{"id":1587,"date":"2026-04-13T02:26:08","date_gmt":"2026-04-13T09:26:08","guid":{"rendered":"https:\/\/www.songhaiflanges.com\/?p=1587"},"modified":"2026-04-13T02:34:11","modified_gmt":"2026-04-13T09:34:11","slug":"asme-b16-5-flange-dimensions-complete-size-chart-and-selection-guide","status":"publish","type":"post","link":"https:\/\/www.songhaiflanges.com\/ms\/asme-b16-5-flange-dimensions-complete-size-chart-and-selection-guide\/","title":{"rendered":"ASME B16.5 Flange Dimensions: Complete Size Chart and Selection Guide"},"content":{"rendered":"<h2>Introduction<\/h2>\n<p>Understanding <strong>ASME B16.5 flange dimensions<\/strong> is essential for engineers, procurement specialists, and piping contractors. This comprehensive guide provides detailed dimension tables, pressure class specifications, and practical selection criteria for pipe flanges ranging from 1\/2 inch to 24 inch nominal pipe size.<\/p>\n<h2>ASME B16.5 Standard Overview<\/h2>\n<h3>What Is ASME B16.5?<\/h3>\n<p>ASME B16.5 is the American National Standard that covers:<\/p>\n<ul>\n<li>Pipe flanges and flanged fittings<\/li>\n<li>NPS 1\/2 through NPS 24<\/li>\n<li>Pressure classes 150, 300, 400, 600, 900, 1500, and 2500<\/li>\n<li>Materials including carbon steel, stainless steel, and alloy steel<\/li>\n<\/ul>\n<h2>Pressure Class Designations<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Class<\/th>\n<th>Designation<\/th>\n<th>Typical Application<\/th>\n<\/tr>\n<tr>\n<td>150<\/td>\n<td>Class 150<\/td>\n<td>Low pressure, general service<\/td>\n<\/tr>\n<tr>\n<td>300<\/td>\n<td>Class 300<\/td>\n<td>Medium pressure systems<\/td>\n<\/tr>\n<tr>\n<td>600<\/td>\n<td>Class 600<\/td>\n<td>High pressure pipelines<\/td>\n<\/tr>\n<tr>\n<td>900<\/td>\n<td>Class 900<\/td>\n<td>Critical process systems<\/td>\n<\/tr>\n<tr>\n<td>1500<\/td>\n<td>Class 1500<\/td>\n<td>Extreme pressure conditions<\/td>\n<\/tr>\n<tr>\n<td>2500<\/td>\n<td>Class 2500<\/td>\n<td>Maximum pressure ratings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Class 150 Flange Dimensions<\/h2>\n<table>\n<tbody>\n<tr>\n<th>NPS<\/th>\n<th>OD (mm)<\/th>\n<th>Bolt Circle (mm)<\/th>\n<th>Bolt Holes<\/th>\n<th>Bolt Size<\/th>\n<th>Thickness (mm)<\/th>\n<\/tr>\n<tr>\n<td>1\/2 inch<\/td>\n<td>89<\/td>\n<td>60<\/td>\n<td>4<\/td>\n<td>M12<\/td>\n<td>11<\/td>\n<\/tr>\n<tr>\n<td>1 inch<\/td>\n<td>108<\/td>\n<td>79<\/td>\n<td>4<\/td>\n<td>M12<\/td>\n<td>14<\/td>\n<\/tr>\n<tr>\n<td>2 inch<\/td>\n<td>152<\/td>\n<td>121<\/td>\n<td>4<\/td>\n<td>M16<\/td>\n<td>16<\/td>\n<\/tr>\n<tr>\n<td>4 inch<\/td>\n<td>229<\/td>\n<td>191<\/td>\n<td>8<\/td>\n<td>M16<\/td>\n<td>19<\/td>\n<\/tr>\n<tr>\n<td>6 inch<\/td>\n<td>279<\/td>\n<td>241<\/td>\n<td>8<\/td>\n<td>M20<\/td>\n<td>21<\/td>\n<\/tr>\n<tr>\n<td>8 inch<\/td>\n<td>343<\/td>\n<td>298<\/td>\n<td>8<\/td>\n<td>M20<\/td>\n<td>24<\/td>\n<\/tr>\n<tr>\n<td>12 inch<\/td>\n<td>483<\/td>\n<td>432<\/td>\n<td>12<\/td>\n<td>M24<\/td>\n<td>25<\/td>\n<\/tr>\n<tr>\n<td>24 inch<\/td>\n<td>813<\/td>\n<td>749<\/td>\n<td>20<\/td>\n<td>M36<\/td>\n<td>37<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Flange Face Types<\/h2>\n<h3>Raised Face (RF)<\/h3>\n<ul>\n<li>Most common configuration<\/li>\n<li>1.6mm (1\/16 inch) for Class 150-300<\/li>\n<li>6.4mm (1\/4 inch) for Class 400 and above<\/li>\n<li>Suitable for most gasket types<\/li>\n<\/ul>\n<h3>Ring Type Joint (RTJ)<\/h3>\n<ul>\n<li>Metal-to-metal sealing<\/li>\n<li>High pressure applications<\/li>\n<li>Classes 600 and above<\/li>\n<li>Requires precision machining<\/li>\n<\/ul>\n<h2>Material Specifications<\/h2>\n<h3>Carbon Steel Flanges:<\/h3>\n<ul>\n<li><strong>ASTM A105<\/strong> &#8211; Forged carbon steel<\/li>\n<li><strong>ASTM A350 LF2<\/strong> &#8211; Low temperature service<\/li>\n<li><strong>ASTM A694<\/strong> &#8211; High strength carbon steel<\/li>\n<\/ul>\n<h3>Stainless Steel Flanges:<\/h3>\n<ul>\n<li><strong>ASTM A182 F304\/F304L<\/strong> &#8211; General corrosion resistance<\/li>\n<li><strong>ASTM A182 F316\/F316L<\/strong> &#8211; Enhanced corrosion resistance<\/li>\n<li><strong>ASTM A182 F321<\/strong> &#8211; Stabilized for welding<\/li>\n<\/ul>\n<h2>Conclusion<\/h2>\n<p>Proper selection of ASME B16.5 flanges requires understanding of dimensions, pressure classes, materials, and application requirements.<\/p>\n<p><strong>Songhai Flanges<\/strong> supplies ASME B16.5 compliant flanges in all pressure classes, sizes, and materials with full certification and competitive pricing.<br \/>\n<strong>WhatsApp:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>Email:<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1480\" src=\"http:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1.webp\" alt=\"\" width=\"1290\" height=\"2317\" srcset=\"https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1.webp 1290w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-167x300.webp 167w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-570x1024.webp 570w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-768x1379.webp 768w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-855x1536.webp 855w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-1140x2048.webp 1140w, https:\/\/www.songhaiflanges.com\/wp-content\/uploads\/2026\/04\/4-1-7x12.webp 7w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Complete ASME B16.5 flange dimension tables and selection guide. Find pressure class specifications, bolt patterns, and material requirements for industrial piping.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[1],"tags":[122,186,182,155,121,188,156,158,187,183],"class_list":["post-1587","post","type-post","status-publish","format-standard","hentry","category-3-news","tag-asme-b16-5","tag-bolt-circle-diameter","tag-carbon-steel-flanges","tag-flange-dimensions","tag-flange-size-chart","tag-flange-specifications","tag-pipe-flanges","tag-pressure-class","tag-raised-face-flanges","tag-stainless-steel-flanges"],"_links":{"self":[{"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/posts\/1587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/comments?post=1587"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/posts\/1587\/revisions"}],"predecessor-version":[{"id":1598,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/posts\/1587\/revisions\/1598"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/media?parent=1587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/categories?post=1587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/ms\/wp-json\/wp\/v2\/tags?post=1587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}