HEX BOLTS SUFACE:Z.P,BLACK,HOT DIP,DACROMET SIZE:M6-M24X20MM-400MM GRADE:4.8,8.8,10.8,12.9 HEX BOLTS1) VARIOUS KINDS OF BOLTS AVAILABLE,2) CAN BE MADE WITH DIFFERENT TENSILE STRENGTH,SUCH AS CLASS 4.8,5.8,6.8,8.8,10.9,12.93) CAN SUPPLY WITH DIFFERENT FINISH,SUCH AS BRIGHT,ZINC PLATED,HOT DIP GALVANIZED, MECHANICAL PLATING,BLACK.4) CAN BE MADE WITH DIFFERENT STANDARDS,ISO, DIN, BS. Hexagon head ...