{"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\/vi\/2026\/04\/12\/flange-bolt-torque-values-complete-reference-chart-for-asme-b16-5\/","title":{"rendered":"B\u1ea3ng tham kh\u1ea3o \u0111\u1ea7y \u0111\u1ee7 c\u00e1c gi\u00e1 tr\u1ecb m\u00f4-men xo\u1eafn bu-l\u00f4ng m\u1eb7t b\u00edch theo ti\u00eau chu\u1ea9n 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>Ch\u1ec9 s\u1ed1 h\u00e0i l\u00f2ng c\u1ee7a kh\u00e1ch h\u00e0ng (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>Ch\u1ec9 s\u1ed1 h\u00e0i l\u00f2ng c\u1ee7a kh\u00e1ch h\u00e0ng (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>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-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>T\u1ea1i sao vi\u1ec7c si\u1ebft bu-l\u00f4ng m\u1eb7t b\u00edch \u0111\u00fang m\u00f4-men xo\u1eafn l\u1ea1i gi\u00fap ng\u0103n ng\u1eeba c\u00e1c s\u1ef1 c\u1ed1 r\u00f2 r\u1ec9 g\u00e2y t\u1ed1n k\u00e9m? M\u00f4-men xo\u1eafn bu-l\u00f4ng kh\u00f4ng \u0111\u00fang l\u00e0 nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u d\u1eabn \u0111\u1ebfn h\u1ecfng h\u00f3c \u1edf m\u1ed1i n\u1ed1i m\u1eb7t b\u00edch. Vi\u1ec7c si\u1ebft bu-l\u00f4ng \u0111\u00fang m\u00f4-men xo\u1eafn \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 n\u00e9n th\u00edch h\u1ee3p c\u1ee7a mi\u1ebfng \u0111\u1ec7m v\u00e0 ng\u0103n ng\u1eeba c\u00e1c s\u1ef1 c\u1ed1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng c\u0169ng nh\u01b0 c\u00e1c s\u1ef1 c\u1ed1 an to\u00e0n. C\u00f4ng th\u1ee9c t\u00ednh m\u00f4-men xo\u1eafn m\u1ee5c ti\u00eau C\u00f4ng th\u1ee9c trong Ph\u1ee5 l\u1ee5c K c\u1ee7a ti\u00eau chu\u1ea9n ASME PCC-1: T = K \u00d7 D \u00d7 F \/ N T = M\u00f4-men xo\u1eafn m\u1ee5c ti\u00eau tr\u00ean [\u2026]<\/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\/vi\/wp-json\/wp\/v2\/posts\/976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/comments?post=976"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts\/976\/revisions"}],"predecessor-version":[{"id":988,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts\/976\/revisions\/988"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/media?parent=976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/categories?post=976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/tags?post=976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}