Pipe Fittings Certification : TUV , ISO 9001-2000 1) Name: Belt Neck ... ANSI, DIN, EN1092-1, BFE, AS, JIS and customers drawings for special use5) Types: WN, SO, BL, Plate, Thread, Socket and ... the high hubFlange. It is designedto transfer stresses to the pipe, thereby reducing high stress concentration sat the base of ... its inherent structuralvalue. It is expensive because of the design. Pipe Fittings