{"id":16948,"date":"2026-05-21T10:13:35","date_gmt":"2026-05-21T15:13:35","guid":{"rendered":"https:\/\/blog.misumiusa.com\/?p=16948"},"modified":"2026-06-05T12:54:56","modified_gmt":"2026-06-05T17:54:56","slug":"button-head-socket-cap-size-chart","status":"publish","type":"post","link":"https:\/\/us.misumi-ec.com\/blog\/button-head-socket-cap-size-chart\/","title":{"rendered":"Button Head Socket Cap Size Chart"},"content":{"rendered":"\n<p>Because button head screw dimensions vary by screw size, thread type, and standard, checking the head diameter, head height, socket size, and thread pitch is important before selecting a fastener. This guide provides button head screw size charts for metric and imperial sizes to help with that.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/blog.misumiusa.com\/wp-content\/uploads\/2026\/05\/Button-head-screw-technical-drawing122.jpg\" alt=\"\" class=\"wp-image-16964\" width=\"737\" height=\"233\"\/><\/figure>\n\n\n\n<h3>Inch Button Head Socket Cap Chart<\/h3>\n\n\n\n<div class=\"misumi-button-head-inch-size-chart\">\n  <style>\n    .misumi-button-head-inch-size-chart {\n      --misumi-blue: #005BAC;\n      --misumi-yellow: #FFD100;\n      --misumi-black: #111111;\n      --misumi-white: #FFFFFF;\n      width: 100%;\n      margin: 24px 0;\n      font-family: Arial, Helvetica, sans-serif;\n    }\n\n    .misumi-button-head-inch-size-chart .table-wrap {\n      width: 100%;\n      overflow-x: visible;\n      border: 1px solid var(--misumi-blue);\n      border-radius: 6px;\n    }\n\n    .misumi-button-head-inch-size-chart table {\n      width: 100%;\n      border-collapse: collapse;\n      table-layout: fixed;\n      background: var(--misumi-white);\n    }\n\n    .misumi-button-head-inch-size-chart th,\n    .misumi-button-head-inch-size-chart td {\n      padding: 9px 8px;\n      text-align: left;\n      border-bottom: 1px solid #d9e2ef;\n      font-size: 13px;\n      line-height: 1.35;\n      color: var(--misumi-black);\n      overflow-wrap: break-word;\n      word-break: normal;\n    }\n\n    .misumi-button-head-inch-size-chart thead th {\n      background: var(--misumi-blue);\n      color: var(--misumi-white);\n      font-weight: 700;\n      border-bottom: 3px solid var(--misumi-yellow);\n      white-space: normal;\n      vertical-align: bottom;\n    }\n\n    .misumi-button-head-inch-size-chart thead th .dim-letter {\n      display: inline-block;\n      margin-left: 3px;\n      color: var(--misumi-yellow);\n      font-weight: 800;\n    }\n\n    .misumi-button-head-inch-size-chart tbody tr:nth-child(even) {\n      background: #f7f9fc;\n    }\n\n    .misumi-button-head-inch-size-chart tbody tr:hover {\n      background: #fff7cc;\n      transition: background 0.2s ease-in-out;\n    }\n\n    .misumi-button-head-inch-size-chart td:first-child {\n      font-weight: 700;\n      color: var(--misumi-blue);\n    }\n\n    .misumi-button-head-inch-size-chart .note {\n      margin-top: 8px;\n      font-size: 13px;\n      line-height: 1.5;\n      color: #444444;\n    }\n\n    @media screen and (max-width: 768px) {\n      .misumi-button-head-inch-size-chart th,\n      .misumi-button-head-inch-size-chart td {\n        padding: 8px 6px;\n        font-size: 12px;\n      }\n\n      .misumi-button-head-inch-size-chart .note {\n        font-size: 12px;\n      }\n    }\n  <\/style>\n\n  <div class=\"table-wrap\">\n    <table>\n      <thead>\n        <tr>\n          <th>Nominal Screw Size<\/th>\n          <th>Basic Screw Diameter <span class=\"dim-letter\">(d)<\/span><\/th>\n          <th>Head Diameter Max. <span class=\"dim-letter\">(A)<\/span><\/th>\n          <th>Head Diameter Min. <span class=\"dim-letter\">(A)<\/span><\/th>\n          <th>Head Height Max. <span class=\"dim-letter\">(C)<\/span><\/th>\n          <th>Head Height Min. <span class=\"dim-letter\">(C)<\/span><\/th>\n          <th>Hex Socket Size <span class=\"dim-letter\">(B)<\/span><\/th>\n          <th>Key Engagement Min. <span class=\"dim-letter\">(E)<\/span><\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td>#1<\/td>\n          <td>0.0730 in.<\/td>\n          <td>0.139 in.<\/td>\n          <td>0.129 in.<\/td>\n          <td>0.039 in.<\/td>\n          <td>0.031 in.<\/td>\n          <td>0.050 in.<\/td>\n          <td>0.028 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#2<\/td>\n          <td>0.0860 in.<\/td>\n          <td>0.164 in.<\/td>\n          <td>0.154 in.<\/td>\n          <td>0.046 in.<\/td>\n          <td>0.038 in.<\/td>\n          <td>0.050 in.<\/td>\n          <td>0.028 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#3<\/td>\n          <td>0.0990 in.<\/td>\n          <td>0.188 in.<\/td>\n          <td>0.176 in.<\/td>\n          <td>0.052 in.<\/td>\n          <td>0.044 in.<\/td>\n          <td>1\/16 in.<\/td>\n          <td>0.035 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#4<\/td>\n          <td>0.1120 in.<\/td>\n          <td>0.213 in.<\/td>\n          <td>0.201 in.<\/td>\n          <td>0.059 in.<\/td>\n          <td>0.051 in.<\/td>\n          <td>1\/16 in.<\/td>\n          <td>0.035 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#5<\/td>\n          <td>0.1250 in.<\/td>\n          <td>0.238 in.<\/td>\n          <td>0.226 in.<\/td>\n          <td>0.066 in.<\/td>\n          <td>0.058 in.<\/td>\n          <td>5\/64 in.<\/td>\n          <td>0.044 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#6<\/td>\n          <td>0.1380 in.<\/td>\n          <td>0.262 in.<\/td>\n          <td>0.250 in.<\/td>\n          <td>0.073 in.<\/td>\n          <td>0.063 in.<\/td>\n          <td>5\/64 in.<\/td>\n          <td>0.044 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#8<\/td>\n          <td>0.1640 in.<\/td>\n          <td>0.312 in.<\/td>\n          <td>0.298 in.<\/td>\n          <td>0.087 in.<\/td>\n          <td>0.077 in.<\/td>\n          <td>3\/32 in.<\/td>\n          <td>0.052 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>#10<\/td>\n          <td>0.1900 in.<\/td>\n          <td>0.361 in.<\/td>\n          <td>0.347 in.<\/td>\n          <td>0.101 in.<\/td>\n          <td>0.091 in.<\/td>\n          <td>1\/8 in.<\/td>\n          <td>0.070 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>1\/4<\/td>\n          <td>0.2500 in.<\/td>\n          <td>0.437 in.<\/td>\n          <td>0.419 in.<\/td>\n          <td>0.132 in.<\/td>\n          <td>0.122 in.<\/td>\n          <td>5\/32 in.<\/td>\n          <td>0.087 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>5\/16<\/td>\n          <td>0.3125 in.<\/td>\n          <td>0.547 in.<\/td>\n          <td>0.527 in.<\/td>\n          <td>0.166 in.<\/td>\n          <td>0.152 in.<\/td>\n          <td>3\/16 in.<\/td>\n          <td>0.094 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>3\/8<\/td>\n          <td>0.3750 in.<\/td>\n          <td>0.656 in.<\/td>\n          <td>0.636 in.<\/td>\n          <td>0.199 in.<\/td>\n          <td>0.185 in.<\/td>\n          <td>7\/32 in.<\/td>\n          <td>0.122 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>1\/2<\/td>\n          <td>0.5000 in.<\/td>\n          <td>0.875 in.<\/td>\n          <td>0.851 in.<\/td>\n          <td>0.265 in.<\/td>\n          <td>0.245 in.<\/td>\n          <td>5\/16 in.<\/td>\n          <td>0.175 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>5\/8<\/td>\n          <td>0.6250 in.<\/td>\n          <td>1.000 in.<\/td>\n          <td>0.970 in.<\/td>\n          <td>0.331 in.<\/td>\n          <td>0.311 in.<\/td>\n          <td>3\/8 in.<\/td>\n          <td>0.210 in.<\/td>\n        <\/tr>\n        <tr>\n          <td>7\/8<\/td>\n          <td>0.8750 in.<\/td>\n          <td>1.375 in.<\/td>\n          <td>1.339 in.<\/td>\n          <td>0.464 in.<\/td>\n          <td>0.438 in.<\/td>\n          <td>1\/2 in.<\/td>\n          <td>0.280 in.<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p class=\"note\">\n    Note: Dimensions can vary by manufacturer, material, finish, and applicable standard. Confirm exact specifications before final design, machining, or replacement work.\n  <\/p>\n<\/div>\n\n\n\n<h3>Metric Button Head Socket Cap <\/h3>\n\n\n\n<div class=\"misumi-button-head-size-chart\">\n  <style>\n    .misumi-button-head-size-chart {\n      --misumi-blue: #005BAC;\n      --misumi-yellow: #FFD100;\n      --misumi-black: #111111;\n      --misumi-white: #FFFFFF;\n      width: 100%;\n      margin: 24px 0;\n      font-family: Arial, Helvetica, sans-serif;\n    }\n\n    .misumi-button-head-size-chart .table-wrap {\n      width: 100%;\n      overflow-x: visible;\n      border: 1px solid var(--misumi-blue);\n      border-radius: 6px;\n    }\n\n    .misumi-button-head-size-chart table {\n      width: 100%;\n      border-collapse: collapse;\n      table-layout: fixed;\n      background: var(--misumi-white);\n    }\n\n    .misumi-button-head-size-chart th,\n    .misumi-button-head-size-chart td {\n      padding: 9px 8px;\n      text-align: left;\n      border-bottom: 1px solid #d9e2ef;\n      font-size: 13px;\n      line-height: 1.35;\n      color: var(--misumi-black);\n      overflow-wrap: break-word;\n      word-break: normal;\n    }\n\n    .misumi-button-head-size-chart thead th {\n      background: var(--misumi-blue);\n      color: var(--misumi-white);\n      font-weight: 700;\n      border-bottom: 3px solid var(--misumi-yellow);\n      white-space: normal;\n      vertical-align: bottom;\n    }\n\n    .misumi-button-head-size-chart thead th .dim-letter {\n      display: inline-block;\n      margin-left: 3px;\n      color: var(--misumi-yellow);\n      font-weight: 800;\n    }\n\n    .misumi-button-head-size-chart tbody tr:nth-child(even) {\n      background: #f7f9fc;\n    }\n\n    .misumi-button-head-size-chart tbody tr:hover {\n      background: #fff7cc;\n      transition: background 0.2s ease-in-out;\n    }\n\n    .misumi-button-head-size-chart td:first-child {\n      font-weight: 700;\n      color: var(--misumi-blue);\n    }\n\n    @media screen and (max-width: 768px) {\n      .misumi-button-head-size-chart th,\n      .misumi-button-head-size-chart td {\n        padding: 8px 6px;\n        font-size: 12px;\n      }\n    }\n  <\/style>\n\n  <div class=\"table-wrap\">\n    <table>\n      <thead>\n        <tr>\n          <th>Nominal Screw Size<\/th>\n          <th>Thread Pitch <span class=\"dim-letter\">(M\u00d7P)<\/span><\/th>\n          <th>Head Diameter Max. <span class=\"dim-letter\">(A)<\/span><\/th>\n          <th>Head Diameter Min. <span class=\"dim-letter\">(A)<\/span><\/th>\n          <th>Head Height Max. <span class=\"dim-letter\">(C)<\/span><\/th>\n          <th>Head Height Min. <span class=\"dim-letter\">(C)<\/span><\/th>\n          <th>Hex Socket Size <span class=\"dim-letter\">(B)<\/span><\/th>\n          <th>Key Engagement Min. <span class=\"dim-letter\">(E)<\/span><\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td>M2<\/td>\n          <td>0.4 mm<\/td>\n          <td>3.80 mm<\/td>\n          <td>3.50 mm<\/td>\n          <td>1.10 mm<\/td>\n          <td>0.95 mm<\/td>\n          <td>1.3 mm<\/td>\n          <td>0.67 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M3<\/td>\n          <td>0.5 mm<\/td>\n          <td>5.70 mm<\/td>\n          <td>5.40 mm<\/td>\n          <td>1.65 mm<\/td>\n          <td>1.43 mm<\/td>\n          <td>2.0 mm<\/td>\n          <td>1.04 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M4<\/td>\n          <td>0.7 mm<\/td>\n          <td>7.60 mm<\/td>\n          <td>7.24 mm<\/td>\n          <td>2.20 mm<\/td>\n          <td>1.95 mm<\/td>\n          <td>2.5 mm<\/td>\n          <td>1.30 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M5<\/td>\n          <td>0.8 mm<\/td>\n          <td>9.50 mm<\/td>\n          <td>9.14 mm<\/td>\n          <td>2.75 mm<\/td>\n          <td>2.50 mm<\/td>\n          <td>3.0 mm<\/td>\n          <td>1.56 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M6<\/td>\n          <td>1.0 mm<\/td>\n          <td>10.50 mm<\/td>\n          <td>10.07 mm<\/td>\n          <td>3.30 mm<\/td>\n          <td>3.00 mm<\/td>\n          <td>4.0 mm<\/td>\n          <td>2.08 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M8<\/td>\n          <td>1.25 mm<\/td>\n          <td>14.00 mm<\/td>\n          <td>13.57 mm<\/td>\n          <td>4.40 mm<\/td>\n          <td>4.10 mm<\/td>\n          <td>5.0 mm<\/td>\n          <td>2.60 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M10<\/td>\n          <td>1.5 mm<\/td>\n          <td>17.50 mm<\/td>\n          <td>17.07 mm<\/td>\n          <td>5.50 mm<\/td>\n          <td>5.20 mm<\/td>\n          <td>6.0 mm<\/td>\n          <td>3.12 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M12<\/td>\n          <td>1.75 mm<\/td>\n          <td>21.00 mm<\/td>\n          <td>20.48 mm<\/td>\n          <td>6.60 mm<\/td>\n          <td>6.24 mm<\/td>\n          <td>8.0 mm<\/td>\n          <td>4.16 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M16<\/td>\n          <td>2.0 mm<\/td>\n          <td>28.00 mm<\/td>\n          <td>27.48 mm<\/td>\n          <td>8.80 mm<\/td>\n          <td>8.44 mm<\/td>\n          <td>10.0 mm<\/td>\n          <td>5.20 mm<\/td>\n        <\/tr>\n        <tr>\n          <td>M20<\/td>\n          <td>2.5 mm<\/td>\n          <td>35.00 mm<\/td>\n          <td>34.40 mm<\/td>\n          <td>11.00 mm<\/td>\n          <td>10.57 mm<\/td>\n          <td>12.0 mm<\/td>\n          <td>6.24 mm<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<style>\n.button-head-cap-screws-cta {\n    display: inline-flex;\n    align-items: center;\n    padding: 12px 24px;\n    background: linear-gradient(135deg, #FFD700 0%, #FFC107 100%);\n    color: #003366;\n    text-decoration: none;\n    border-radius: 6px;\n    font-weight: 600;\n    font-size: 16px;\n    letter-spacing: 0.5px;\n    transition: all 0.3s ease;\n    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.3);\n    border: 2px solid #0066CC;\n    cursor: pointer;\n    text-transform: uppercase;\n}\n\n.button-head-cap-screws-cta:hover {\n    background: linear-gradient(135deg, #FFC107 0%, #FFB300 100%);\n    border-color: #004499;\n    transform: translateY(-2px);\n    box-shadow: 0 6px 16px rgba(255, 215, 0, 0.4);\n}\n\n.button-head-cap-screws-cta:active {\n    transform: translateY(0);\n    box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);\n}\n\n.cta-icon {\n    margin-right: 8px;\n    font-size: 18px;\n}\n<\/style>\n\n<a href=\"https:\/\/us.misumi-ec.com\/vona2\/mech_screw\/M3301000000\/M3301100000\/\" class=\"button-head-cap-screws-cta\">\n    <span class=\"cta-icon\">\u2699<\/span>\n    Browse Button Head Cap Screws\n<\/a>\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> carries a wide range of fasteners, including screws, bolts, nuts, threaded inserts, and more. If you have any questions about fastening concerns for your next project or fix, please feel free to contact our <a href=\"https:\/\/us.misumi-ec.com\/service\/info\/help-center\/product-support.html\">product experts and engineers<\/a>. For more insights about button head and pan head screws, and other manufacturing-related articles, be sure to check out articles like <a href=\"https:\/\/us.misumi-ec.com\/blog\/industrial-fastener-selection-guide\/\">Industrial Fasteners Selection Guide<\/a>, <a href=\"https:\/\/us.misumi-ec.com\/blog\/button-head-screw-vs-pan-head-screw\/\" title=\"\">Button Head Screw vs. Pan Head Screw<\/a>, and more.<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>Disclaimer<\/strong>:<br>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>Find common button head screw sizes for you next job or build with our chart covering screw diameter, head dimensions, and more.<\/p>\n","protected":false},"author":70,"featured_media":16949,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false},"categories":[1136],"tags":[8,625,52],"aioseo_notices":[],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/posts\/16948"}],"collection":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"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=16948"}],"version-history":[{"count":5,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/posts\/16948\/revisions"}],"predecessor-version":[{"id":17043,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/posts\/16948\/revisions\/17043"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/media\/16949"}],"wp:attachment":[{"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/media?parent=16948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/categories?post=16948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/us.misumi-ec.com\/blog\/wp-json\/wp\/v2\/tags?post=16948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}