... 4.Standard:GB,DIN,JIS,ANS High quality brass machine screws 1. Standard:DIN,ANSI, BSW, JSB ans ... . professional manufactuer, offers better quality and price Productbrass machine screws Materialbrass, copper FinishPlain or as request SizeM4~M60 ... , Cold forging, Hot forging, Forming, Cutting, Shrink diameter, Threading, Thread rolling, Drawing, Pickling, Passirating, Waste water treatment, Grinting ...