We carry an extensive inventory of bronze unions in multiple sizes to meet your piping specifications. We also carry a full line of stainless and other alloy unions to meet specific needs. View our product line card. Our pipe sizes and weights chart can help in your search for general nominal pipe size information. Bronze unions conform to ASTM B62-93 (85, 5, 5, 5) C83600. Dimensions ANSI B 16.15, Threads are ANSI B2.1 or BA21 and Fed. WW-P-460 UL/FM approved. View our standard specifications chart. View our Stainless Steel Grades resource chart. View thousands of bronze and stainless steel pipe and tubing products and various custom fabrication services Shaw Stainless has to offer. This Reference Catalog identifies bronze pipe unions and other stainless, other alloy and bronze fittings with specification charts and illustrations. Review theoretical bursting pressures for various stainless steel pipe. Bronze unions are pipe fittings designed for a simple connection and disconnection for any future pipe maintenance or replacement. The union is similar to the coupling, but a coupling requires additional, lengthy work to disconnect and remove from the piping system. Unions have three parts to the configuration consisting of a male end, a hex nut and a female end.