large size black M16 U bolt(manufacturer) 1.Material:carbon steel 2.Surface:Plain,black ... Use:metallurgy etc 4.ISO90 Item:large size black M16 U bolt(manufacturer) Production Description:1MaterialLow-carbon steel,mid-carbon steel, ... #,45#,40Cr,35CrMoA,25Cr2Mo1VA etc)2SizeM16-M303Length40mm-200mm4Usingpetrochemistry, metallurgy, power, pipelineaccessories etc5Grade8.8,9.8,10.9,12.96StandardDIN,ANSI ...