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Home – Flanges – Weld Neck Flange – Flange Type Selector — Is a Weld Neck Right for Your Line? Flange Type Selector — Is a Weld Neck Right for Your Line? Answer three questions about your service and we’ll point to the flange type that fits — including when a cheaper slip-on is the honest choice. Pressure Class Class 150 Class 300 Class 600 and above Service Condition Ambient, steady, non-critical Thermal cycling / vibration High temperature (steam) Hazardous / critical fluid Pipe Size Above 2″ (NPS) 2″ and below (small bore) Weld Neck Flange — Get a Spec-Matched Quote