BBI Hex Bolt, Partially Threaded, Measurement System: Metric, M5x0.8 Thread, 40 mm Length Under Head, 8.80 Grade, Medium Carbon Steel, Zinc Blue CR+3, UNC Thread, 3.65 mm H Head, Hex Head, 800 N/sq-mm Tensile Strength, 5 mm Shank, 22 to 32 HRC Hardness