... : m6-30x20-250mm. 3. certificate:ISO9001:2000. 4.finish:zinc, black, plain,H.D.G. hexagon screw gradestandardmaterialdiameterlengthsurface3.6(A)DIN ... *90-3005)grade:4.6,4.8 ,5.6,5.8,6.8,8.8,10.96)finish:zinc, black, plain,H.D.G7) material :Carbon ... Steel,swrch35k,45#8)thread;BSW,BSF,UNC ...