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self tapping screw to polycarbonate material

self tapping screw to polycarbonate material

self tapping screw to polycarbonate material


I am now trying to design injection moulded parts with polycarbonate that requires to accomodate Dia 4.4mm self tapping screw. To do that, I would like to know what is the correct hole size in the moulded parts.
Do we have any self tapping chart against polycarbonate? I could see ones for metal sheet against self tapping screw; but no luck to have a chart for polycarbonate.

Thank you in advance.

RE: self tapping screw to polycarbonate material

Will the screw boss be designed into the plastic part? If so, I'd suggest using a screw designed for plastics, such as a Plastite® type screw. I've had good luck with these; I've been designing plastic injection molded parts (mostly ABS and PC) for 20 years.


RE: self tapping screw to polycarbonate material

Polycarbonate has a bad habit of cracking radially from the center of a self tapping screw. I suggest that you use a molded insert for your screw and a clearance hole for the PC.

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RE: self tapping screw to polycarbonate material

Or a well nut.

RE: self tapping screw to polycarbonate material

A Plastite type screw will be fine. Choose a manufacturer and they will give you the hole size and geometry for PC.
Note: you must ensure the screws are thoroughly free from oils and greases before use.

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