Easy to tighten  Fastener Expertise Q & A    No. 4 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.) Review: Easy to ask questions 3 When the threaded joint is used, if the total thickness of the joint is large, and the material is soft and the strength is low, but it is not necessary to install and disassemble frequently, it is preferable to adopt the double-head stud connection. is it right or not? Answer diagram
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