Easy to tighten  Fastener Expertise Q & A    No. 5
Phase 5: Threads used for adjustment or blockage should be _____.
A. triangular coarse thread B. rectangular thread C. zigzag thread D. triangular fine thread
Review: Easy to ask questions 4th stage Triangular fine thread self-locking and struts tensile strength
Compared with the coarse thread, the triangular fine thread of the same nominal size has a small pitch and a small diameter because of the fine thread, so the _______ of the fine thread.
A. Good self-locking property, low tensile strength of the nail rod B. Good self-locking property, high tensile strength of the nail rod
C. Poor self-locking property, high tensile strength of the nail rod D. Poor self-locking property, low tensile strength of the nail rod
( Strength - refers to the carrying capacity of the threaded rod.)
Answer diagram:
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