pan head screw / Frearson / stainless steel / self-tapping
self-tapping, for plastics
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 material into which it is being installed.
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
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.
Required application and strip out performance.
For advice, please contact our Applications Engineering Department with your specific requirements