Cangzhou Avant International Trade Co., Ltd. is one of the leading manufacturers and suppliers of screwed flange in China. We are committed to providing high quality customized products with competitive price. Welcome to wholesale cheap screwed flange in stock here from our factory. Also, free sample is available.
Screwed flanges are machined from solid forgings and feature tapered internal threads; installation involves screwing the externally threaded pipe into the flange body and then bolting two flanges together with a gasket to complete the connection. Their primary advantage is the elimination of welding: there is no need to transport welding equipment or consumables, nor is a hot-work permit required, resulting in rapid on-site assembly. They also facilitate convenient disassembly during future maintenance or system modifications, allowing for flange reuse provided the components remain undamaged. However, this product is generally suitable only for small-bore pipelines ranging from DN10 to DN100; at larger diameters, stress distribution on the threads deteriorates and the risk of leakage increases significantly, so threaded flanges are rarely selected for large-diameter projects.
Regarding product details and quality control, high-quality screwed flanges demand strict precision in internal thread machining. Prior to installation, the pipe ends must be ground smooth and cleared of burrs and rust, and the threading must be properly aligned and complete-with the total length of broken or missing threads not exceeding 10% of the full thread length.
Effective sealing is critical to the integrity of threaded connections; installers must select the appropriate gasket or PTFE tape based on the medium and pressure, and apply anti-seize compound or white lead paste to the threads. Before shipment, we rigorously inspect thread tolerances and sealing surface roughness, providing comprehensive quality traceability documentation that includes material certificates and dimensional inspection reports. We are committed to providing full-lifecycle technical support; should any questions arise during installation or sealing, our dedicated technical team will provide professional guidance within 24 hours.
Our screwed flanges are compatible with major international engineering standards and local project specifications, including ASME B16.5 (US), EN 1092-1 (EU), GB/T9112 (China), and the HG/T20592/HG/T20615 chemical industry standards. Thread specifications can be customized to include common types such as NPT and BSPT; this is crucial, as incompatible thread systems cannot be interchanged, and an incorrect choice can prevent effective sealing after assembly. Pressure ratings range from PN6 to PN40, with a primary focus on ASME Class 150 and Class 300. The standard sealing face is Raised Face (RF), though Flat Face (FF) options are available upon request to accommodate various non-metallic gaskets.
We offer a wide range of materials, with stable supplies of carbon steels (A105, 20#, Q235) and stainless steels (304, 316L, 321). Screwed flanges offer a practical solution for difficult-to-weld alloy steels, effectively bypassing welding challenges. All blanks are integrally forged, and threads undergo precision machining to ensure uniform profiles and minimize the risk of thread stripping or binding during assembly. Products undergo rigorous inspections-covering appearance, dimensions, and thread specifications-before shipment. Material Test Reports (MTR) are available upon request to meet material traceability requirements for overseas EPC projects. Carbon steel screwed flanges can be treated with anti-rust oil or black paint to prevent corrosion during ocean transport, and protective sleeves are fitted over the threaded sections.
Many overseas clients compare screwed flanges with slip-on flanges. Slip-on flanges are secured to the pipe via fillet welds, making them suitable for low-pressure lines where hot work is permitted. In contrast, screwed flanges require no welding but are subject to limitations regarding pipe diameter and operating conditions; they are better suited for auxiliary piping such as instrument sampling ports, fire protection lines, compressed air systems, and low-pressure water supply lines. When on-site hot work is restricted, pipe diameters are relatively small, and operating pressure is stable, threaded flanges offer a more cost-effective solution for the overall installation.
If you are seeking a reliable supplier of threaded flanges or require assistance in selecting the right specifications based on your project's operating conditions, please share the project standards, nominal bore, thread type, material, and pressure parameters. Our technical team will promptly evaluate your requirements and provide a suitable proposal and quotation.
Hot Tags: screwed flange, China screwed flange manufacturers, suppliers, factory
