Plastite Screws are specially designed for use with plastic housings. These fasteners feature a specialised thread, which is designed to be self-tapping and create its own threads when used in pre-drilled plastic holes. Plastite Screws generally have 'sharper' threads than equivalent Self Tapping Screws, which cuts deeper into a housing, giving good resistance to pullout or stripping. Plastite Screws are commonly used to prevent deformation when fastening into the ends of plastic tubing, or into plastic bosses.
The trilobular thread shape of these components is specially designed to ease radial force during installation into low-density materials. A trilobular thread has three 'lobes' for cutting, and three recessed relief areas, which allow material to creep (or cold flow) into these spaces during installation. Trilobular threads can also be found on Accu's Taptite Screws, which are specialised for use in aluminium.
Plastite 45's have a thread angle of 45 degrees. This means that each 'tooth' has a 45 degree point. A sharper tooth means that each screw can cut, rather than just push, into a housing. Because of this, less force is exerted during installation. Plastite 45's are generally recommended for use in medium-density plastics. Plastite 45's have a slightly smaller major diameter when compared to Plastite 30's, making them more suitable for use in very thin housings.
Plastite 30's have a thread angle of 30 degrees. Dependent on a very large number of variables, Plastite 30 fasteners generally exert around half as much radial force during installation as the equivalent size of Self Tapping Screw. The thread of a Plastite 30 Screw has an almost identical volume to that of a Plastite 45 or even a Self Tapping Screw, but due to the narrower thread angle of Plastite 30's, each thread of these fasteners is slightly taller and sharper. Plastite 30's are generally recommended for use in soft plastics, but due to their slightly increased major diameter, they are not recommended for use in very thin plastic bosses.
Plastite Screw Materials
Plastite Screws are manufactured from A2-70 Stainless Steel as standard. Chemical Blackening can be applied to almost all components in this range. If specialist materials or finishes are required, please contact us.
Bespoke Plastite Screws For Plastics Manufacture
High precision, bespoke manufacture of Plastite Screws For Plastics to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.