This standard specifies the installation requirements and installation dimensions of locking wire thread inserts (referred to as thread inserts). This standard applies to locking wire thread inserts. JB/T 7604.4-1994 Installation requirements for locking wire thread inserts JB/T7604.4-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Locked Wire Thread Inserts
Subject Content and Scope of Application
Installation Requirements
This standard specifies the installation requirements and installation dimensions of locked wire thread inserts (referred to as thread inserts). This standard applies to locked wire thread inserts. 2 Reference Standards
Ordinary Thread Tolerances and Fits
JB/T7604.1 Types and Dimensions of Locked Wire Thread InsertsJB/T7604.2 Internal Threads for Installing Wire Thread InsertsJB/T7604.3 Technical Conditions for Locked Wire Thread Inserts Requirements for Thread Inserts Before Installation
3.1 Dimensions and tolerances of thread inserts shall comply with the provisions of JB/T7604.1. 3.2 Technical conditions of thread inserts shall comply with the provisions of JB/T7604.3. 4 Requirements for screw holes before installation
4.1 The internal thread for the screw sleeve shall comply with the provisions of JB/T7604.2. JB/T7604.4--94
4.2 The minimum drilling depth H and recommended drilling depth H of the screw hole for the screw sleeve shall comply with the provisions in Figure 1 and Table 1. 4:3 The minimum thread depth h of the screw hole for the screw sleeve shall comply with the provisions in Figure 1 and Table 1. 4.4 The chamfer angle of the hole and the countersunk diameter M of the screw hole for the screw sleeve shall comply with the provisions in Figure 1 and Table 1. 20
Approved by the Ministry of Machinery Industry on December 9, 1994
Implemented on June 1, 1995
Nominal diameter×pitch
M12×1.25
M14X×1.5
Number of free turnsbzxz.net
17 1/8
JB/T 7604.4-94
Recommended drilling depth
Minimum drilling depth
Minimum thread depth
Drilling diameter
Maximum countersink diameter
Nominal diameter×pitch
M24×2
M30×3
Number of free turns
27 3/4
JB/T 7604.4-94
Continued Table 1
Recommended drilling depth
Minimum drilling depth
Minimum thread depth
Drilling diameter
Maximum countersink diameter
Nominal diameter×pitch
M33×3
M36×3
M39×3
M42×3
M45×3
M48×3
M52×3
Number of free state diagram
JB/T 7604.4—94
Continued Table 1
Recommended drilling depth
The screw hole should be cleaned after tapping.
5 Installation of threaded sleeves
Minimum drilling depth
Minimum thread depth
Drilling diameter
Maximum countersunk diameter
37, 18
Clean the threaded sleeves before installation. For threaded sleeves used under high temperature (370-538°C), anti-seizure agent should be applied to the screw holes before installation. 5.1
5.2Special tools should be used to install threaded sleeves, and the assembly torque should comply with the requirements of Table 2. 21
5.3 How to use special tools
5.3.1 Installation tools
Nominal diameter × pitch
M10×1
M12×1.25
Assembly torque
JB/T7604.4—94
Nominal diameter × pitch
M27×2
M30×3
Assembly torque
Nominal diameter × pitch
M33×3||tt| |M36×3
M39×3
M42×3
M45×3
M48×3
M52×3
Assembly torque
Use of the installation tool (see Figure 2): first insert the screw sleeve from the opening of the sleeve, so that the installation handle of the screw sleeve is embedded in the groove at the top of the rotating rod, turn the rotating rod clockwise, screw the screw sleeve into the guide sleeve until the installation handle of the screw sleeve is flush with the top of the guide sleeve, and then slowly screw the screw sleeve into the screw hole in line with the screw hole of the base.
5.3.2 Tool for removing the installation handle and its use
Rotating rod
Use of the tool for removing the installation handle (see Figure 3). Stick the sleeve to the surface of the base, insert the punch into the screw hole where the screw sleeve has been installed, and hit the tail of the punch with a hammer until the installation handle is separated from the screw sleeve. Punch
5.3.3 The installation handle should not remain in the screw hole after removal. JB/T 7604.4-94
5.3.4 How to use the disassembly tool.
The function of the disassembly tool (see Figure 4) is to remove the screw sleeve that needs to be replaced from the base screw hole. When using it, insert the triangular blade part vertically into the screw hole of the screw sleeve so that the blade edge clamps the screw sleeve, and rotate the handle counterclockwise to withdraw the screw sleeve. When using the disassembly tool, the base screw hole should not be damaged. Handle
Triangular blade
5.4 The position of the screw sleeve in the base screw hole is shown in Figure 5. Screw hole inspection after installing the screw sleeve
Connecting rod
0.25~0.5P
6.1 Use a standard thread gauge to check the internal thread. The coarse thread should meet the accuracy of 5H in the GB197 standard, and the fine thread should meet the accuracy of 3H. 6.2 The locking ring is not included in the internal thread accuracy inspection. 6.3 Check the position of the screw sleeve in the screw hole, which should comply with the provisions of Figure 5. Additional remarks:
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 and Electric Machine Factory. The main drafters of this standard are Yu Weihua and Deng Aiping. 23
People's Republic of China
Mechanical Industry Standard
JB/T7604.1~7604.4--94
Locking Type Wire Screw Insert
Beijing Electrical Engineering Comprehensive Technical and Economic Research Institute, Ministry of Machinery, Xiangtan Electrical Engineering Standardization Research Office, Ministry of Machinery
Edited, published and issued
(No. 302, Xiashesi Street, Xiangtan City, Hunan Province)
Printed by Xiangtan Electric Motor Factory Printing Plant
Book size 880×12301/16
First edition in June 1995
Printing number
Sheet No. 1 Number of characters 50000
First printing in June 1995
8-*091~1'7092 1/8
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