With a high thread profile and recessed thread root,the PT fastener provides increased thread engagement with minimal stress on the boss. It provides optimal performance in a wide range of thermoplastics.
Key Advantages
¡ôOptimizes performance in all types of thermoplastics
¡ôProvides maximum resistance to back-out and pull-out
¡ôMinimizes boss failure
¡ôIncreases product reliability
Features & Benefits
Narrow 30 thread profile minimizes radial expansion and stress in boss
¡ôPermits use of thinner bosses, which can reduce cycling times and material usage
¡ôReduces back-out caused by relaxation
¡ôIncreases load-carrying capability through in creased thread engagement
¡ôCan be used in repeat assembly operations
Optimun thread pitch allows deeper thread engagement
¡ôProvides increased pull-out values
¡ôOptimizes non-reversibility
¡ôBalances load ratio between plastic and screw
Recessed thread root allows optimal material flow
¡ôMinimizes installation torque
¡ôImproves clamp load
¡ôMinimizes potential of boss cracking
Round body evenly distributes surface contact between application and screw
¡ôImproves load ratio
¡ôReduces high points of stress on the boss
Through hardened to HRC 33-39
Laboratoty testing and service applications have produced the general recommendations shown here. Specific applications may, however,require some modifications to allow for:
¡ômolding conditions ¡ô feed distance from gate
¡ômold tool design ¡ôweld lines
¡ôamount of reground material ¡ôstructural heterogeneity
In order to ensure optiomal performance, we strongly recommend testing on initial samples.
Boss Design Example
Material:ABS
To calculate boss size based on fastener size:
Screw size£ºK40
Major diameter£º4mm
BOSS O.D.£º2d=2¡Á4=8mm
Boss I.D.£º0.8d=3.2mm
Min.Length of engagement d=2¡Áscrew dia.=2¡Á4mm=8mm
Model£ºPT Thread-Forming Fasteners
