Are the screw holes for mounting inserts tapped or will it require nuts on the back side to hold in the inserts?

Thank you for your enquiry. The mounting insert holes are not tapped. You will require nuts on the back or you can use our product COMFD - https://www.pennelcomonline.com/en/Penn-Elcom-M3-Mounting-Frame-for-unified-chassis-MFD/m-5179.aspx Kind Regards Penn Elcom Online
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