Stainless Steel Weld Neck Flange 304
AISI 304 weld-neck flanges for butt-welded, high-integrity stainless connections under pressure and cyclic load. The tapered hub improves stress distribution compared with plate flanges on critical process lines. Quoted and sold per piece.
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Applications & Selection Guide
Stainless steel weld-neck flanges in AISI 304 to EN 1092-1 Type 11 — tapered hub butt-welded to the pipe, matching bore, and raised gasket face for maximum joint integrity in stainless systems.
Weld-necks are used on stainless process lines, steam and hot-water service, and cyclic or vibrating duty where the hub's smooth stress transfer prevents fatigue at the flange weld. State the pipe wall at order so the hub bore matches. Select the PN class and DN from the table above; for chloride environments consider 316L equivalents.
Quoted and sold per piece. Include PN, DN, pipe wall, quantity, and delivery country in your quote request for exact pricing and lead time.
Listed sizes are PN16 DN20, DN125 and DN250. Their connection dimensions follow EN 1092-1: DN20 has a 105 mm outside diameter, 75 mm bolt circle and 4 × M12 bolts; DN125 has 250 mm, 210 mm and 8 × M16; DN250 has 405 mm, 355 mm and 12 × M24. The hub is welded to pipe of 26.9, 139.7 and 273 mm outside diameter.
Technical guides
304 vs 316 stainless steel: composition, strength, corrosion resistance and when to use each
How 304 (1.4301) and 316 (1.4401/1.4404) stainless steel differ in composition, PREN, strength and chloride resistance, what the L grades and A2/A4 fasteners mean, and which grade to choose.
Read the guide →Flange dimensions: EN 1092-1 PN6 to PN40 and ASME B16.5 Class 150 and 300
Flange dimension tables for EN 1092-1 PN6, PN10, PN16, PN25 and PN40 and ASME B16.5 Class 150 and 300: outside diameter, bolt circle, number and size of bolts, and why PN and Class flanges do not mate.
Read the guide →Product Information
Material Grade
AISI 304
Manufacturing Standard
EN 1092-1
Material Type
Stainless Steel
Category
Weld Neck Flange
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