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PRELOK Fasteners
Direct Screw Fixings provide a fast, economical, production line
solution to
fixing plastic and light alloy components where the need for re-use and high
assembly torque is not a major factor.
The unique patented thread forms of the PT® Screw range have been
engineered to maximise the advantages of Direct Screw Fixings with forming
screws for thermoplastics and light alloy materials and cutting types
for use with thermosetting materials.
The Duro-PT® Screw
The Duro-PT® SCREW is a direct screw fastener for use in thermosetting
plastics.
The design incorporates many unique features which provide designers with
a really effective direct screw fixing for these materials. The cutting notch
combined with the profiled thread root and special thread form provides low
installation and high stripping torques.
The efficient removal of cutting debris ensures greatly reduced bursting
forces, providing the solution to a common problem associated with
conventional self tapping screws, when used in thermosets.
Advantages
- Reduced stress in thermosetting plastics
to an absolute minimum
- Wide safety margin between installation
and stripping torque
- Suitable for all types of thermosetting
plastics
- Can be used in thermoplastics with a
high fill content
Special Cutting Notch
- Removes 60-80% of material cut during the thread
cutting operation
- Reduces installation torque
- Reduces radial pressure
Special Profiled Root
- Provides space for debris
- Reduces radial stress
- Reduces installation torque
- Increases stripping torque
 Special Shaped Tooth
- Reduces radial stress
- Maximum surface bearing area
- High stripping torque
- High clamping force
- High back-off torque 30
 Duro PT Screw Data Sheet (pdf)
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