{"id":976,"date":"2026-04-12T23:09:01","date_gmt":"2026-04-13T03:09:01","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=976"},"modified":"2026-04-12T23:20:09","modified_gmt":"2026-04-13T03:20:09","slug":"flange-bolt-torque-values-complete-reference-chart-for-asme-b16-5","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/ru\/2026\/04\/12\/flange-bolt-torque-values-complete-reference-chart-for-asme-b16-5\/","title":{"rendered":"Flange Bolt Torque Values Complete Reference Chart for ASME B16.5"},"content":{"rendered":"<h2>Why Proper Flange Bolt Torque Prevents Costly Leaks<\/h2>\n<p>Incorrect bolt torque is a leading cause of flange joint failures. Applying correct torque ensures proper gasket compression and prevents shutdowns and safety incidents.<\/p>\n<h2>Target Torque Calculation Formula<\/h2>\n<p>ASME PCC-1 Appendix K formula: <strong>T = K x D x F \/ N<\/strong><\/p>\n<ul>\n<li>T = Target torque per bolt<\/li>\n<li>K = Nut factor (thread friction)<\/li>\n<li>D = Nominal bolt diameter<\/li>\n<li>F = Total bolt load required<\/li>\n<li>N = Number of bolts<\/li>\n<\/ul>\n<h3>Nut Factor Values<\/h3>\n<ul>\n<li>Unlubricated carbon steel: K = 0.20<\/li>\n<li>Moly-based lubricant: K = 0.13-0.15<\/li>\n<li>PTFE-coated studs: K = 0.10<\/li>\n<\/ul>\n<h2>Reference Torque Values (Lubricated Threads)<\/h2>\n<h3>Class 150 Flanges<\/h3>\n<table border=\"1\" cellpadding=\"8\">\n<tr>\n<th>NPS<\/th>\n<th>Bolt Size<\/th>\n<th>Bolts<\/th>\n<th>Torque (ft-lbs)<\/th>\n<\/tr>\n<tr>\n<td>1\/2<\/td>\n<td>1\/2-13<\/td>\n<td>4<\/td>\n<td>15<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>5\/8-11<\/td>\n<td>4<\/td>\n<td>25<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>3\/4-10<\/td>\n<td>8<\/td>\n<td>45<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>7\/8-9<\/td>\n<td>8<\/td>\n<td>60<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>7\/8-9<\/td>\n<td>12<\/td>\n<td>60<\/td>\n<\/tr>\n<\/table>\n<h3>Class 300 Flanges<\/h3>\n<table border=\"1\" cellpadding=\"8\">\n<tr>\n<th>NPS<\/th>\n<th>Bolt Size<\/th>\n<th>Bolts<\/th>\n<th>Torque (ft-lbs)<\/th>\n<\/tr>\n<tr>\n<td>1\/2<\/td>\n<td>1\/2-13<\/td>\n<td>4<\/td>\n<td>20<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>3\/4-10<\/td>\n<td>4<\/td>\n<td>45<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>7\/8-9<\/td>\n<td>8<\/td>\n<td>90<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>1-8<\/td>\n<td>8<\/td>\n<td>120<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>1-1\/8-8<\/td>\n<td>12<\/td>\n<td>160<\/td>\n<\/tr>\n<\/table>\n<h2>4-Pass Tightening Procedure<\/h2>\n<ol>\n<li>Pass 1: Star pattern at 30% torque<\/li>\n<li>Pass 2: Star pattern at 60% torque<\/li>\n<li>Pass 3: Star pattern at 100% torque<\/li>\n<li>Pass 4: Circular pattern at 100% until no rotation<\/li>\n<\/ol>\n<h2>Common Mistakes<\/h2>\n<ul>\n<li>No lubricant on studs<\/li>\n<li>Skipping multi-pass sequence<\/li>\n<li>Mixing bolt grades<\/li>\n<li>Reusing old gaskets<\/li>\n<\/ul>\n<p><strong>Contact Songhai Flange<\/strong> for torque specifications and technical documentation.<\/p>\n<p><strong>WhatsApp:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u0430\u044f \u043f\u043e\u0447\u0442\u0430:<\/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-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" 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>","protected":false},"excerpt":{"rendered":"<p>Why Proper Flange Bolt Torque Prevents Costly Leaks Incorrect bolt torque is a leading cause of flange joint failures. Applying correct torque ensures proper gasket compression and prevents shutdowns and safety incidents. Target Torque Calculation Formula ASME PCC-1 Appendix K formula: T = K x D x F \/ N T = Target torque per [&hellip;]<\/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-976","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/comments?post=976"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/976\/revisions"}],"predecessor-version":[{"id":988,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/976\/revisions\/988"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/media?parent=976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/categories?post=976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/tags?post=976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}