1. Before assembly, inspect the bolts, nuts or the wire holes of the connected parts daily, and there should be no bumps or scratches.
In accordance with drawings or relevant standards:
2. During the assembly process, the threaded part of the bolt must not be damaged.
3. The head of the bolt and the end face of the nut should be in even contact with the parts being fastened.
It should be inclined, and it is not allowed to hit the two planes with a hammer, and the screw has no bending deformation.
4. The parts to be connected should be evenly pressed, closely attached to each other, and firmly connected.
5. It is strictly forbidden to use inappropriate wrenches and sockets when tightening bolts and nuts.
6. The assembly of fasteners in strict accordance with the level specified on the drawings or process documents is not allowed in principle.
Low-performance fasteners are allowed to replace high-performance fasteners or high-performance fasteners to replace low-performance fasteners.
firmware.
7. When applying thread locking sealant (such as: anaerobic glue, etc.) on the external thread, it should be applied on the pitch screw
Within a length of 15mm from the end of the grain.
8. Generally, bolts and screws should be screwed in more than 2~3 pitches by hand when assembling, and then
Tighten again with a wrench or air tool. In particular, for larger thread diameters (usually ≥ M14),
When the tightening position is important, use a torque wrench to confirm the torque value and ensure the accuracy.
Special note: The pneumatic air trigger cannot be used as the final tightening tool (because its work is percussion
The hammer is constantly impacted to tighten, and the torque fluctuation range is too large. Moreover, it is affected by air pressure and air trigger.
Model, wear degree of gas trigger, impact time, etc.)
9. When assembling bolts, screws and nuts, pay attention to the paint film and coating of the connected parts.
Protection, pay attention to the protection of bolts, nut heads, screw slots, etc., and can not be damaged.
10. When the wire hole needs to be slipped, use a suitable tap, and ensure that the axis of the wire hole and the connecting piece are in line with each other.
The surface is vertical.
11. After the nut is tightened, the head of the bolt and screw should be exposed by 2 to 3 pitches on the end face of the nut. screw
When the female and flat washers are assembled together or the nut is assembled separately, the nut and washer are oppositely close to the connection.
body. (The side marked with the word is the front side of the nut, and the smooth side of the washer is the front side)
12. After the countersunk head screw is fastened, the countersunk head shall not be higher than the end face of the countersunk hole.