{"id":100307,"date":"2026-02-15T20:45:15","date_gmt":"2026-02-15T20:45:15","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100307"},"modified":"2026-02-15T20:45:15","modified_gmt":"2026-02-15T20:45:15","slug":"washer-selection","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/washer-selection\/","title":{"rendered":"\u0993\u09af\u09bc\u09be\u09b6\u09be\u09b0 \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8 \u2014 ISO 7089\/7090 \u09b2\u09c1\u0995\u0986\u09aa | \u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Washer Selection ISO 7089\/7090\",\"description\":\"Free online washer dimension lookup per ISO 7089\/7090.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/washer-selection\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2025-01-01\",\"dateModified\":\"2026-02-15\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What is the difference between ISO 7089 and ISO 7090?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO 7089 is a plain (flat) washer, normal series, 200 HV hardness. ISO 7090 is the same dimensions but with a chamfer on one side (beveled edge), also 200 HV. ISO 7090 prevents the washer from digging into soft surfaces.\"}},\n{\"@type\":\"Question\",\"name\":\"What size washer do I need for an M10 bolt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For an M10 bolt per ISO 7089: inner diameter 10.5 mm, outer diameter 20 mm, thickness 2.0 mm.\"}},\n{\"@type\":\"Question\",\"name\":\"When should I use spring washers?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Spring washers (split lock washers, DIN 127 \/ ISO 7091) were historically used to prevent loosening. Modern practice prefers Nord-Lock washers, Belleville washers, or chemical threadlockers. Spring washers are now considered less effective than these alternatives.\"}},\n{\"@type\":\"Question\",\"name\":\"What hardness should flat washers have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO 7089\/7090 specifies 200 HV minimum hardness for standard flat washers. For high-strength bolting (class 10.9\/12.9), use washers per ISO 7089 with 300 HV hardness to prevent embedding.\"}},\n{\"@type\":\"Question\",\"name\":\"Do I always need a washer under a bolt head?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Washers are recommended when: (1) the hole is oversized, (2) the surface is soft or painted, (3) high-strength bolts are used (prevents embedding), (4) the surface is uneven, or (5) the bolt passes through a slotted hole.\"}}\n]}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Washer Selection\",\"item\":\"https:\/\/vibromera.eu\/calculators\/washer-selection\/\"}]}<\/script>\n\n<link 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16px;font-family:var(--vc-font);font-size:13px;font-weight:600;background:var(--vc-surface-alt);color:var(--vc-ink-secondary);border:1px solid var(--vc-border);border-radius:var(--vc-radius);text-decoration:none;transition:all .15s}.vc-related-link:hover{border-color:var(--vc-accent);color:var(--vc-accent);background:var(--vc-accent-light)}\n.vc-promo{margin-top:24px;padding:20px;background:linear-gradient(135deg,var(--vc-accent-light),var(--vc-surface));border:1px solid var(--vc-border);border-radius:var(--vc-radius-lg);display:flex;align-items:center;gap:16px}.vc-promo-text{flex:1;font-size:14px;color:var(--vc-ink-secondary)}.vc-promo-text strong{color:var(--vc-ink)}.vc-promo-link{padding:8px 20px;font-size:13px;font-weight:700;color:#fff;background:var(--vc-accent);border-radius:var(--vc-radius);text-decoration:none;white-space:nowrap;transition:background .15s}.vc-promo-link:hover{background:var(--vc-accent-hover)}\n.vc-footer{text-align:center;padding:32px 16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer a:hover{text-decoration:underline}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}\n@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-washer\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Washer Selection \u2014 ISO 7089 \/ 7090<\/h1>\n    <p class=\"vc-header-subtitle\">Look up flat and spring washer dimensions per ISO 7089\/7090 and DIN 127. Select bolt size to view washer ID, OD, and thickness.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">ISO 7089<\/span><span class=\"vc-badge\">ISO 7090<\/span><span class=\"vc-badge\">DIN 127<\/span><\/div>\n<\/header>\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-size\">Bolt Size<\/label>\n                <select class=\"vc-select\" id=\"vc-size\">\n                    <option value=\"M4\" data-id=\"4.3\" data-od=\"9\" data-t=\"0.8\" data-sid=\"4.1\" data-sod=\"7.6\" data-st=\"0.9\">M4<\/option>\n                    <option value=\"M5\" data-id=\"5.3\" data-od=\"10\" data-t=\"1.0\" data-sid=\"5.1\" data-sod=\"9.2\" data-st=\"1.2\">M5<\/option>\n                    <option value=\"M6\" data-id=\"6.4\" data-od=\"12\" data-t=\"1.6\" data-sid=\"6.1\" data-sod=\"11.8\" data-st=\"1.6\">M6<\/option>\n                    <option value=\"M8\" data-id=\"8.4\" data-od=\"16\" data-t=\"1.6\" data-sid=\"8.2\" data-sod=\"14.8\" data-st=\"2.0\" selected>M8<\/option>\n                    <option value=\"M10\" data-id=\"10.5\" data-od=\"20\" data-t=\"2.0\" data-sid=\"10.2\" data-sod=\"18.1\" data-st=\"2.5\">M10<\/option>\n                    <option value=\"M12\" data-id=\"13.0\" data-od=\"24\" data-t=\"2.5\" data-sid=\"12.2\" data-sod=\"21.1\" data-st=\"3.0\">M12<\/option>\n                    <option value=\"M14\" data-id=\"15.0\" data-od=\"28\" data-t=\"2.5\" data-sid=\"14.2\" data-sod=\"24.1\" data-st=\"3.0\">M14<\/option>\n                    <option value=\"M16\" data-id=\"17.0\" data-od=\"30\" data-t=\"3.0\" data-sid=\"16.2\" data-sod=\"27.4\" data-st=\"3.5\">M16<\/option>\n                    <option value=\"M20\" data-id=\"21.0\" data-od=\"37\" data-t=\"3.0\" data-sid=\"20.2\" data-sod=\"33.6\" data-st=\"4.0\">M20<\/option>\n                    <option value=\"M24\" data-id=\"25.0\" data-od=\"44\" data-t=\"4.0\" data-sid=\"24.5\" data-sod=\"40.0\" data-st=\"5.0\">M24<\/option>\n                    <option value=\"M30\" data-id=\"31.0\" data-od=\"56\" data-t=\"4.0\" data-sid=\"30.5\" data-sod=\"48.2\" data-st=\"6.0\">M30<\/option>\n                    <option value=\"M36\" data-id=\"37.0\" data-od=\"66\" data-t=\"5.0\" data-sid=\"36.5\" data-sod=\"56.2\" data-st=\"6.0\">M36<\/option>\n                <\/select>\n            <\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M6\">M6<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M8\">M8<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M10\">M10<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M12\">M12<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M16\">M16<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M20\">M20<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Flat Washer \u2014 ISO 7089<\/div><div class=\"vc-rcard-value\" id=\"vc-r-flat\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Flat Washer ID<\/div><div class=\"vc-rcard-value\" id=\"vc-r-fid\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Flat Washer OD<\/div><div class=\"vc-rcard-value\" id=\"vc-r-fod\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Flat Washer Thickness<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ft\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Spring Washer (DIN 127)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-spring\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Reference Tables<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Flat Washers \u2014 ISO 7089 (Normal Series)<\/h3>\n        <table class=\"vc-table\"><thead><tr><th>Bolt<\/th><th>ID (mm)<\/th><th>OD (mm)<\/th><th>t (mm)<\/th><\/tr><\/thead><tbody>\n            <tr><td>M6<\/td><td>6.4<\/td><td>12<\/td><td>1.6<\/td><\/tr>\n            <tr><td>M8<\/td><td>8.4<\/td><td>16<\/td><td>1.6<\/td><\/tr>\n            <tr><td>M10<\/td><td>10.5<\/td><td>20<\/td><td>2.0<\/td><\/tr>\n            <tr><td>M12<\/td><td>13.0<\/td><td>24<\/td><td>2.5<\/td><\/tr>\n            <tr><td>M16<\/td><td>17.0<\/td><td>30<\/td><td>3.0<\/td><\/tr>\n            <tr><td>M20<\/td><td>21.0<\/td><td>37<\/td><td>3.0<\/td><\/tr>\n            <tr><td>M24<\/td><td>25.0<\/td><td>44<\/td><td>4.0<\/td><\/tr>\n        <\/tbody><\/table>\n    <\/div><\/div>\n<\/div>\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\">\n        <a class=\"vc-related-link\" href=\"\/calculators\/bolt-dimensions-weight\/\">Bolt Dimensions<\/a><a class=\"vc-related-link\" href=\"\/calculators\/bolt-strength-calculator\/\">Bolt Strength<\/a><a class=\"vc-related-link\" href=\"\/calculators\/socket-head-cap-screw-iso4762\/\">SHCS ISO 4762<\/a>\n    <\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera<\/strong> \u2014 Professional field balancing instruments.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n<\/div>\n<script>\n(function(){\n    'use strict';\n    function $(id){return document.getElementById(id)}\n    function calculate(){\n        var o=$('vc-size').selectedOptions[0];\n        var id=o.getAttribute('data-id'),od=o.getAttribute('data-od'),t=o.getAttribute('data-t');\n        var sid=o.getAttribute('data-sid'),sod=o.getAttribute('data-sod'),st=o.getAttribute('data-st');\n        $('vc-r-flat').innerHTML=o.value+': '+id+' \u00d7 '+od+' \u00d7 '+t+' <span class=\"vc-rcard-unit\">mm<\/span>';\n        $('vc-r-fid').innerHTML=id+' <span class=\"vc-rcard-unit\">mm<\/span>';\n        $('vc-r-fod').innerHTML=od+' <span class=\"vc-rcard-unit\">mm<\/span>';\n        $('vc-r-ft').innerHTML=t+' <span class=\"vc-rcard-unit\">mm<\/span>';\n        $('vc-r-spring').innerHTML=sid+' \u00d7 '+sod+' \u00d7 '+st+' <span class=\"vc-rcard-unit\">mm (DIN 127)<\/span>';\n        $('vc-results').classList.add('vc-visible');\n    }\n    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ISO 7090 = same dimensions but with a chamfer (beveled edge) on one side to prevent digging into soft surfaces.<\/p>'},\n        {q:'What size washer for an M10 bolt?',a:'<p>ISO 7089: ID 10.5 mm, OD 20 mm, thickness 2.0 mm.<\/p>'},\n        {q:'When should I use spring washers?',a:'<p>Spring washers (DIN 127) were historically used for vibration resistance. Modern practice prefers Nord-Lock, Belleville washers, or threadlockers.<\/p>'},\n        {q:'What hardness should flat washers have?',a:'<p>ISO 7089: 200 HV minimum. For class 10.9\/12.9 bolts, use 300 HV washers to prevent embedding.<\/p>'},\n        {q:'Do I always need a washer?',a:'<p>Recommended when: oversized holes, soft\/painted surfaces, high-strength bolts, uneven surfaces, or slotted holes.<\/p>'}\n    ];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n    calculate();\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>ISO 7089\/7090 \u09aa\u09cd\u09b0\u09a4\u09bf \u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u0993\u09af\u09bc\u09be\u09b6\u09be\u09b0 \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8 \u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae\u0964 \u09ac\u09cb\u09b2\u09cd\u099f \u0986\u0995\u09be\u09b0 \u09aa\u09cd\u09b0\u09ac\u09c7\u09b6 \u0995\u09b0\u09c1\u09a8 \u09b8\u09ae\u09a4\u09b2 \u0993\u09af\u09bc\u09be\u09b6\u09be\u09b0 ID, OD, \u09aa\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac \u098f\u09ac\u0982 \u09b8\u09cd\u09aa\u09cd\u09b0\u09bf\u0982 \u0993\u09af\u09bc\u09be\u09b6\u09be\u09b0 \u09ae\u09be\u09a4\u09cd\u09b0\u09be \u09a6\u09c7\u0996\u09a4\u09c7\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100307","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100307\/revisions"}],"predecessor-version":[{"id":100614,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100307\/revisions\/100614"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}