Square drive pan head machine screws in this selection range in both UNC (Coarse Thread) and UNF (Fine Thread) and sizes from #6-32 up to 1/4"-20. Square Drive machine screws are often used with nuts as well as driven into tapped holes. In practice, they tend to be mostly available in smaller sizes and the smaller sizes are referred to as machine screws. The square drive style is used to deter stripping when installed correctly. This allows the machine screw to have more torque applied effectively.
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