Optimal shore hardness for snap-fits in electrical housing

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Mark Knight

12.09.2024 at 10:31

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Hello, I’m designing snap-fit features for a small electronics housing made from PA12 (Nylon) and need to ensure the material provides the right balance of flexibility and durability. The snap-fit will be used for securing and accessing internal components, so it needs to handle multiple assemblies and disassemblies without wearing out or breaking. Does anyone have experience with PA12 in such applications, or can recommend a Shore hardness range that would work best for this type of snap-fit design?

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• • M

    Mark Knight

    12.09.2024 at 10:31

    Hello, I’m designing snap-fit features for a small electronics housing made from PA12 (Nylon) and need to ensure the material provides the right balance of flexibility and durability. The snap-fit will be used for securing and accessing internal components, so it needs to handle multiple assemblies and disassemblies without wearing out or breaking. Does anyone have experience with PA12 in such applications, or can recommend a Shore hardness range that would work best for this type of snap-fit design?

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    Tim Meyer

    12.09.2024 at 13:38

    In my experience, the Shore hardness you choose really depends on how often the snap-fit will be engaged. For more rigid snap fits, I usually go for materials with a Shore D hardness above 80, like polycarbonate. For parts that need more flexibility, like in some consumer electronics, softer materials around Shore D60-D70, such as polypropylene, are a good fit. Just make sure the material can withstand the repeated stress without deforming.

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      Tim Meyer.

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