A metal flange is a protruding rim or collar used to connect pipes, valves, pumps, and other equipment to form a piping system, providing strength and preventing leaks.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Face Type | Raised face (RF), Flat face (FF), Ring-type joint (RTJ) | |
| Thickness | Varies by pressure class and material | |
| Nominal Size | DN 50 to DN 500 (or NPS 2" to 20") | |
| Surface Finish | 125-250 microinches Ra for gasket seating | |
| Pressure Rating | PN 6 to PN 40 (or Class 150 to Class 300) | |
| Bolt Circle Diameter | As per ASME B16.5 or DIN standards |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
A practical evidence checklist for RFQ preparation and supplier evaluation.
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3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
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In a viewport, a flange secures the transparent window (e.g., glass or polycarbonate) to the equipment housing, ensuring a sealed enclosure that allows visual monitoring while maintaining pressure, vacuum, or containment integrity.
Choose based on operating conditions: carbon steel for general service, stainless steel for corrosive environments, alloy steel for high temperatures, and consider factors like pressure, temperature, fluid type, and cost.
Raised face (RF) for most applications, flat face (FF) for low pressure, and ring-type joint (RTJ) for high-pressure/temperature services. The face type affects gasket selection and sealing performance.
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