This International Standard specifies the characteristics of hexagon head screws with threads from M1.6 up to and including M64,Website:http://www.chinajinrui.net,of product grade A for threads M1.6 to M24 and nominal lengths up to and including 10 d or 150mm.whichever is the shorter,and product grade B for threads over 10d or 150mm,which ever is the shorter.This type of product is the same as that covered by ISO 4014 with the exception of threading up to head and nominal lengths up to including 200mm as preferred lengths.StandardMaterialFinishThreadISO4014  ISO4017  ISO4018carbon steelPlainUNCZinc platedAlloy steelYellow zinc platedPTFEStainless steelBlackUNFDacrometOtherHDGOtherISO4014