BS 10 (Tables D, E, F, H) & BS 4504 British flange standard guide: imperial bolt circles, metric PN ratings, dimensions, material options. Quote in 30 min.
BS 10 and BS 4504 are historical British standards widely specified across Commonwealth countries, UK infrastructure, water authorities, and marine vessels.
BS 10 specifies imperial British standard pipe flanges (Table D, E, F, H), while BS 4504 specifies metric circular steel flanges (PN 6 to PN 40).
Under BS 10 / BS 4504 Flange Standard, flange sealing face finishes are critical to leak-free joint integrity. Raised Face (RF) and Flat Face (FF) flanges are machined with a serrated concentric or serrated spiral finish having an average surface roughness between 125 µin and 250 µin (3.2 µm to 6.3 µm Ra), creating an ideal gripping surface for spiral wound or non-asbestos sheet gaskets.
For severe cyclic service or high-pressure hydrocarbons, Ring Type Joint (RTJ) grooves are precision CNC-machined to ASME B16.20 standards. Groove surfaces are finished to a mirror-smooth 63 µin (1.6 µm Ra) max roughness to ensure tight metallic sealing against octagonal or oval ring gaskets.
Compliance with BS 10 / BS 4504 Flange Standard requires permanent identification legibly stamped on the outer rim of every flange: manufacturer trademark ("REMAX"), governing standard, nominal pipe size (NPS or DN), pressure rating class (e.g. 150#, 300#, 600#), ASTM/ASME material specification and grade (e.g. A105, F316L), schedule/wall thickness, and unique heat batch number.
All markings correlate 1:1 with the accompanying EN 10204 Type 3.1 Mill Test Certificate (MTC), providing verified traceability back to the initial steel melting ladle and forging ingot.
A: BS 10 Table E is the most widely specified imperial British flange table for general municipal water distribution lines up to 100 psi working pressure.
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