... 8,9.8........ WAVE PLATE HEAD SCREW,DOUBLE HEAD SCREW,KNURLED HEAD SCREW A good non-standard fastenerS manufacturer ... tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads for Machine ... 25kg each carton;G.W. for a carton:23 kg-26kg. 3)Carton's Size :34cm*26cm ... C1022 ,The percent C element is 0.18%-0.23% ,is higher hardness than other.2.Fasteners' ...