High-Quality Stainless Steel Flanges – ASME B16.5 & B16.47 Manufacturer
Our comprehensive inventory features key configurations including weld neck, slip-on, blind, threaded, socket weld, and lap joint flanges tailored to your exact pressure and connection needs. Beyond standard dimensions, we also support full product customization through precision welding and forming based on your technical drawings.
Overview
As a premier stainless steel flange manufacturer, S&S Stainless International provides a complete selection of flanges engineered for durability, corrosion resistance, and high performance in demanding industrial environments. We adhere strictly to international standards, including ASME B16.5 and ASME B16.47, ensuring that every flange meets the highest quality and safety specifications.
Whether you need flanges for high-pressure systems, corrosive pipelines, or general piping applications, our extensive inventory covers a wide range of sizes, pressure classes, material grades, and flange facing types to suit your specific project requirements.
flange introduction
Weld Neck Flange: Stainless steel weld neck flanges are designed for high-pressure, high-temperature, and sub-zero applications. Their tapered hub provides a smooth transition from the flange to the pipe, reducing stress concentration. Ideal for critical process piping.
Slip-On Flange: Stainless steel slip-on flanges are a cost-effective, easy-to-install solution for lower-pressure applications. They simply slide over the pipe before being welded, offering convenience without compromising seal integrity.
Blind Flange: Stainless steel blind flanges seal off the end of a piping system or block a nozzle opening on a pressure vessel. They are crucial for isolating sections of pipe for maintenance or future expansion.
Threaded Flange: Also known as screwed flanges, stainless steel threaded flanges are used in non-welded applications where welding is impractical or undesirable. They feature a threaded bore that matches the pipe thread, allowing for quick assembly.
Socket Weld Flange: Stainless steel socket weld flanges are commonly used for small pipe sizes and high-pressure systems. The pipe is inserted into a socket, and a fillet weld is applied around the hub, providing excellent strength and leak prevention.
Lap Joint Flange: Stainless steel lap joint flanges are paired with stub ends and are ideal for applications requiring frequent dismantling for inspection or maintenance. They allow for easy alignment of bolt holes, reducing installation time and stress on the piping system.
Flange Facing Types: Ensuring Optimal Sealing
The choice of flange facing type is critical for achieving a leak-tight seal in any piping system. It dictates the gasket type and the overall integrity of the connection. At S&S Stainless International, we manufacture and supply stainless steel flanges with a variety of facing types to meet diverse operational demands:
- Raised Face (RF) Flange
- The Raised Face flange is the most common type, featuring a raised gasket surface above the bolting circle. This concentrates the bolting force on a smaller gasket area, providing a stronger seal. RF flanges are suitable for various pressures and temperatures and are typically used with non-metallic flat gaskets or spiral wound gaskets.
- Flat Face (FF) Flange
- Flat-face flanges have a gasket surface in the same plane as the bolting circle face. They are primarily used when connecting to cast iron valves, fittings, and pumps that are easily damaged by the bending stresses generated by a Raised-Face flange. FF flanges typically use full-face gaskets.
- Ring Type Joint (RTJ) Flange
- Ring-type joint flanges are designed for high-pressure, high-temperature, and highly corrosive applications. They feature a precisely machined groove into which a metallic ring gasket (often oval or octagonal in cross-section) is fitted. The metal-to-metal contact between the ring gasket and the grooves provides an extremely strong and reliable seal.
- Male and Female (M&F) Flange
- The Male and Female flange facing involves one flange having a “male” (raised) section and the mating flange having a corresponding “female” (recessed) section. This configuration helps to accurately align the flanges and provides a larger contact area for the gasket, preventing blowout.
- Tongue and Groove (T&G) Flange
- Similar to M&F, Tongue and Groove flanges also have a male-female type of fit, but the contact surfaces are smaller. One flange has a raised “tongue”, and the other has a matching “groove.” This design provides excellent gasket retention and is often used for specific gasket materials or applications where gasket blowout is a concern.
By offering various flange facing types, we ensure compatibility with diverse piping components and provide solutions optimized for different operational pressures, temperatures, and media.
Adhering to Global Standards: ASME B16.5 & ASME B16.47
As a dedicated stainless steel flange manufacturer, we ensure that our products meet the stringent requirements of industry standards. Our manufacturing processes and quality control systems are compliant with:
- ASME B16.5 Flanges: This standard covers pipe flanges and flanged fittings from NPS 1/2 through NPS 24 for various pressure classes. It dictates dimensions, tolerances, marking, materials, pressure-temperature ratings, and testing.
- ASME B16.47 Flanges: This standard covers large diameter steel pipe flanges from NPS 26 through NPS 60. It includes two series of flanges: Series A (MSS SP-44) and Series B (API 605), both addressing pressure-temperature ratings, dimensions, materials, and bolting requirements.
Our commitment to these standards guarantees that you receive flanges of consistent quality, precise dimensions, and reliable performance.
Why Choose S&S Stainless International
Comprehensive Product Range
From common types to specialized designs, we stock a wide array of stainless steel flanges, including all major flange facing types.
Expert Support from S&S
Our team of experts is ready to assist you in selecting the right flange for your application.
High-Quality Standards
Every flange undergoes rigorous quality checks and comes with full material certification.
Global Presence and Support
With 30 years of experience as YES Stainless, S&S Stainless International is well-positioned to serve clients worldwide.
FAQs
1. What flange types, pressure ratings, and facings do you manufacture and supply?
We supply a full range of stainless steel flange types—including Weld Neck, Slip-On, Blind, Threaded, Socket Weld, and Lap Joint—in sizes from 1/2 inch to 60 inches. Our flanges cover pressure classes from 150# to 2500# (PN6 to PN400) and are available in various facing types, including Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ), to match your exact pipeline specifications.
2. Which international material and dimensional standards do your flanges comply with?
All our flanges are manufactured in strict compliance with major global standards, including ANSI/ASME B16.5, ASME B16.47 (Series A & B), EN 1092-1, DIN, and JIS. Material grades primarily cover ASTM A182 F304/304L and F316/316L, as well as duplex and high-alloy grades upon request. Each shipment includes full EN 10204 3.1 Material Test Reports (MTRs) to guarantee raw material traceability and mechanical compliance.
3. Do you accept third-party inspection (TPI) and custom flange fabrication based on technical drawings?
Yes. We routinely accommodate Third-Party Inspection (TPI) by independent agencies such as SGS, BV, TÜV, or Lloyd’s Register before dispatch. Additionally, if your project requires non-standard dimensions, special hub lengths, custom bolt hole patterns, or specialized welding and forming, our engineering team can manufacture custom flanges directly from your CAD or technical drawings.
4. How do you handle export packaging, export documentation, and international shipping logistics?
To protect flange sealing faces during long-distance transit, all flanges are fitted with protective plastic end caps, treated with anti-rust protection, and packaged in seaworthy, ISPM-15 compliant heat-treated wooden cases or crates. Our international trade team manages complete export documentation—including Certificates of Origin, Form E, packing lists, commercial invoices, and MTRs—and supports FOB, CFR, and CIF shipping terms to your preferred destination port.