Easy to tighten  Fastener Expertise Q & A    No. 6
When the coupled member is subjected to a lateral external force, such as a bolted joint with a hinged hole, the failure is mainly ______.
A. Pull off the thread
B. Pulling and twisting at the thread
C. The bolt rod is sheared or bolted or crushed by the joint
D. Thread root fracture
Review: Easy to ask questions 5th adjustment and blocking thread---fastener expertise
For use as a thread for adjustment or blockage, _____ should be used.
A. triangular coarse thread B. rectangular thread C. zigzag thread D. triangular fine thread
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