{"id":16135,"date":"2025-12-19T11:54:15","date_gmt":"2025-12-19T17:54:15","guid":{"rendered":"https:\/\/blog.misumiusa.com\/?page_id=16135"},"modified":"2025-12-19T12:18:43","modified_gmt":"2025-12-19T18:18:43","slug":"thread-pitch-chart","status":"publish","type":"page","link":"https:\/\/us.misumi-ec.com\/blog\/thread-pitch-chart\/","title":{"rendered":"Thread Pitch Chart"},"content":{"rendered":"\n

This thread chart covers UNC, UNF, and 8UN sizes, pairing threads per inch with key dimensions such as thread pitch diameter. Used during design, inspection, or maintenance, a well-organized UNC UNF thread chart serves as a practical reference for selecting and verifying Unified thread sizes.<\/p>\n\n\n\n

\"Thread<\/figure>\n\n\n\n\n\n\n \n \n Thread Pitch Chart<\/title>\n <style>\n .thread-chart-container {\n font-family: Arial, sans-serif;\n padding: 20px;\n max-width: 100%;\n box-sizing: border-box;\n }\n \n .thread-chart-container * {\n box-sizing: border-box;\n }\n \n .thread-chart-title {\n color: #000;\n font-size: 24px;\n font-weight: bold;\n margin-bottom: 20px;\n text-align: center;\n }\n \n .thread-chart-table {\n width: 100%;\n border-collapse: collapse;\n background: #fff;\n box-shadow: 0 2px 8px rgba(0,0,0,0.1);\n }\n \n .thread-chart-table thead {\n background: #000;\n color: #FFD700;\n }\n \n .thread-chart-table th {\n padding: 12px 8px;\n text-align: left;\n font-weight: bold;\n border: 1px solid #333;\n font-size: 13px;\n }\n \n .thread-chart-table tbody tr {\n background: #fff;\n transition: all 0.3s ease;\n }\n \n .thread-chart-table tbody tr:nth-child(even) {\n background: #f8f8f8;\n }\n \n .thread-chart-table tbody tr:hover {\n background: #0066CC;\n color: #fff;\n transform: scale(1.02);\n box-shadow: 0 4px 12px rgba(0,102,204,0.3);\n }\n \n .thread-chart-table td {\n padding: 10px 8px;\n border: 1px solid #ddd;\n font-size: 13px;\n }\n \n .thread-chart-table tbody tr:hover td {\n border-color: #0066CC;\n }\n \n .size-col {\n font-weight: bold;\n color: #000;\n }\n \n .thread-chart-table tbody tr:hover .size-col {\n color: #FFD700;\n }\n \n .thread-type-header {\n background: #FFD700 !important;\n color: #000 !important;\n font-weight: bold;\n text-align: center;\n }\n \n @media (max-width: 768px) {\n .thread-chart-container {\n padding: 10px;\n overflow-x: auto;\n }\n \n .thread-chart-table {\n font-size: 11px;\n }\n \n .thread-chart-table th,\n .thread-chart-table td {\n padding: 6px 4px;\n }\n }\n <\/style>\n\n\n <div class=\"thread-chart-container\">\n <div class=\"thread-chart-title\">Thread Pitch Chart – UNC, UNF, 8UN Series<\/div>\n <table class=\"thread-chart-table\">\n <thead>\n <tr>\n <th rowspan=\"2\">Nominal Size<\/th>\n <th colspan=\"4\" class=\"thread-type-header\">UNC – Coarse Thread<\/th>\n <th colspan=\"4\" class=\"thread-type-header\">UNF – Fine Thread<\/th>\n <th colspan=\"4\" class=\"thread-type-header\">8UN – 8 Thread<\/th>\n <\/tr>\n <tr>\n <th>TPI<\/th>\n <th>Pitch Dia (in)<\/th>\n <th>Section ID (sq in)<\/th>\n <th>Tensile Area (sq in)<\/th>\n <th>TPI<\/th>\n <th>Pitch Dia (in)<\/th>\n <th>Section ID (sq in)<\/th>\n <th>Tensile Area (sq in)<\/th>\n <th>TPI<\/th>\n <th>Pitch Dia (in)<\/th>\n <th>Section ID (sq in)<\/th>\n <th>Tensile Area (sq in)<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td class=\"size-col\">#1 (0.073)<\/td>\n <td>64<\/td><td>0.0629<\/td><td>0.00218<\/td><td>0.00263<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#2 (0.086)<\/td>\n <td>56<\/td><td>0.0744<\/td><td>0.00310<\/td><td>0.00370<\/td>\n <td>64<\/td><td>0.0759<\/td><td>0.00339<\/td><td>0.00394<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#3 (0.099)<\/td>\n <td>48<\/td><td>0.0855<\/td><td>0.00438<\/td><td>0.00487<\/td>\n <td>56<\/td><td>0.0874<\/td><td>0.00451<\/td><td>0.00523<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#4 (0.112)<\/td>\n <td>40<\/td><td>0.0958<\/td><td>0.00604<\/td><td>0.00661<\/td>\n <td>48<\/td><td>0.0985<\/td><td>0.00566<\/td><td>0.00661<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#5 (0.125)<\/td>\n <td>40<\/td><td>0.1088<\/td><td>0.00796<\/td><td>0.00830<\/td>\n <td>44<\/td><td>0.1102<\/td><td>0.00730<\/td><td>0.00830<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#6 (0.138)<\/td>\n <td>32<\/td><td>0.1177<\/td><td>0.00909<\/td><td>0.01015<\/td>\n <td>40<\/td><td>0.1218<\/td><td>0.00909<\/td><td>0.01050<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#8 (0.164)<\/td>\n <td>32<\/td><td>0.1437<\/td><td>0.0140<\/td><td>0.0147<\/td>\n <td>36<\/td><td>0.1460<\/td><td>0.0147<\/td><td>0.0147<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#10 (0.190)<\/td>\n <td>24<\/td><td>0.1629<\/td><td>0.0175<\/td><td>0.0200<\/td>\n <td>32<\/td><td>0.1697<\/td><td>0.0200<\/td><td>0.0200<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">#12 (0.216)<\/td>\n <td>24<\/td><td>0.1889<\/td><td>0.0242<\/td><td>0.0258<\/td>\n <td>28<\/td><td>0.1928<\/td><td>0.0258<\/td><td>0.0258<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1\/4<\/td>\n <td>20<\/td><td>0.2175<\/td><td>0.0318<\/td><td>0.0364<\/td>\n <td>28<\/td><td>0.2268<\/td><td>0.0364<\/td><td>0.0364<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">5\/16<\/td>\n <td>18<\/td><td>0.2764<\/td><td>0.0524<\/td><td>0.0625<\/td>\n <td>24<\/td><td>0.2854<\/td><td>0.0580<\/td><td>0.0625<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3\/8<\/td>\n <td>16<\/td><td>0.3344<\/td><td>0.0775<\/td><td>0.0878<\/td>\n <td>24<\/td><td>0.3479<\/td><td>0.0878<\/td><td>0.0878<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">7\/16<\/td>\n <td>14<\/td><td>0.3911<\/td><td>0.1063<\/td><td>0.1187<\/td>\n <td>20<\/td><td>0.4050<\/td><td>0.1187<\/td><td>0.1187<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1\/2<\/td>\n <td>13<\/td><td>0.4500<\/td><td>0.1419<\/td><td>0.1599<\/td>\n <td>20<\/td><td>0.4675<\/td><td>0.1599<\/td><td>0.1599<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">9\/16<\/td>\n <td>12<\/td><td>0.5084<\/td><td>0.182<\/td><td>0.203<\/td>\n <td>18<\/td><td>0.5264<\/td><td>0.203<\/td><td>0.203<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">5\/8<\/td>\n <td>11<\/td><td>0.5660<\/td><td>0.226<\/td><td>0.256<\/td>\n <td>18<\/td><td>0.5889<\/td><td>0.256<\/td><td>0.256<\/td>\n <td>8<\/td><td>0.5750<\/td><td>0.236<\/td><td>0.270<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3\/4<\/td>\n <td>10<\/td><td>0.6850<\/td><td>0.334<\/td><td>0.373<\/td>\n <td>16<\/td><td>0.7094<\/td><td>0.373<\/td><td>0.373<\/td>\n <td>8<\/td><td>0.7000<\/td><td>0.351<\/td><td>0.398<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">7\/8<\/td>\n <td>9<\/td><td>0.8028<\/td><td>0.462<\/td><td>0.509<\/td>\n <td>14<\/td><td>0.8286<\/td><td>0.509<\/td><td>0.509<\/td>\n <td>8<\/td><td>0.8250<\/td><td>0.489<\/td><td>0.551<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1<\/td>\n <td>8<\/td><td>0.9188<\/td><td>0.606<\/td><td>0.663<\/td>\n <td>12<\/td><td>0.9459<\/td><td>0.663<\/td><td>0.663<\/td>\n <td>8<\/td><td>0.9500<\/td><td>0.652<\/td><td>0.728<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1 1\/8<\/td>\n <td>7<\/td><td>1.0322<\/td><td>0.763<\/td><td>0.856<\/td>\n <td>12<\/td><td>1.0709<\/td><td>0.856<\/td><td>0.856<\/td>\n <td>8<\/td><td>1.0750<\/td><td>0.840<\/td><td>0.929<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1 1\/4<\/td>\n <td>7<\/td><td>1.1572<\/td><td>0.969<\/td><td>1.073<\/td>\n <td>12<\/td><td>1.1959<\/td><td>1.073<\/td><td>1.073<\/td>\n <td>8<\/td><td>1.2000<\/td><td>1.054<\/td><td>1.155<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1 3\/8<\/td>\n <td>6<\/td><td>1.2667<\/td><td>1.16<\/td><td>1.32<\/td>\n <td>12<\/td><td>1.3209<\/td><td>1.32<\/td><td>1.32<\/td>\n <td>8<\/td><td>1.3250<\/td><td>1.29<\/td><td>1.41<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1 1\/2<\/td>\n <td>6<\/td><td>1.3917<\/td><td>1.41<\/td><td>1.58<\/td>\n <td>12<\/td><td>1.4459<\/td><td>1.58<\/td><td>1.58<\/td>\n <td>8<\/td><td>1.4500<\/td><td>1.55<\/td><td>1.68<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">1 3\/4<\/td>\n <td>5<\/td><td>1.6201<\/td><td>1.90<\/td><td>2.20<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>1.7000<\/td><td>2.13<\/td><td>2.30<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">2<\/td>\n <td>4.5<\/td><td>1.8557<\/td><td>2.50<\/td><td>2.89<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>1.9500<\/td><td>2.77<\/td><td>3.02<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">2 1\/4<\/td>\n <td>4.5<\/td><td>2.1057<\/td><td>3.25<\/td><td>3.72<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>2.2000<\/td><td>3.58<\/td><td>3.86<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">2 1\/2<\/td>\n <td>4<\/td><td>2.3376<\/td><td>4.00<\/td><td>4.62<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>2.4500<\/td><td>4.44<\/td><td>4.81<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">2 3\/4<\/td>\n <td>4<\/td><td>2.5876<\/td><td>4.93<\/td><td>5.62<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>2.7000<\/td><td>5.43<\/td><td>5.87<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3<\/td>\n <td>4<\/td><td>2.8376<\/td><td>5.97<\/td><td>6.78<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>2.9500<\/td><td>6.51<\/td><td>7.03<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3 1\/4<\/td>\n <td>4<\/td><td>3.0876<\/td><td>7.10<\/td><td>8.04<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>3.2000<\/td><td>7.70<\/td><td>8.30<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3 1\/2<\/td>\n <td>4<\/td><td>3.3376<\/td><td>8.30<\/td><td>9.40<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>3.4500<\/td><td>8.96<\/td><td>9.66<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">3 3\/4<\/td>\n <td>4<\/td><td>3.5876<\/td><td>9.62<\/td><td>10.88<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>3.7000<\/td><td>10.35<\/td><td>11.15<\/td>\n <\/tr>\n <tr>\n <td class=\"size-col\">4<\/td>\n <td>4<\/td><td>3.8376<\/td><td>11.05<\/td><td>12.47<\/td>\n <td>–<\/td><td>–<\/td><td>–<\/td><td>–<\/td>\n <td>8<\/td><td>3.9500<\/td><td>11.82<\/td><td>12.73<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n\n\n\n\n\n<p><\/p>\n\n\n\n<h2>Parting Thoughts<\/h2>\n\n\n\n<p><a href=\"https:\/\/us.misumi-ec.com\/\">MISUMI USA<\/a> offers a wide range of screws and bolts\u2014both standard and metric\u2014including <a href=\"https:\/\/us.misumi-ec.com\/vona2\/mech_screw\/M3301000000\/M3301090000\/\">hex head bolts<\/a>, narrow head bolts, square head bolts, and more. If you\u2019re unsure which bolt product best suits your application, our engineering team is <a href=\"https:\/\/us.misumi-ec.com\/service\/info\/help-center\/product-support.html\">here to help<\/a>. For more technical insights, explore our other manufacturing-focused tables and articles, such as a <a href=\"https:\/\/us.misumi-ec.com\/blog\/metric-bolt-torque-chart-specs\/\">Metric Bolt Torque Chart<\/a>, and <a href=\"https:\/\/us.misumi-ec.com\/blog\/bolt-grades-chart\/\" title=\"\">Bolt Grades Chart<\/a>.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Author: <a href=\"https:\/\/us.misumi-ec.com\/blog\/author\/sbredemann\/\">Scott Bredemann<\/a> | Updated: 12\/19\/2025<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>Disclaimer:<br><\/strong>The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers\u2019 or manufacturers\u2019 deliverables within MISUMI\u2019s network. Buyers are responsible for specifying their part requirements<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This thread chart covers UNC, UNF, and 8UN sizes, pairing threads per inch with key dimensions such as thread pitch diameter. Used during design, inspection, or maintenance, a well-organized UNC UNF thread chart serves as a practical reference for selecting and verifying Unified thread sizes. Thread Pitch Chart Thread Pitch Chart – UNC, UNF, 8UN Series Nominal Size UNC – […]<\/p>\n","protected":false},"author":70,"featured_media":16142,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/pages\/16135"}],"collection":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/users\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/comments?post=16135"}],"version-history":[{"count":5,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/pages\/16135\/revisions"}],"predecessor-version":[{"id":16144,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/pages\/16135\/revisions\/16144"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/media\/16142"}],"wp:attachment":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/media?parent=16135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}