Does the threaded boom need to be sent for inspection?

Need. Threaded suspenders need to be sent for inspection, and raw materials must be inspected before use. According to the code for acceptance of building construction, the quality of straight threaded joints submitted for inspection needs to be submitted for inspection. If the tensile strength of raw materials is lower than the standard, it is impossible to detect the tension of the sleeve. If it is much higher than the standard, it will damage the straight thread and break the sleeve connection.