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| Self-Tapping Screws |
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Self-tapping screws are often used to fasten plastic parts together. Self-tapping screws are available both in thread-cutting type as well as thread-forming type.
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| Thread Forming |
| Pros |
Cons |
| High tensile values |
High hoop stress, boss has to be designed to withstand this stress |
| High amount of torque to strip threads |
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| Large number of cycles of assembly and disassembly possible |
Stress relaxation possible |
| Suitable for plastics that are non-brittle |
Not suitable for brittle plastics |
| Thread Cutting |
| Pros |
Cons |
| Lower Hoop Stress |
Lower Tensile Pullout |
| Suitable for brittle plastics |
Lower amount of torque to pull the threads |
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