500 Pcs Phillips Truss Head Sheet Metal Self Tapping Screw 18-8 (#8 x 1-1/4 Black)

Phillips Truss Head Sheet Metal Self Tapping Screw 18-8 Stainless Steel #8 A Truss head self-tapping screw threaded from tip to head and used without a nut for fastening lapped sheet metal and some other materials. Features: Screw Body Size : #8 (0.168 - 0.162) Head Height : 0.118 Head Diameter : 0.384 Drive Type : Phillips #8 Material : 18-8 STAINLESS STEEL Min. Thread Length : Fully Threaded Max. Thread Length : Fully Threaded Hardness : 99 ROCKWELL B Package Quantity : 500 Common Fastener Label Definitions Stainless Steel - With the addition of 12% chromium to iron stainless steel is formed. The chromium protects the iron against most corrosion or red colored rust; thus the term stainless steel . The ability of stainless to form a thin layer of protection on its outside surface called a passive film is its most important characteristic in preventing corrosion. 18-8 - 300 series stainless steel having approximately (not exactly) 18% chromium and 8% nickel. The term 18-8 is used interchangeably to characterize fasteners made of 302 302HQ 303 304 384 XM7 and other variables of these grades with close chemical compositions. There is little overall difference in corrosion resistance among the 18-8 types but slight differences in chemical composition do make certain grades more resistant than others against particular chemicals or atmospheres. Tensile Strength - A common measure to compare the strength of a fastener. It is the load needed to pull the fastener apart.