![]() (b) size and method of designating openings of reducing fittingsĪSME/ANSI B16.4 - 1998 - Cast Iron Threaded Fittings.This Standard for threaded malleable iron fittings Classes 150, and 300 provides requirements for the following: (f) bolt, nut, and gasket dimensions andĪSME/ANSI B16.3 - 1998 - Malleable Iron Threaded Fittings.(d) minimum requirements for materials,.(b) sizes and method of designating openings of reducing fittings,.This Standard for Classes 25, 125, 250 Cast Iron Pipe Flanges and Flanged Fittings covers: ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings The ASME - American Society of Mechanical Engineers - ASME/ANSI B16 Standards covers pipes and fittings in cast iron, cast bronze, wrought copper and steel.
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