Fastener for roof assemblies and the like

摘要: A fastener for securing a sheet metal roof panel to frame with layer of compressible insulation between the two includes an elongated shank tip at one end and driving head other. The either is inserted first through preformed hole in or which drills driven layer. thread on adjacent into draws flared portion enlarge latter roll over around edge hole. rolled then engaged by second enlarged under plate together washer are compressed so as prevent overdrive reduce possibility being dimpled. Longitudinally extending beads third produce smooth gradual rolling plate.