Self-tapping Screws - Threaded Inserts for Plastics

The external thread of the SPIROL Self-Tapping Insert forms an internal thread within a molded or pre-drilled hole during the installation process in a plastic assembly. The SPIROL Series 10 Self-Tapping Inserts are the most suitable thread-forming inserts for softer thermoplastics or thermosets. Self-Tapping Inserts provide the best pull-out resistance for an insert installed after molding, although they generally cost more than their post-molding counterparts. The external threads are designed with a fine profile to minimize stress induced in the plastic and have a relatively coarse pitch to provide maximum shear surface of the plastic to resist pull-out.