Features: DIN standard: DIN934: Hexagon Nuts DIN555: Hexagon Nuts DIN439: Chamfered Hexagon Thin Nuts DIN936: Hexagon Thin Nuts DIN562: Square Thin Nuts DIN557: Square Nuts DIN6923: Hexagon Nuts With Flange DIN985: Prevailing Torque Type Hexagon Thin Nuts With Nonmetallic Insert. ANSI standard: ANSI IFI D-5: Hex Nuts and Hex Jam Nuts ANSI IFI D-14: Heavy Hex Nuts and Heavy Hex Jam Nuts ANSI IFI D-8: Hex Thick Nuts ANSI IFI D-3: Square Nuts ANSI IFI D-12: Heavy Square Nuts ANSI IFI D-21: Hex Flange Nuts JIS standard: JIS B1181: Hexagon Nuts B.S standard: B.S.916: Black Mild SteelHex Nuts B.S.1083: Bright Mild Steel Hex Nuts B.S.: Square Nuts ISO international standard: ISO4032: Hexagon Nuts ISO4033: Hexagon Nuts ISO4035: Hexagon Thin Nuts GB standard: GB-52, GB-51, GB-54, GB-6170, GB-6173, GB-6174, GB-6175