{"id":862,"date":"2026-04-09T12:36:34","date_gmt":"2026-04-09T04:36:34","guid":{"rendered":""},"modified":"2026-04-09T23:40:12","modified_gmt":"2026-04-10T03:40:12","slug":"flange-face-types-rf-ff-rtj-mfm-guide","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/de\/2026\/04\/09\/flange-face-types-rf-ff-rtj-mfm-guide\/","title":{"rendered":"Flange Face Types Explained: RF vs FF vs RTJ vs MFM"},"content":{"rendered":"<figure class=\"flange-image\"><\/figure>\n<h1>Flange Face Types Explained: RF vs FF vs RTJ vs MFM<\/h1>\n<p><strong>Flange face type<\/strong> determines the sealing method and is critical for leak-free operation. Choosing the wrong face type can result in gasket failure and dangerous leaks.<\/p>\n<h2>Raised Face (RF)<\/h2>\n<p><strong>Most common flange face type.<\/strong> The gasket sits on a raised surface (1\/16&#8243; for Class 150-300, 1\/4&#8243; for Class 400+).<\/p>\n<ul>\n<li><strong>Pressure Range:<\/strong> Class 150 to 2500<\/li>\n<li><strong>Gasket Types:<\/strong> Non-metallic, spiral wound, ring joint<\/li>\n<li><strong>Applications:<\/strong> Oil &amp; gas, chemical, water, general service<\/li>\n<li><strong>Standards:<\/strong> ASME B16.5, DIN 2501<\/li>\n<\/ul>\n<h2>Flat Face (FF)<\/h2>\n<p><strong>Full-face gasket contact.<\/strong> Entire flange surface is flat, used when one flange is cast iron or brittle material.<\/p>\n<ul>\n<li><strong>Pressure Range:<\/strong> Class 125, 250 (cast iron)<\/li>\n<li><strong>Gasket Types:<\/strong> Full-face gaskets<\/li>\n<li><strong>Applications:<\/strong> Water treatment, HVAC, low-pressure<\/li>\n<\/ul>\n<h2>Ring Type Joint (RTJ)<\/h2>\n<p><strong>Metal-to-metal sealing.<\/strong> Groove accepts metal ring gasket for high-pressure, high-temperature service.<\/p>\n<ul>\n<li><strong>Pressure Range:<\/strong> Class 600 to 2500<\/li>\n<li><strong>Gasket Types:<\/strong> Oval or octagonal metal rings<\/li>\n<li><strong>Applications:<\/strong> Offshore, high-pressure steam, refinery<\/li>\n<li><strong>Ring Designs:<\/strong> R, RX, BX series<\/li>\n<\/ul>\n<h2>Male-Female Face (MFM)<\/h2>\n<p><strong>Self-aligning design.<\/strong> One flange has raised face, mating flange has matching recess.<\/p>\n<ul>\n<li><strong>Pressure Range:<\/strong> Class 150 to 2500<\/li>\n<li><strong>Gasket Types:<\/strong> Ring gaskets<\/li>\n<li><strong>Applications:<\/strong> Pump connections, frequent disassembly<\/li>\n<\/ul>\n<h2>Tongue-and-Groove (T&amp;G)<\/h2>\n<p><strong>Precision alignment.<\/strong> Tongue on one flange fits into groove on mating flange.<\/p>\n<ul>\n<li><strong>Pressure Range:<\/strong> Class 150 to 2500<\/li>\n<li><strong>Applications:<\/strong> Valve bonnets, specialty equipment<\/li>\n<\/ul>\n<h2>Face Type Selection Chart<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Service Condition<\/th>\n<th>Recommended Face<\/th>\n<\/tr>\n<tr>\n<td>General Purpose<\/td>\n<td>Raised Face (RF)<\/td>\n<\/tr>\n<tr>\n<td>Hoher Druck<\/td>\n<td>RTJ<\/td>\n<\/tr>\n<tr>\n<td>Cast Iron Piping<\/td>\n<td>Flat Face (FF)<\/td>\n<\/tr>\n<tr>\n<td>Frequent Maintenance<\/td>\n<td>MFM or T&amp;G<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"quote-box\">\n<h3>\ud83d\udcde Request Flange Catalog<\/h3>\n<p><strong>WhatsApp:<\/strong> +86-18658777855<\/p>\n<p><strong>E-Mail:<\/strong> 1007788887@qq.com<\/p>\n<p><a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" title=\"\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Complete guide to flange face types. Learn RF, FF, RTJ, MFM, T&#038;G differences and select the right sealing surface for leak-free operation.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-862","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/posts\/862","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/comments?post=862"}],"version-history":[{"count":3,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/posts\/862\/revisions"}],"predecessor-version":[{"id":902,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/posts\/862\/revisions\/902"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/media?parent=862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/categories?post=862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/de\/wp-json\/wp\/v2\/tags?post=862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}