{"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\/it\/2026\/04\/12\/flange-bolt-torque-values-complete-reference-chart-for-asme-b16-5\/","title":{"rendered":"Valori di coppia dei bulloni delle flange Tabella di riferimento completa per 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>E-mail:<\/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>Perch\u00e9 una corretta coppia di serraggio dei bulloni della flangia previene perdite costose Una coppia di serraggio errata \u00e8 la causa principale dei guasti ai giunti flangiati. L'applicazione di una coppia corretta assicura una corretta compressione della guarnizione e previene arresti e incidenti di sicurezza. Formula di calcolo della coppia target Formula ASME PCC-1 Appendice K: T = K x D x F \/ N T = Coppia target per [...]<\/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\/it\/wp-json\/wp\/v2\/posts\/976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/comments?post=976"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/976\/revisions"}],"predecessor-version":[{"id":988,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/976\/revisions\/988"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/media?parent=976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/categories?post=976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/tags?post=976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}