The BS 4504 Stainless Steel Weld Neck Flange is a British standard specification for circular flanges for pipes, valves, and fittings. Although largely superseded by EN 1092-1, it remains a critical reference for legacy systems and specific Commonwealth projects. These flanges feature a tapered hub for butt-welding, offering exceptional resistance to corrosion and thermal expansion. Common in chemical and food processing, they ensure high-integrity seals in pressure ratings from PN 2.5 to PN 40.
Technical Attributes: BS 4504 Stainless Steel WN
Standard,BS 4504 (Part 1 for Steel)
Flange Type,Code 111 (Weld Neck)
Material Grades,"316L, 304L, 321, 310S"
Pressure Ratings,"PN 6, PN 10, PN 16, PN 25, PN 40"
Nominal Size,DN 10 to DN 2000+
Connection Type,Butt-welded (Tapered Hub)
Face Types,"Raised Face (RF), Flat Face (FF)"
Surface Finish,125–250 Ra (Standard)
Corrosion Resistance,Excellent (Pitting/Crevice resistant)
Manufacturing,Forged or Machined from Plate
Transition,Tapered hub to match pipe wall
Weld Prep,37.5° Bevel (Standard)
Drilling,Metric bolt patterns
Heat Treatment,Solution Annealing (for Stainless)
Certification,BS EN 10204 3.1
Legacy Status,Replaced by BS EN 1092-1
Applications,"Marine, Chemical, Food & Beverage"
Sealing,Compatible with Non-asbestos/PTFE
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
