Head design: Hexagon head with flange surface, providing a larger load-bearing area.
Thread type: Half-thread design, the length of the unthreaded rod is about 1-1.5 times the diameter.
Material: Carbon steel, usually grade 4.8, 8.8, or 10.9.
Surface treatment: Galvanized to provide corrosion protection.
Applicable scenarios
Mechanical connections that require a large preload.
Fastening in a vibrating environment, because the design of the flange surface can further prevent loosening.
Thanks to the anti-rust function of galvanizing. So it is also suitable for outdoor or humid environments.
Connection of components that need to be disassembled and maintained.
Installation steps: Check that the bolt specifications match the aperture of the connected parts, clean the connection surface, remove impurities such as oil stains and burrs; prepare a wrench that matches the size of the opposite side of the hexagonal head.
Installation method: First, insert the bolt into the connection hole from one side, with the flange surface facing the surface of the connected part, then put on the flat washer and nut on the other side; then tighten the nut by hand until it contacts the flange surface; finally, use a torque wrench to tighten it according to the standard torque value.
Precautions
Anti-loosening measures: In a vibrating environment, it is recommended to use elastic washers or anti-loosening nuts
Reusable: It is not recommended to disassemble and reuse bolts above grade 8.8
Corrosive environment: In a severely corrosive environment, it is recommended to add anti-rust measures or use a higher grade of plating
Lubrication: A small amount of grease can be applied to the threads to reduce the friction coefficient and obtain a more accurate preload
Prohibitions:
Do not use pneumatic tools for direct tightening
Do not exceed the maximum recommended torque value
Do not install ordinary washers between the flange surface and the connection surface
Maintenance recommendations
Check the tightening status regularly, especially in a vibrating environment
If the plating is damaged, anti-rust treatment should be carried out in time
If the thread is damaged during disassembly, replace a new bolt
Proper use of hexagonal flange bolts can ensure the reliability and service life of the connection. It is recommended to select the appropriate strength grade and surface treatment method according to the specific application scenario.
