PLASTITE® 45 screws represent the latest refinement of the
cost savings and performance capabilities of TRILOBULAR™ technology
for assembling plastic components. The TRILOBULAR™ shape makes use
of the plastic's natural resiliency and creep characteristics allowing the
plastic to fill in the depressions between the lobes. This helps lock the
fastener in place providing prevailing torque if fastener removal is attempted.
Years of research revealed that exceptional performance could be achieved
by combining the TRILOBULAR™ shape with the following attributes:
The extra wide thread spacing and more acute thread angle of PLASTITE® 45 screws keep induced stress to a minimum during the thread forming operation. These attributes also permit a deeper thread without increased drive torque. Also, the extra wide thread spacing allows stress to be dispersed over a greater area in the plastic boss or nut member, and the plastic material remaining between the threads is left strong and intact, thus providing for high assembly loads and stripping resistance. The narrow thread angle also reduces stress by displacing less material and creating less bursting pressure. (See above illustration).
Hardened and tempered screws are significantly stronger than plastic so if the assembly becomes over-torqued, the plastic will usually give way and strip out. Strip out in the plastic will occur cylindrically so the more nut member material that remains within the cylinder the more resistant to strip out will be the plastic. It is for this reason the wide thread spacing of PLASTITE® 45 screws increase the assembly strength at the same time that it reduces stress.
PLASTITE® 45 screws are the perfect balance between application needs and efficient manufacturing for consistent performance.
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