... .2.2,DIN6330,DIN6334,ASME B18.2.2,BS916,DIN 439,DIN 936,ISO4035,DIN 971,ISO 8673,ISO 8675,etcNuts Size Metric ... standard, 100% Whole range inspection through the production. Inspection equipment:Hardness test, torque test, salt spary endurance test, mechanical sizes test ...