Easy to tighten  Fastener Expertise Q & A    11th issue
No. 11: The breakage of the bolts is the most likely to occur in ______.
A. Near the screw head B. The part in the screw
C. The position of the thread finishing end D. The thread part close to the nut bearing surface
Review of the previous issue: Easy to ask questions 10
In various measures to prevent the threaded connection from loosening, ______ is ineffective when subjected to shock or vibration loads.
A. Use a locking device with increased friction, such as a spring washer between the nut and the coupled member.
B. Use mechanical means to prevent loosening of the device, such as hexagonal slotted nuts and split pins.
C. Use artificial methods (such as glue or welding) to make the thread pair unable to rotate.
D. The design makes the threaded joint self-locking (even if the thread angle is less than the equivalent friction angle).
Answer analysis: Answer: A
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