Stainless Steel Flanges

Flange procurement is controlled by type, class, dimensional standard, facing and matching bore as well as the ordered stainless grade. Weld-neck, slip-on, blind, socket-weld, threaded, lap-joint and plate flanges serve different connection details. A purchase description should name the flange type, NPS, pressure class and dimensional standard before material is evaluated. For larger diameters, also identify the applicable standard series where it changes dimensions; pressure class alone does not establish one universal flange geometry.

Keep the material product standard separate from the dimensional standard. ASTM A182/A182M may govern forged stainless material while ASME B16.5 or B16.47 controls many flange dimensions. A project may restrict forged versus plate manufacture, heat treatment, grain flow, examinations or repairs. Do not assume a plate-cut route can replace a forged requirement because the shape appears similar. State grade, product specification and permitted manufacturing route, then add any project-specific testing, PMI, corrosion testing or witness requirements before sourcing.

Connection details must match the adjoining pipe, gasket and bolting design. Define raised face, flat face, ring-type joint or other facing; gasket-contact surface finish; weld-neck bore or matching pipe schedule; hub and weld-end details; and bolt drilling where the standard does not fully resolve the requirement. Slip-on and lap-joint arrangements have their own bore and companion-component questions. Special facing, drilling or bore work should be tied to a drawing and revision so final machining can be inspected against the intended assembly.

Send the inspection document, marking format and any dimensional or NDE report with the RFQ. We quote rigid face protectors, piece-level identification for mixed classes and packing matched to unit weight.