and deviations of internal threads for wire thread inserts. This standard applies to installation of wire thread inserts.
2 Reference standards
Basic tooth profile of ordinary threads
Tolerance and fit of ordinary threads
JB/T7604.1 Types and dimensions of locking wire thread inserts 3 Basic tooth profile of threads
The basic tooth profile of threads shall be in accordance with GB192, and the position of tolerance zones shall be in accordance with the requirements of GB197, as shown in the figure. H
H=0.8660P
Basic dimensions and deviations of threads
The basic dimensions and deviations of threads shall be as specified in the following table. 5H
：0.5413P
Nominal diameter X pitch
M12×1.25www.bzxz.net
M24×2
M27×2
M30×3
M33×3
M36×3
M39×3
M42×3
M45×3
Basic size
Lower deviation
JB/T 7604.2—1994
Basic size
Upper deviation
Lower deviation
Basic size
Minor diameter D:
Upper deviation
Lower deviation
Nominal diameter×pitch
M48×3
M52×3
5Technical conditions
Major diameter D
Basic size
Lower deviation
JB/T7604.2—1994
Installation of wire thread insert
Internal thread
Middle diameter D2
Basic size
Upper deviation
Lower deviation
The deviations of each diameter of the thread are calculated from the basic thread profile line in the direction perpendicular to the thread axis. 5.2 The upper deviation of the major diameter of the thread is ensured by the forming tool. Basic size
Minor diameter D
Upper deviation
Lower deviation
5.3 The lower deviation of the thread diameter includes the size deviation of the diameter itself and the compensation value of the pitch, tooth type and half angle error; the upper deviation of the thread diameter is the deviation of the diameter itself. Check with a limit plug gauge. Thread side surface roughness V
6 Marking
Example of marking the internal thread of the wire thread insert M8×1 (i.e. nominal diameter×pitch): JB/T7604.2—94 Internal thread M8×1 for thread insert Additional instructions:
This standard is proposed by the Ministry of Machinery Industry.
This standard is under the jurisdiction of Nanjing Gas Turbine Research Institute. This standard was drafted by Nanjing Steam Turbine Electric Machine Factory. The main drafters of this standard are Deng Aiping and Yu Weihua. 83
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