Self tapping screws for plastics

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Self-tapping screws for plastic, as the name implies, form or tap its threads when screwed into the plastic material with either pre-drilled or moulded pilot holes. These provide an economical method of joining two plastics or plastic to metal and allow easy disassembly and reassembly.
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trfastenings.com
engineeringproductdesign.com
celofasteners.com