{"id":1236,"date":"2025-05-02T14:44:40","date_gmt":"2025-05-02T06:44:40","guid":{"rendered":"https:\/\/hengoseal.com\/?p=1236"},"modified":"2025-05-02T14:44:40","modified_gmt":"2025-05-02T06:44:40","slug":"un-hydraulic-seal-guide","status":"publish","type":"post","link":"https:\/\/hengoseal.com\/ru\/un-hydraulic-seal-guide\/","title":{"rendered":"UN Hydraulic Seal: How to Choose the Best Rod Seal for OEM Cylinders in 2025?"},"content":{"rendered":"<p>Rod seal failure is one of the top reasons for hydraulic leakage. That\u2019s why selecting the right UN seal is critical for OEM cylinder performance.<\/p>\n<p>UN hydraulic seals are widely used in OEM-grade double-acting cylinders. These seals ensure smooth rod movement, prevent internal leakage, and withstand pressure up to 40MPa in mobile and industrial applications.<\/p>\n<p>Not sure which UN seal suits your system? Let\u2019s explore sizing, material, compatibility\u2014and more.<\/p>\n<h2>What is a UN hydraulic seal and how does it work?<\/h2>\n<p>A UN seal is a single-acting rod seal commonly used in standard hydraulic cylinders.<\/p>\n<p>It fits into a rectangular groove and creates a tight seal against the piston rod. Designed for medium to high-pressure systems, it\u2019s made from abrasion-resistant materials like NBR or FKM for longer life cycles.<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hengoseal.com\/wp-content\/uploads\/2025\/05\/UN-Hydraulic-Seals.jpg\" alt=\"placeholder_image\" \/><\/p>\n<p>UN seals are ideal for cylinders where space is limited and consistent bidirectional pressure control is needed. Their lip design offers high sealing performance with minimal friction.<\/p>\n<p>If you\u2019re using OEM equipment, our <a href=\"https:\/\/hengoseal.com\/ru\/product\/un-hydraulic-seal\/\" target=\"_blank\">UN hydraulic seals<\/a> are available in standard and custom sizes.<\/p>\n<h2>How do you choose the correct size for UN rod seals?<\/h2>\n<p>Choosing the correct size is key to preventing premature failure or pressure loss.<\/p>\n<p>To size a UN rod seal correctly, you need:<\/p>\n<ul>\n<li>Rod diameter (d)<\/li>\n<li>Groove width and depth<\/li>\n<li>Housing tolerance<\/li>\n<li>Working stroke length<\/li>\n<\/ul>\n<p>UN seals typically follow ISO 5597 or AS4716 standards. Use precision calipers or refer to OEM drawings when measuring. If unsure, check our guide on <a href=\"https:\/\/hengoseal.com\/ru\/how-to-measure-hydraulic-seals\/\" target=\"_blank\">how to measure hydraulic seals<\/a>.<\/p>\n<p>We also support custom sizing through our <a href=\"https:\/\/hengoseal.com\/ru\/custom-solutions\/\" target=\"_blank\">rubber seal customization service<\/a>.<\/p>\n<h2>Which material is best for UN hydraulic seals?<\/h2>\n<p>Material choice depends on pressure, temperature, and fluid type.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/th>\n<th>\u041c\u0430\u043a\u0441. \u0422\u0435\u043c\u043f.<\/th>\n<th>\u0421\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c \u0441 \u0436\u0438\u0434\u043a\u043e\u0441\u0442\u044f\u043c\u0438<\/th>\n<th>\u0412\u0430\u0440\u0438\u0430\u043d\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u041d\u0411\u0420<\/td>\n<td>100\u00b0C<\/td>\n<td>Mineral oils, air, water<\/td>\n<td>General hydraulics<\/td>\n<\/tr>\n<tr>\n<td>\u0424\u041a\u041c<\/td>\n<td>200\u00b0\u0421<\/td>\n<td>Fuel, synthetic oils<\/td>\n<td>High-temp systems<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0423<\/td>\n<td>90\u00b0C<\/td>\n<td>Abrasive media<\/td>\n<td>Low-speed heavy-duty use<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If your system runs at higher temperatures or handles chemical fluids, consider FKM over NBR. Need FDA-grade? Check out <a href=\"https:\/\/hengoseal.com\/ru\/silicone-o-rings-guide\/\" target=\"_blank\">\u0421\u0438\u043b\u0438\u043a\u043e\u043d\u043e\u0432\u044b\u0435 \u0443\u043f\u043b\u043e\u0442\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043a\u043e\u043b\u044c\u0446\u0430<\/a> for compliant alternatives.<\/p>\n<h2>What are the benefits of using UN seals in OEM cylinders?<\/h2>\n<p>UN seals are engineered for long-lasting performance in OEM hydraulic systems.<\/p>\n<p>Key advantages:<\/p>\n<ul>\n<li>Excellent sealing with minimal leakage<\/li>\n<li>Simple installation in standardized grooves<\/li>\n<li>Broad compatibility with ISO\/AS cylinder specs<\/li>\n<li>Available in multiple materials for different working media<\/li>\n<\/ul>\n<p>Unlike multi-piece sealing systems, UN seals offer a compact and efficient solution for mainstream hydraulic equipment. For heavy-duty buffering, pair it with a <a href=\"https:\/\/hengoseal.com\/ru\/product\/kdas-compact-seal\/\" target=\"_blank\">KDAS compact seal<\/a>.<\/p>\n<h2>When should you replace your UN rod seal?<\/h2>\n<p>Rod seals should be inspected regularly for:<\/p>\n<ul>\n<li>Leakage around the piston rod<\/li>\n<li>Hardening or cracking<\/li>\n<li>Surface scoring or shrinkage<\/li>\n<\/ul>\n<p>Typically, replacement is needed every 6\u201312 months in high-load environments.<\/p>\n<p>To avoid unscheduled downtime, use preemptive seal kits. We offer <a href=\"https:\/\/hengoseal.com\/ru\/product\/hydraulic-seal-kit-by-size\/\" target=\"_blank\">hydraulic seal kits<\/a> categorized by cylinder dimensions.<\/p>\n<h2>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n<p>UN hydraulic seals offer reliable, space-saving sealing for OEM and standard cylinders. Selecting the right size and material ensures long-lasting, leak-free performance.<\/p>\n<h2>Find the right seal for your cylinder<\/h2>\n<p>\ud83d\udce9 Mail:info@hengoseal.com<br \/>\n\ud83d\udcde WhatsApp\uff1a+86 17622979498<\/p>\n<h2>\u0421\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0442\u0435\u043c\u0430<\/h2>\n<ul>\n<li><a href=\"https:\/\/hengoseal.com\/ru\/product\/un-hydraulic-seal\/\" target=\"_blank\">\u0413\u0438\u0434\u0440\u0430\u0432\u043b\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435 UN | \u0423\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435 \u0448\u0442\u043e\u043a\u0430 OEM \u0434\u043b\u044f \u0433\u0438\u0434\u0440\u0430\u0432\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0446\u0438\u043b\u0438\u043d\u0434\u0440\u043e\u0432<\/a><\/li>\n<li><a href=\"https:\/\/hengoseal.com\/ru\/product\/kdas-compact-seal\/\" target=\"_blank\">KDAS Compact Seal | Buffer Seal for High-Pressure Cylinders<\/a><\/li>\n<li><a href=\"https:\/\/hengoseal.com\/ru\/how-to-measure-hydraulic-seals\/\" target=\"_blank\">\u041a\u0430\u043a \u0438\u0437\u043c\u0435\u0440\u0438\u0442\u044c \u0433\u0438\u0434\u0440\u0430\u0432\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u0438\u0434\u0435\u0430\u043b\u044c\u043d\u043e\u0439 \u0437\u0430\u043c\u0435\u043d\u044b?<\/a><\/li>\n<\/ul>\n<style>\n.faq-question {\ncursor: pointer;\nfont-weight: bold;\npadding: 10px;\nbackground-color: #f1f1f1;\nborder: 1px solid #ddd;\nmargin-bottom: 5px;\ncolor: #0073aa;\n}\n.faq-answer {\ndisplay: none;\npadding: 10px;\nborder-left: 3px solid #0073aa;\nbackground-color: #f9f9f9;\nmargin-bottom: 10px;\n}\n<\/style>\n<p><script>\ndocument.addEventListener('DOMContentLoaded', function() {\nconst questions = document.querySelectorAll('.faq-question');\nquestions.forEach(question => {\nquestion.addEventListener('click', function() {\nconst answer = this.nextElementSibling;\nanswer.style.display = answer.style.display === 'block' ? 'none' : 'block';\n});\n});\n});\n<\/script><br \/>\n<!-- JSON-LD FAQ Schema --><br \/>\n<script type=\"application\/ld+json\">\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\n\"@type\": \"Question\",\n\"name\": \"Can UN seals be used in both rod and piston applications?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"No, UN seals are strictly designed for rod sealing; use UP for pistons.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Do UN seals come in FDA-compliant materials?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, custom materials like FDA-grade NBR or Silicone are available on request.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"How do I avoid rod seal leakage after replacement?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Always clean the groove, use the correct lubricant, and install with proper tools.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Is FKM always better than NBR for rod seals?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Not always&mdash;FKM is better for temperature\/chemical resistance, but NBR offers excellent value for general use.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Can I reuse a removed UN seal?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"No, once deformed or stretched, seals lose elasticity and must be replaced.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"How do I match a UN seal with a cylinder model?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Refer to OEM codes or contact us with size specs&mdash;we can identify the right fit.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Do you support small MOQ or mixed-size kits?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"Yes, we provide low MOQ and <a href=\\\\\\\"https:\/\/hengoseal.com\/product\/hydraulic-seal-kit-by-size\/\\\\\\\" target=\\\\\\\"_blank\\\\\\\">kits by size.\"\n}\n},\n{\n\"@type\": \"Question\",\n\"name\": \"Is installation tool required for UN seals?\",\n\"acceptedAnswer\": {\n\"@type\": \"Answer\",\n\"text\": \"For small sizes, hand installation works. For larger seals, special tools improve precision.\"\n}\n}\n]\n}\n<\/script><\/p>\n<h2>\u041b\u044e\u0434\u0438 \u0442\u0430\u043a\u0436\u0435 \u0441\u043f\u0440\u0430\u0448\u0438\u0432\u0430\u044e\u0442<\/h2>\n<div class=\"faq-container\">\n<div class=\"faq-question\">1. Can UN seals be used in both rod and piston applications?<\/div>\n<div class=\"faq-answer\">No, UN seals are strictly designed for rod sealing; use UP for pistons.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">2. Do UN seals come in FDA-compliant materials?<\/div>\n<div class=\"faq-answer\">Yes, custom materials like FDA-grade NBR or Silicone are available on request.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">3. How do I avoid rod seal leakage after replacement?<\/div>\n<div class=\"faq-answer\">Always clean the groove, use the correct lubricant, and install with proper tools.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">4. Is FKM always better than NBR for rod seals?<\/div>\n<div class=\"faq-answer\">Not always\u2014FKM is better for temperature\/chemical resistance, but NBR offers excellent value for general use.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">5. Can I reuse a removed UN seal?<\/div>\n<div class=\"faq-answer\">No, once deformed or stretched, seals lose elasticity and must be replaced.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">6. How do I match a UN seal with a cylinder model?<\/div>\n<div class=\"faq-answer\">Refer to OEM codes or contact us with size specs\u2014we can identify the right fit.<\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">7. Do you support small MOQ or mixed-size kits?<\/div>\n<div class=\"faq-answer\"><a href=\"https:\/\/hengoseal.com\/ru\/product\/hydraulic-seal-kit-by-size\/\" target=\"_blank\">Yes, we provide low MOQ and kits by size.<\/a><\/div>\n<\/div>\n<div class=\"faq-container\">\n<div class=\"faq-question\">8. Is installation tool required for UN seals?<\/div>\n<div class=\"faq-answer\">For small sizes, hand installation works. For larger seals, special tools improve precision.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Rod seal failure is one of the top reasons for hydraulic leakage. That\u2019s why selecting the right UN seal is [&hellip;]<\/p>","protected":false},"author":1,"featured_media":1237,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-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":"","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-4)","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-4)","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-4)","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":""},"categories":[38],"tags":[],"class_list":["post-1236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydraulic-seals"],"_links":{"self":[{"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/posts\/1236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/comments?post=1236"}],"version-history":[{"count":0,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/posts\/1236\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/media\/1237"}],"wp:attachment":[{"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/media?parent=1236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/categories?post=1236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hengoseal.com\/ru\/wp-json\/wp\/v2\/tags?post=1236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}