non-standard pentagon head nut 1.grade:4/8 2.material:carbon steel/alloy steel 3.finish:plain/HDG non- ... standard pentagon head nut1.Standard:non ... M204.Standards:DIN ,ANSI/ASME,BS,GB,JIS,Non-standard.5.Surface:plain,zinc plated,black oxide,hot ... Arabia, Europe,South Korea,Southeast Asia ,etc. non-standard pentagon head nut