Forged carbon and alloy steel screwed and socket-welding fittings. Screw threads in accordance with API Std. 5B. Bore diameters of socket-welding fittings compatible with BS 3600 and BS 1600. Substantially agrees with ANSI B16.11, ASTM A 234 and ASTM A 403.
BS 3799:1974 history
1974BS 3799:1974 Specification for steel pipe fittings, screwed and socket-welding for the petroleum industry