In summary: Material: AISI-1022 heat treated carbon steel Core Hardness: HV 390 - 420 Surface Hardness: HV 560 - 670 Wedge Test: 15 Torque Strength: 48kg/cm Diameter: 8,10 G Length: 32, 40, 45 mm. Tensile: 34 N Shear: 68 N This is a link to the SHERA ...