... screw or Connecting screw1.Head type:Flat Pozi ,Flat Hex Socket.2.Standard: ANSI, ISO, DIN, BS, JIS, AS 3.Material ... : Low carbon steel(C1008, C1010, C1012, C1015, C1018, C1022), 4.Surface: Zinc plated(yellow, black, green), black oxide, nickel plated, chrome ... plated, Cr+3, hot dip galvanized, brass plated.Sizes: Hex socket: 1) Deep hole: 7 x 50 2) Shallow hole: 7 ...