An American National Standard. The American Society of Mechanical Engineers (ASME). Revision of ANSI/ASME B1.20.7-1966. Date of Issuance: April 16,1992. 24 p. The purpose of this document is to provide standards for application to the threaded parts of hose couplings, valves, nozzles, and all other fittings used in direct connection with hose intended for domestic, industrial, and general service in nominal sizes of 1/2, 5/8, 3/4, 1, 11/4, 11/2, 2, 21/2, 3, 31/2, and 4 in.