Plastic screw TPX

pan headFrearsonstainless steel

The Tappex TPX thread forming screws (not thread cutting) are designed to be used in most thermoplastic materials. These screws can be installed into drilled or moulded holes in a wide variety of applications. Tappex TPX screws are produced by cold forging, not machined from bar or wire and therefore have good inherent mechanical properties with minimum residual stress. Typically the workpiece material or substrate will relax as the screw rotates during installation and then shrink back, a little. Thread Forming Screws® – Features Range of diameters and thread lengths Philips or Recessed Star Drive Hardened steel with a zinc and clear passivate Stainless steel 303 grade 30 degree thread flank angle offers the following benefits: Reduced installation torque Reduced potential for over tightening Reduced stress induced in the plastic. (care should be taken with notch sensitive plastics) With care the TPX screw can be re-installed multiple times Thread Forming Screws® – Design Considerations For successful installation and application a number of factors should be taken into consideration: Hole size and design – recommended hole geometry available from Tappex (See ETP 45 downloadable from Tappex website) Type and grade of Plastic Boss wall thickness – to withstand installation forces and maximise performance Installation depth Required application and strip out performance For advice, please contact our Applications Engineering Department with your specific requirements.