INSERTS FOR PLASTICS - SPIROL

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LF = F x L INSERTS FOR PLASTICSPlasticInsertBoltFriction ForceForceLTo rqueF x LAxial Load(Tension)To rque = Coefficient of Friction =To rque x Bolt WHY INSERTS ? INSERTS provide reusable threads and secure tight threaded additional benefit is high load carrying LOAD CARRYINGThe load carrying ability of the joint is enhanced by the larger diameter of the insert as compared to the screw. INSERTS are generally twice the diameter of the screw and that increases the shear surface fourfold. Pull-out resistance can further be enhanced by increased insert BYSTRESS RELAXATIONA common problem with bolted joints in plastic applications is that plastic is susceptible to creep or stress relaxation.

Self-Tapping and Headed Inserts. Counterbores are recommended for Self-Tapping Inserts to reduce the risk of flaking. The outside diameter of the counterbore should be equal to or larger …

  Self, Insert, Tapping, Tapping inserts