Socket Weld flanges have a machined pocket that receives the pipe end, fillet-welded for small-bore high-pressure piping -- no butt weld preparation needed.
Socket Weld (SW) flanges have a machined pocket or socket that receives the pipe end. The pipe is inserted into the socket and fillet-welded in place. SW flanges use a machined pocket that receives the pipe end; pipe is fillet-welded in place. No precise butt-weld end preparation needed. SW flanges are used for small-bore piping (typically NPS 2 and below) in high-pressure services.
SW flanges are available in ASME B16.5 pressure classes Class 150 through Class 2500. Supply is reviewed per inquiry against standard, pressure class, NPS, grade and facing.
Reviewed against your required standard, pressure class and nominal pipe size.
ASME B16.5 is the primary standard for SW flange dimensions and pressure-temperature ratings. Socket dimensions per ASME B16.11 for socket weld fittings.
Class 150 through Class 2500 in ASME B16.5. Most commonly used for small-bore high-pressure services.
Industry Standard: NPS ½ through NPS 2 per ASME B16.5 for socket weld flanges.
Custom Manufacturing: Larger sizes above NPS 2 evaluated per socket machining capacity.
Actual Supply Availability: Confirmed per inquiry against grade, pressure class and schedule.
Small-bore high-pressure connections in hydraulic and pneumatic systems.
Precision small-bore connections for process instrumentation and analyzer piping.
Corrosion-resistant small-bore sample and reagent lines in chemical plants.
SW flanges are most commonly produced for NPS 1/2 through NPS 2. Larger sizes are less common and must be evaluated per inquiry.
SW flanges are welded (fillet weld, Class 300+) and suitable for higher pressure. Threaded flanges are not welded (Class 150/300 typically) and are for low-pressure non-critical service. Choose SW when pressure exceeds what threaded can handle, or when vibration and temperature cycling are present.
Socket dimensions for socket weld fittings follow ASME B16.11. SW flanges are typically produced for NPS ½ to NPS 2; larger sizes are custom evaluated. The socket bore is machined to accept the pipe outer diameter with a standard fillet weld gap.
Please specify the standard (e.g., ASME B16.5), pressure class, nominal pipe size (NPS), grade, facing and quantity. We will confirm availability and supply conditions. For drawing-based or custom requirements, you may share your drawings with our sales team by email or WhatsApp after initial contact. Include material grade, dimensions, tolerances, quantity and drawing reference.
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