I often get calls from people looking for plastic thread forming screws and generically assume that all screws are created equal. It's probably better to say that every screw thread form has a purpose.
Two innovators of thread design are EJOT and Reminc. EJOT developed the PT Screw and Reminc developed the Plastite. Both license their designs to screw manufacturers around the world. They constantly develop new products as well to protect their patents and their profits. Manufacturers like Semblex produce these licenced products.
The PT screw has a very thin 30 degree angle cross section of thread and a recess to allow for material displacement in the root of the thread.
The Plastite 48-2 has a trilobular thread pattern, a 48 degree angle cross section of thread and a twin lead.
The PT screw is intended to reduce hoop stress in the boss that the screw will be used on. Because of this a thinner boss may be utilized which speeds cycle times on plastic injection molding machines. This is a big money saver for a company like Qualcomm. The latest development of the PT screw is the Duro PT.
The Plastite 48-2 has a thread form that reduces heat when driving the screw and provides for a reduction stripping while increasing drive torque. The twin lead means the screw seats very fast because it requires half the revolutions. This is generally a good thing for softer plastics. There is also a Plastite 45 and Plastite 60-1 thread pattern.
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