ANSI B16.47 Series A Flanges

ASME B16.47 Series A flanges originate from MSS SP-44 and represent the heavier of the two large-diameter flange series. Covering nominal pipe sizes from NPS 26 through NPS 60, Series A flanges feature thicker bodies, more bolts, and larger bolt diameters than their Series B counterparts. This makes them the preferred choice for critical services in refineries, power plants, and offshore platforms where maximum joint integrity is required.