The Fastener Solution for Thermoplastics
Benefits
Reduces radial stresses
Allows for thinner boss design
High resistance to pullout forces
Provides repeat assembly
Minimizes clamp load loss
Features
30° thread angle
Optimum pitch
Profile thread root
Round cross section
Tightening Torque
Given the fact that relaxation and stress cracking tendencies increase with clamp load, it is recommended that the specific tightening torque should be the minimum required rather than the maximum achievable.
Influence of Driver Speed
In addition to being aware of the effect of excessive torque on the assembly, attention must also be paid to the driver's speed. As the fastener is rotated, heat is generated within the assembly. This heat is instrumental in allowing the plastic to flow into the thread’s root diameter, provided it is controlled.
When the speed becomes too high, excessive heat is created. This heat can then have a negative impact on the overall assembly profile...
Optimizing the Design
The graph to the right exemplifies the relationship between torque and the hole diameter. The optimum hole diameter is selected based on the widest margin between the installation and strip torque.
Material: ABS
Fastener:
K40 x 16 PT®
Torx Pan Head
Installation Depth: 8mm
Additional Family Products
The Evolution of Direct Fastening into Plastic
New Thin Thread Technology for Thermoplastics
Data Sheet(s)
