{"id":17124,"date":"2023-05-18T08:28:29","date_gmt":"2023-05-18T08:28:29","guid":{"rendered":"https:\/\/monroeengineering.com\/blog\/?p=17124"},"modified":"2024-12-03T20:22:24","modified_gmt":"2024-12-03T20:22:24","slug":"an-introduction-to-o-ring-sizes-and-what-they-mean","status":"publish","type":"post","link":"https:\/\/monroeengineering.com\/blog\/an-introduction-to-o-ring-sizes-and-what-they-mean\/","title":{"rendered":"An Introduction to O-Ring Sizes and What They Mean"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"213\" src=\"https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2021\/06\/monroe-o-ringsa144144.jpg\" alt=\"Spring-energized seals by Monroe Engineering\" class=\"wp-image-9542\" srcset=\"https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2021\/06\/monroe-o-ringsa144144.jpg 320w, https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2021\/06\/monroe-o-ringsa144144-300x200.jpg 300w\" sizes=\"auto, (max-width: 320px) 100vw, 320px\" \/><\/figure>\n<\/div>\n\n\n<p>You can&#8217;t choose the right O-ring without considering the size. O-rings are mechanical seals that feature a circular, ring-like shape. They are typically used to seal mating surfaces. Even when exposed to pressurized liquid or gas, O-rings will continue to seal the mating surface with which they are used.<\/p>\n\n\n\n<p>O-rings, however, are available in different sizes. Some of them are bigger than others. Whether you&#8217;re planning to use it on a coolant line, gas line, air line or any other pressurized line, you&#8217;ll need to choose an O-ring in the right size.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Inside Diameter<\/h2>\n\n\n\n<p>Inside diameter is exactly what it sounds like: the inner diameter of an O-ring. All O-rings have an inside diameter. It represents the distance from the inside of an O-ring &#8212; at the O-ring&#8217;s widest section &#8212; to the opposite side.<\/p>\n\n\n\n<p>O-rings with a large inside diameter can accommodate larger lines than those with a small inside diameter. They consist of a larger, wider ring-shaped mechanical seal. You can place these large O-rings around equally large pipes, hoses and lines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cross Section<\/h2>\n\n\n\n<p>In addition to inside diameter, there&#8217;s cross-sectional width. The cross section is the width of an O-ring. It represents the thickness of the tangible part of an O-ring.  The cross section doesn&#8217;t take into account the inside diameter. Instead, it focuses specifically on the physical part, which is the rubber or elastomeric ring.<\/p>\n\n\n\n<p>The cross section width of an O-ring will almost always be lower than the inside diameter. The inside diameter covers the entire distance across the center of an O-ring. The cross section, on the other hand, only covers the distance across the physical part of an O-ring. Therefore, most O-rings have a much smaller cross section than inside diameter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aerospace Standard Sizes<\/h2>\n\n\n\n<p>When shopping for O-rings, you may see a dash number for its size. Most O-rings use the Aerospace Standard 568 sizing specification. Published by the Society of Automotive Engineers (SAE), it uses a set of numbers to define O-ring sizes.<\/p>\n\n\n\n<p>The Aerospace Standard 568 simplifies the process of evaluating O-ring sizes. Each O-ring is given a dash number. You can refer to these dash numbers to find the inside diameter and cross section of O-rings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In Conclusion<\/h2>\n\n\n\n<p>O-rings are available in different sizes. When shopping for an O-ring, you should pay attention to the inside diameter and cross section. The inside diameter represents the distance across the inner section of an O-ring at its widest point. The cross section represents the thickness of the elastomeric ring.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can&#8217;t choose the right O-ring without considering the size. O-rings are mechanical seals that feature a circular, ring-like shape. They are typically used to seal mating surfaces. Even when exposed to pressurized liquid or gas, O-rings will continue to &hellip; <a class=\"continue-reading\" href=\"https:\/\/monroeengineering.com\/blog\/an-introduction-to-o-ring-sizes-and-what-they-mean\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":9542,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10016,84],"tags":[735,8434],"class_list":["post-17124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-o-rings","category-seals","tag-o-rings","tag-seals"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>An Introduction to O-Ring Sizes and What They Mean | Seals | OneMonroe<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/monroeengineering.com\/blog\/an-introduction-to-o-ring-sizes-and-what-they-mean\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"An Introduction to O-Ring Sizes and What They Mean | Seals | OneMonroe\" \/>\n<meta property=\"og:description\" content=\"You can&#8217;t choose the right O-ring without considering the size. O-rings are mechanical seals that feature a circular, ring-like shape. They are typically used to seal mating surfaces. Even when exposed to pressurized liquid or gas, O-rings will continue to &hellip; Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/monroeengineering.com\/blog\/an-introduction-to-o-ring-sizes-and-what-they-mean\/\" \/>\n<meta property=\"og:site_name\" content=\"OneMonroe\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/monroeengineering\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-18T08:28:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-03T20:22:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2021\/06\/monroe-o-ringsa144144.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"320\" \/>\n\t<meta property=\"og:image:height\" content=\"213\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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