HEX NUT 8.8

Definitions of hex nut. noun. a nut with a hexagonal shape. type of: nut. a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt. So, in English, a Property Class 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of that nominal tensile strength, so 640 MPa.