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You are here: Home > Materials > Installing a Fastener in Plastics
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Materials

  For Aluminum

  For Magnesium

  For Plastics

    - Plastic vs Standard

    - Properties of Plastics

    - Installation

    - Design Issues

    - Fastener Selection

    - Threaded Fastener Selection

  For Sheet Metal

  For Steel







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Installing a Fastener in Plastics

Optimal fastening solutions.

Thread forming and strippping torque

Because friction increases as penetration increases, the differential between the thread-forming torque and the strip (failure) torque must be maximized.

Proper seating torque varies from application to application, so contact an applications engineer for assistance.
Drive-to-strip ratio

As demonstrated in the chart on the right – based on testing – the fastener for plastic has a much higher drive-to-strip ratio, so the joint is less likely to be damaged during installation.

The standard screw has a safety margin of only 0.6 Nm. The special fastener for plastic has a safety margin of 2.1 Nm.

Note: The chosen seating torque was 65% of the failure torque, based on testing.

Influence of driver speed

Increased drive gun speed can negatively affect the quality of the joint.

During installation, as the RPMs increase, so does the amount of heat that is generated. Too much heat can break down the plastic and lower the failure torque level.

Determining proper seating torque

Acument Global Technologies can run complete tests on your application to determine your optimal fastening solution, including fastener selection, joint design and seating torque.
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Acument™ Global Technologies Europe
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General Information:
infoEurope@acument.com