![]() The tensile stress area, or stressed area, is the cross-sectional area of the threaded part in direct contact with the mating threads. Keep in mind - While designing for minimum thread engagement length the designer should take into consideration the tolerance stack-up of the joint, the material ultimate tensile strengths, and the tapping tool being used. The length of thread engagement is the length of which the bolt and mating part’s threads are in contact with each other. One of the few ways the designer of a bolted joint can control the strength of and failure point of the joint is with length of thread engagement. The bolted joint is expected to withstand the maximum applied forces to the joint over its lifetime of operations.Īn important rule of thumb while designing bolted joints is to ensure that shear failure occurs in the screw or fastener, often times the externally threaded part. Designing a bolted joint involves many structural considerations including preload requirements, torque requirements, thread engagements, etc.
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