BS 4504 is a legacy British standard for circular flanges, now largely harmonized with EN 1092-1 but still widely referenced in the UK and Commonwealth maintenance sectors. The Slip-On forged steel flange is designed to slide over the pipe and is secured with double fillet welds. These flanges are used in water supply, low-pressure steam, and industrial plumbing. They offer a reliable, cost-effective connection with precise bolt hole alignment, manufactured from robust forged carbon steel for longevity.
Technical Attributes
Standard: BS 4504
Flange Type: Code 101 Slip-On
Material Grade: Forged Carbon Steel
Pressure Rating: PN 6 to PN 40
Size Range: DN 10 to DN 2000
Manufacturing: Forged Steel
Facing Type: Raised Face RF
Surface Finish: Machined Serrated
Connection: Double Fillet Weld
Yield Strength: Min 235 MPa
Tensile Strength: 360-500 MPa
Carbon Content: Max 0.25 percent
Heat Treatment: Normalized
Service Temp: -10C to 300C
Dimensional Row: Table Based (PN)
Drilling: Metric Bolt Holes
Certification: EN 10204 3.1
Primary Industry: UK Infrastructure
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