3/8-16 Stainless Steel Phillips Round Head Machine Screws 18-8 Stainless Steel Includes 303 & 304 Grades 3/8"-16 Right Hand Thread, UNC Fully Threaded For Use With A Pre Tapped Hole Or Matching Hex Nut. Rust and Corrosion Resistant Standards: ANSI B18.6.3 Please View Matching Nuts & Washers Below.