{"id":567,"date":"2026-02-24T16:52:05","date_gmt":"2026-02-24T11:22:05","guid":{"rendered":"https:\/\/www.absteel.in\/blog\/?p=567"},"modified":"2026-02-24T16:52:05","modified_gmt":"2026-02-24T11:22:05","slug":"threaded-flange-types","status":"publish","type":"post","link":"https:\/\/www.absteel.in\/blog\/threaded-flange-types\/","title":{"rendered":"Threaded Flange Types: A Complete Guide"},"content":{"rendered":"<div class=\"ttr_start\"><\/div>\n<p>Threaded flanges are widely used piping components designed to connect pipes without welding. These flanges have internal threads that match the external threads of a pipe, allowing easy installation and removal. They are especially useful in low-pressure and non-critical applications where welding may not be feasible.<\/p>\n\n\n\n<p>In this complete guide, we will explore what threaded flanges are, their types, materials, applications, advantages, and selection criteria.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is a Threaded Flange?<\/strong><\/h2>\n\n\n\n<p>A <strong><a href=\"https:\/\/www.absteel.in\/flanges-products.html\">threaded flange<\/a><\/strong>, also known as a screwed flange, features internal threads that <strong>engage directly with a corresponding pipe\u2019s matching external threads<\/strong> without welding.<\/p>\n\n\n\n<p>The threading standard that is widely used is <strong>NPT (National Pipe Thread)<\/strong>, while BSP threading is available for specific regional and project requirements. These flanges perform better in low-pressure, small-diameter piping systems. They are suitable for hazardous environments where <strong>hot work permits are either restricted or not available<\/strong> sectors like chemical plants, gas distribution lines, and fire suppression systems being prime examples.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Types of Threaded Flanges<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Raised Face Threaded Flange (RF)<\/strong><\/h3>\n\n\n\n<p>The<strong> RF threaded flange is a commonly used flange type in the industry.<\/strong> The raised face features a load on the gasket to a smaller seating area, thus creating a tighter seal. Inadequate maintenance of seating stress in these designs will impair the seal, potentially leading to <strong>seal compromise<\/strong>, gasket blowout or uncontrolled fugitive emissions during pressure transients. The arrangement works over a wide range of gasket materials, such as spiral-wound, ring, and soft-cut gaskets, thereby offering procurement flexibility and installation versatility without complicating purchasing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Flat Face Threaded Flange (FF)<\/strong><\/h3>\n\n\n\n<p>Flat-face flanges carry a full-face seating surface. These are used specifically with cast iron and ductile iron mating flanges, where a raised face would introduce unacceptable bending stress across the bolt circle. Low-pressure applications dominate here \u2013 water supply infrastructure, utility distribution, and general plant services. Using an RF flange against a cast iron body risks cracking the weaker material. Flat face eliminates that problem at the source.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Ring Type Joint Threaded Flange (RTJ)<\/strong><\/h3>\n\n\n\n<p>RTJ threaded flange is <strong>used in high-pressure oilfield services and refineries<\/strong>, as it is built for conditions where pressure and temperature both push into demanding territory. The face carries a precision-machined groove that seats a solid metal ring gasket with an oval or octagonal cross-section. Under bolt load, the gasket deforms slightly and creates an exceptionally tight metal-to-metal seal. We supply RTJ threaded flanges into refineries, offshore platforms, and high-pressure wellhead systems. This is not a general-purpose flange; it is the correct choice when operating conditions rule out softer sealing methods.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Custom and Special Threaded Flanges<\/strong><\/h3>\n\n\n\n<p>Standard catalogue sizes do not cover every project requirement. We manufacture threaded flanges in <strong>duplex (UNS S31803), super duplex (UNS S32750), Inconel, and high-alloy steel grades<\/strong> for projects with aggressive corrosion requirements, cryogenic service, or non-standard pressure ratings. Sizes, bore tolerances, and thread specifications are produced against client drawings or project specifications. If the application exists outside standard ASME tables, we build to it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Choose AB Steel for Threaded Flanges?<\/strong><\/h2>\n\n\n\n<p>AB Steel functions as a technically competent manufacturer and supplier, delivering <strong>ASTM- and ASME-compliant<\/strong> threaded flanges that function in the most adverse operational transients. The manufacturing plant is set up for extreme dimensional accuracy to ensure that, whether NPT or BSP, it meets precise taper requirements to avoid galling and seal integrity issues for all pressure ratings. The company also maintains a substantial material inventory, from carbon steel to exotic materials, to mitigate severe pitting and stress corrosion cracking in high-risk applications.<\/p>\n\n\n\n<p>Each manufacturing lot is subject to rigorous quality verification, including <strong>Positive Material Identification (PMI), dimensional verifications, and hydrostatic testing<\/strong>, to guarantee the integrity of the pressure boundary before shipment. The company also supports custom designs and non-standard specifications with competitive pricing and rapid delivery schedules for both local and international sales. With our precision machining, full material traceability, and the ability to provide a <strong>Mill Test Certificate (MTC)<\/strong>, AB Steel provides the metallurgical integrity required for major infrastructure projects around the globe.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Selecting the correct threaded flange type is a technical decision \u2013 not a procurement afterthought. The face type, pressure class, material grade, and thread specification must align with your system&#8217;s actual operating conditions. Get one of those wrong, and you are looking at leaks, premature joint failure, or a safety incident.<\/p>\n\n\n\n<p>We at AB Steel provide the full technical support needed to make that selection correctly the first time. Contact our technical team today for a detailed quotation, bulk order pricing, or specification review for your project requirements.<\/p>\n<div class=\"ttr_end\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Threaded flanges are widely used piping components designed to connect pipes without welding. These flanges have internal threads that match the external threads of a pipe, allowing easy installation and removal. They are especially useful in low-pressure and non-critical applications where welding may not be feasible. In this complete guide, we will explore what threaded &#8230; <a title=\"Threaded Flange Types: A Complete Guide\" class=\"read-more\" href=\"https:\/\/www.absteel.in\/blog\/threaded-flange-types\/\" aria-label=\"More on Threaded Flange Types: A Complete Guide\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":568,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-567","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-flanges-blogs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Threaded Flange Types: A Complete Guide<\/title>\n<meta name=\"description\" content=\"In this complete guide, we will explore what threaded flanges are, their types, materials, applications, advantages, and selection criteria.\" \/>\n<meta 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