Sandwich panel screws are optimized for fastening to sandwich panels to steel or timber substructures. These screws, either self tapping or self drilling, feature a secondary thread that grips the outer skin of the sandwich panel and ensures that the sealing washer is pressed against it with adequate pressure while avoiding damage or local deformation of the sheet metal. For this purpose, the secondary thread has a larger diameter than the lower thread that is driven into the supporting structure.
Indented hex washer head
Size : M6.3/5.5 M7.0/5.5
Length : 50~400MM
Surface : Zinc plated, ruspert
EPDM washer : steel, stainless steel, aluminum