INSERTS FOR PLASTICS

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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. Under loads well below the elastic limit, PLASTICS will lose their ability to maintain a load. When this occurs, the threaded connection becomes loose. The brass and aluminum thread provides permanent creep resistance for the entire load path of the OF THE THREADED JOINTThe primary benefit for using an Insert is that it preserves the threaded joint integrity for the life of the application.

therefore, they impact post-mold Insert installation. The impact not only correlates to the type of filler, but also to the percentage used. Thermoplastics are rigid and solid at normal temperatures but at elevated temperatures they soften and melt. Some of the more common plastics in this category are ABS, nylon, PVC and polycarbonate.

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