{"id":20088,"date":"2026-11-03T14:58:54","date_gmt":"2026-11-03T14:58:54","guid":{"rendered":"https:\/\/onmytoolings.com\/machining-calculator\/countersink-depth-calculator\/"},"modified":"2026-11-03T14:58:54","modified_gmt":"2026-11-03T14:58:54","slug":"countersink-depth-calculator","status":"publish","type":"page","link":"https:\/\/onmytoolings.com\/fr\/machining-calculator\/countersink-depth-calculator\/","title":{"rendered":"Countersink Depth Calculator"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"20088\" class=\"elementor elementor-20088 elementor-bc-flex-widget\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-omsec elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"omsec\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container 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.om-cta{background:#eaf3ff;border:1px solid #cfdef2;padding:20px;border-radius:11px;margin:25px 0}\n.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-cta a{display:inline-block;margin:8px 12px 0 0;border-radius:6px;background:#1f65c8;padding:10px 14px;color:#fff!important;text-decoration:none!important;font-weight:700}\n.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-cta a.alt{background:#fff;color:#1e62b5!important;border:1px solid #1e62b5}\n.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-source{font-size:13px;color:#63738a;margin-top:20px}\n.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-source a{color:#2467be;text-decoration:underline}\n@media(max-width:640px){.onmycalc[data-onmy-id=\"countersink-depth-calculator\"]{padding:10px}.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-panel{padding:16px}.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-grid,.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-results{grid-template-columns:minmax(0,1fr)}.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-btn{flex:1 1 145px}.onmycalc[data-onmy-id=\"countersink-depth-calculator\"] .om-result-value{font-size:22px}}\n<\/style>\n<header><div class=\"om-kicker\">ONMY TOOLINGS \u00b7 Drilling Calculator<\/div>\n<h2>Countersink Depth Calculator<\/h2><p class=\"om-intro\">Calculate axial countersink depth from the entry-hole diameter, countersink top diameter and included angle.<\/p><\/header>\n<div class=\"om-panel\"><div class=\"om-toolbar\"><h3>Online Calculator<\/h3><label>Measurement units <select class=\"om-units\" data-om-units=\"\"><option value=\"metric\">Metric<\/option><option value=\"imperial\">Imperial<\/option><\/select><\/label><\/div>\n<div class=\"om-grid\"><label class=\"om-field\"><span>Existing hole diameter <small data-om-unit=\"\">mm<\/small><\/span><input type=\"number\" inputmode=\"decimal\" step=\"any\" value=\"6\" data-key=\"hole\" data-kind=\"len\" data-label=\"Existing hole diameter\" data-example=\"6\" aria-label=\"Existing hole diameter\"><\/label><label class=\"om-field\"><span>Desired countersink diameter <small data-om-unit=\"\">mm<\/small><\/span><input type=\"number\" inputmode=\"decimal\" step=\"any\" value=\"12\" data-key=\"top\" data-kind=\"len\" data-label=\"Desired countersink diameter\" data-example=\"12\" aria-label=\"Desired countersink diameter\"><\/label><label class=\"om-field\"><span>Countersink included angle <small data-om-unit=\"\">\u00b0<\/small><\/span><input type=\"number\" inputmode=\"decimal\" step=\"any\" value=\"90\" data-key=\"angle\" data-kind=\"angle\" data-label=\"Countersink included angle\" data-example=\"90\" aria-label=\"Countersink included angle\"><\/label><\/div>\n<div class=\"om-actions\"><button class=\"om-btn\" type=\"button\" data-om-example=\"\">Load Example<\/button><button class=\"om-btn secondary\" type=\"button\" data-om-clear=\"\">Clear<\/button><\/div>\n<div class=\"om-results\" data-om-results=\"\" role=\"status\" aria-live=\"polite\"><\/div><p class=\"om-status\" data-om-status=\"\" role=\"alert\"><\/p>\n<p class=\"om-notice\">Results use the inputs above; example values are illustrative and are not tool-specific speed\/feed recommendations.<\/p>\n<\/div>\n<div class=\"om-content\"><section><h3>Formulas and Calculation Method<\/h3><p class=\"om-formula\">Depth = (top diameter \u2212 hole diameter) \/ [2 tan(included angle \/ 2)].<\/p><p>An ideal countersink is a conical enlargement above an existing hole. The axial depth follows directly from the difference between the outer and inner diameters and half the included cone angle. Common included angles include 82\u00b0, 90\u00b0 and 100\u00b0 but the value must match the fastener and tool geometry.<\/p><\/section>\n<section><h3>Important Assumptions and Limitations<\/h3><p>Geometric depth only. Does not include tool tip truncation, chamfer edges, runout, fastener seating tolerances or actual tool offset. Verify diameter and seating with the drawing.<\/p><\/section>\n<section><h3>Frequently Asked Questions<\/h3><details><summary>Does a 90\u00b0 countersink need the same depth as an 82\u00b0 one?<\/summary><p>No. Cone angle changes the axial depth for the same diameter difference.<\/p><\/details><details><summary>Should I program this directly as Z depth?<\/summary><p>Not without accounting for tool geometry, work offset and how the tool is measured.<\/p><\/details><\/section><\/div>\n<div class=\"om-cta\"><h3>Need the Right Cutting Tool?<\/h3><p>Match this calculation to your workpiece material, machine setup and required tooling dimensions. Explore ONMY tools or share your application for a quotation.<\/p>\n<a href=\"https:\/\/onmytoolings.com\/holemaking-tools\/\" target=\"_blank\">Explore Holemaking Tools<\/a><a class=\"alt\" href=\"https:\/\/onmytoolings.com\/contact\/\" target=\"_blank\">Request a Quote<\/a><\/div>\n<p class=\"om-source\"><strong>Technical references:<\/strong> <a href=\"https:\/\/www.machiningdoctor.com\/calculators\/\" target=\"_blank\" rel=\"noopener noreferrer\">Machining Doctor \u2014 Online Machining Calculators<\/a>. Calculations are independently implemented for ONMY; source links do not imply endorsement.<\/p>\n<script>\n(function(){\n'use strict';\nconst self=document.currentScript;\nconst root=(self&&self.closest('[data-onmy-id=\"countersink-depth-calculator\"]'))||Array.from(document.querySelectorAll('[data-onmy-id=\"countersink-depth-calculator\"]')).find(e=>!e.__omReady);\nif(!root||root.__omReady)return;\nroot.__omReady=true;try{root.removeAttribute('data-om-ready');}catch(e){}\nconst $=(s)=>root.querySelector(s);\nconst unitSelect=$('[data-om-units]');\nconst results=$('[data-om-results]');\nconst status=$('[data-om-status]');\nconst fields=Array.from(root.querySelectorAll('[data-key]'));\nconst FACTORS={\"len\": [\"mm\", \"in\", 25.4], \"mmfix\": [\"mm\", \"mm\", 1], \"infix\": [\"in\", \"in\", 25.4], \"speed\": [\"m\/min\", \"SFM\", 0.3048], \"fz\": [\"mm\/rev or tooth\", \"in\/rev or tooth\", 25.4], \"f_rev\": [\"mm\/rev\", \"in\/rev\", 25.4], \"f_tooth\": [\"mm\/tooth\", \"in\/tooth\", 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setLabels(){fields.forEach(e=>{const wrapper=e.closest('.om-field');const when=wrapper.dataset.forUnit;const mode=($('[data-key=\\\"mode\\\"]')||{}).value;const modes=wrapper.dataset.forMode;wrapper.hidden=Boolean((when&&when!==unit)||(modes&&!modes.split(',').includes(mode)));\nconst span=wrapper.querySelector('[data-om-unit]');if(span)span.textContent=valueLabel(e.dataset.kind);});}\nunitSelect.addEventListener('change',()=>{const next=unitSelect.value,old=unit;fields.forEach(e=>{if(e.tagName==='SELECT'||e.value.trim()===''||e.closest('.om-field').dataset.forUnit)return;\nconst fc=(FACTORS[e.dataset.kind]||['','',1])[2];if(fc===1)return;const x=Number(e.value);if(Number.isFinite(x)){const metric=old==='imperial'?x*fc:x;e.value=Number(next==='imperial'?(metric\/fc).toPrecision(10):metric.toPrecision(10));}});\nunit=next;setLabels();calculate();});\nfields.forEach(e=>{const fn=()=>{if(e.dataset.key==='mode')setLabels();calculate();};e.addEventListener('input',fn);e.addEventListener('change',fn);});\n$('[data-om-example]').addEventListener('click',()=>{fields.forEach(e=>{let raw=e.dataset.example;if(e.tagName==='SELECT'){e.value=raw;return;}let fc=(FACTORS[e.dataset.kind]||['','',1])[2];if(e.closest('.om-field').dataset.forUnit)fc=1;let v=Number(raw);e.value=unit==='imperial'&&fc!==1?Number((v\/fc).toPrecision(10)):raw;});calculate();});\n$('[data-om-clear]').addEventListener('click',()=>{fields.forEach(e=>{if(e.tagName!=='SELECT')e.value='';});results.replaceChildren();status.textContent='Enter the parameters to see calculation results.';});\nsetLabels();calculate();\n})();\n<\/script>\n<\/section>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>ONMY TOOLINGS \u00b7 Drilling Calculator Countersink Depth Calculator Calculate axial countersink depth from the entry-hole diameter, countersink top diameter and included angle. Online Calculator Measurement units MetricImperial Existing hole diameter mmDesired countersink diameter mmCountersink included angle \u00b0 Load ExampleClear Results use the inputs above; example values are illustrative and are not tool-specific speed\/feed recommendations. Formulas [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":15030,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-20088","page","type-page","status-publish","hentry"],"acf":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"jiang","author_link":"https:\/\/onmytoolings.com\/fr\/author\/jiang\/"},"uagb_comment_info":0,"uagb_excerpt":"ONMY TOOLINGS \u00b7 Drilling Calculator Countersink Depth Calculator Calculate axial countersink depth from the entry-hole diameter, countersink top diameter and included angle. Online Calculator Measurement units MetricImperial Existing hole diameter mmDesired countersink diameter mmCountersink included angle \u00b0 Load ExampleClear Results use the inputs above; example values are illustrative and are not tool-specific speed\/feed recommendations. 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