DIN and ASTM hex nuts are widely used in house constructions
DIN and ASTM hex nuts cover from 4.8,8.8,12.9 and Gr2,Gr5,Gr8 grade,passed many serious tests.such as mill test,Tensile strength Rm/MPa,Proof load,Rockwell hardness (1d,Half radius）/HRB.easy to install.
DIN and ASTM hex nuts is ISO 9001 certificate
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