... 20 years experience in special fastener field 1,Name:Brass female coupling; Brass coupling;Female coupling 2,For the similar coupling,what ... ,4140,G51150,etcStainless steel201,202,301,302,303,304,316,310,430,etcBrassC28000,C37710,C3450,C27200,etcBronzeC51900,C60600,C17200,etcAlumimum100,5052 ...