{"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\/zh\/2026\/04\/12\/flange-bolt-torque-values-complete-reference-chart-for-asme-b16-5\/","title":{"rendered":"ASME B16.5 \u6cd5\u5170\u87ba\u6813\u626d\u77e9\u503c\u5b8c\u6574\u53c2\u8003\u8868"},"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>\u91cd\u590d\u4f7f\u7528\u65e7\u57ab\u5708<\/li>\n<\/ul>\n<p><strong>Contact Songhai Flange<\/strong> for torque specifications and technical documentation.<\/p>\n<p><strong>WhatsApp\uff1a<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u7535\u5b50\u90ae\u4ef6\uff1a<\/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>\u4e3a\u4ec0\u4e48\u6b63\u786e\u7684\u6cd5\u5170\u87ba\u6813\u626d\u77e9\u53ef\u4ee5\u9632\u6b62\u4ee3\u4ef7\u9ad8\u6602\u7684\u6cc4\u6f0f \u4e0d\u6b63\u786e\u7684\u87ba\u6813\u626d\u77e9\u662f\u6cd5\u5170\u63a5\u5934\u6545\u969c\u7684\u4e3b\u8981\u539f\u56e0\u3002\u5e94\u7528\u6b63\u786e\u7684\u626d\u77e9\u53ef\u786e\u4fdd\u57ab\u7247\u7684\u9002\u5f53\u538b\u7f29\uff0c\u5e76\u9632\u6b62\u505c\u673a\u548c\u5b89\u5168\u4e8b\u6545\u7684\u53d1\u751f\u3002\u76ee\u6807\u626d\u77e9\u8ba1\u7b97\u516c\u5f0f ASME PCC-1 \u9644\u5f55 K \u516c\u5f0f\uff1aT = K x D x F \/ N T = \u6bcf [...]\u7684\u76ee\u6807\u626d\u77e9<\/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\/zh\/wp-json\/wp\/v2\/posts\/976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/comments?post=976"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts\/976\/revisions"}],"predecessor-version":[{"id":988,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts\/976\/revisions\/988"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/media?parent=976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/categories?post=976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/tags?post=976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}