200 Piece Polyplast Pozi Pan Self-Tapping Thread Forming Screws for Plastic Kit

Product Information

Every type of plastic has unique performance difficulties, such as ductility, thermal expansion, and clamp retention. Choosing a fastener that best meets these characteristics is essential to a successful screw joint in your product designs.

This is a challenging question to answer and one which can and does puzzle many. Self-tapping screws tap their own thread, which means they require a pilot hole which is slightly smaller than the diameter of the screw. They work on the premise that if you drill a pilot hole into a soft material like wood, as you drive the tapping screw in, its threads will make the material secure by digging its way into it.A self-tapping thread-forming screw would typically be used in plastic, and it deforms the material as it enters and drives inward. Thread cutting screws– A 30 o& 60 o circular thread form with a notched end designed for cutting a thread is used on harder plastics such as thermosets.

Flexural modulus is used to identify the effectiveness of the self-tapping screw joint. Generally, the lower flexural modulus means that more material will flow around the thread profile and allow better thread formation, hence a better joint. Higher flexural modulus thermoplastic would usually need a low helix angle fastener to avoid excessive drive torque. Effect of additives and fillersThere’s a huge range of different types of self-tapping fasteners and each can be set apart by a designation which describes its point (tip) and threads. Here are the most common self-fasteners and how you might use them in your applications: The Sheet Metal Screw