ASME B16.5（SO）Flat welding flange with neck

Neck flat welding flanges are the same as plate flat welding flanges. Steel pipes and pipe fittings are extended into the flange to connect with equipment or pipelines through fillet welds.

The sealing surface forms include: raised surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF), ring connection surface (RJ).