Union nut Specification: DN10-DN150, 1/2"-6", larger size can be customized Materials: AISI304, AISI304L, AISI316, AISI316L Union nut(ISO9001: 2008, CE, TUV certified) Specification: DN10-DN150, 1/2"-6", larger size can be customized Materials: AISI304, AISI304L, AISI316, AISI316L Surface treatment: Mirror polishing(180G, 240G, 400G), inner surface mechanical polished Ra less than 0.4 - 0.8μm, ...