Materials: Brass H62 for sizes under and incl M6; H59 for size M8 and up Surface: bright passivated, nickle plated 1, Materials: Brass ... H62 for sizes under and incl M6; H59 for size M8 and up; 2, Tensile 50,000, Yield:35 ... color without oxide washing for environmental protection;5,Export worldwide over 15years, our brand products. ISO4032 Brass Hex Nut Full and Half