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
- Reduces 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 (>30%)
Design Features
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
Design Guide
Boss design depends on the following factors:
- – Type of thermoset material used
- – The density of the material
- – The amount and type of filler
Because of these variables the following recommendations are minimum and maximum guidelines only.
Dimensions
PRODUCT CODE WN 17
HEAD STYLE 42 Pan
HEAD STYLE 43 Countersunk
Standard Recess Styles
Other available recesses are shown on optional features page.
Size Range
Material
Case Hardened Mild Steel
Standard Finishes
Zinc Plate and Clear Passivation (Z)
Zinc Plate and Chromate (ZC)
Zinc Plate and Black Chromate (ZBC)
Other Finishes
Possible on quotation
How to Specify
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