500 Pcs Phillips Oval Head Black Oxide Sheet Metal Screws (# 8 x 1/2")

500 pcs Phillips Oval Head Black Oxide Sheet Metal Screws Stainless SteelAn Oval 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 : 0.115"Head Diameter : 0.322"Material : 18-8 STAINLESS STEELMin. Thread Length : Fully ThreadedMax. Thread Length : Fully ThreadedHardness : 99 ROCKWELL BPackage Quantity : 500Common 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.