{"product_id":"linear-motion-ball-bearing-lme8uu-lme50uu-id-8mm-50mm-linear-ball-bearings","title":"Linear Motion Ball Bearing LME8UU~LME50UU ID=8mm~50mm Linear Ball Bearings","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eLinear Motion Ball Bearings LME Series — Precision Linear Travel for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen your linear axis binds, wobbles, or wears out prematurely, the root cause is almost always an undersized or mismatched bearing. Engineers, makers, and machine builders who demand repeatable, low-friction travel need a linear motion ball bearing that fits precisely and holds up under continuous cycling. The LME series linear ball bearings are designed for metric shaft systems and are a go-to choice for CNC router builds, 3D printer carriages, pick-and-place machines, and industrial linear actuators.\u003c\/p\u003e\n    \u003cp\u003eEach LME bearing consists of a hardened steel outer shell with recirculating ball tracks and a precision-ground bore sized to match standard metric shafts. Available in eight sizes from LME8UU (8×16×25 mm \/ 0.31×0.63×0.98 in) through LME50UU (50×75×100 mm \/ 1.97×2.95×3.94 in), the series covers the most common metric shaft diameters used in motion control applications. The compact UU double-seal configuration keeps contaminants out while retaining lubrication for extended service life.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: replacing worn carriage bearings on a CNC gantry for tighter positional accuracy; upgrading the Z-axis linear guides on a delta or Cartesian 3D printer to reduce layer-shift artifacts; and integrating into custom linear actuator assemblies for robotics or automated test fixtures where smooth, repeatable stroke motion is critical.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for standard metric round shafts. Match the bearing inner diameter (ID) to your shaft diameter — LME8UU fits Ø8 mm shafts, LME12UU fits Ø12 mm, and so on up to LME50UU for Ø50 mm shafts. Verify shaft tolerance (h6 recommended) for optimal fit.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Linear Motion Ball Bearings\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eEight Size Options in One Series\u003c\/strong\u003e\n        \u003cp\u003eFrom LME8UU to LME50UU, covering inner diameters of 8, 12, 16, 20, 25, 30, 40, and 50 mm — one consistent series for mixed-size machine builds.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eRecirculating Ball Track Design\u003c\/strong\u003e\n        \u003cp\u003eInternal recirculating ball circuits distribute load evenly across the shaft, enabling smooth, low-friction linear travel in both directions without stick-slip.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eDouble-Seal (UU) Configuration\u003c\/strong\u003e\n        \u003cp\u003eDual contact seals on both ends block dust, chips, and moisture from entering the ball tracks, extending service intervals in workshop and light-industrial environments.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eHardened Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eOuter shell and ball elements are manufactured from hardened bearing steel, providing the rigidity and wear resistance needed for high-cycle linear motion applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eStandard Metric Dimensions\u003c\/strong\u003e\n        \u003cp\u003eOuter diameter and length conform to LME-series metric standards, making these bearings direct drop-in replacements for existing LME housings and pillow blocks.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e\n        \u003cp\u003eSuitable for CNC machines, 3D printers, laser cutters, linear actuators, robotic arms, and automated assembly equipment requiring precise, repeatable linear motion.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Linear Motion Ball Bearings\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eLME (Metric, Double-Seal UU)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Models\u003c\/th\u003e\n\u003ctd\u003eLME8UU, LME12UU, LME16UU, LME20UU, LME25UU, LME30UU, LME40UU, LME50UU\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 12 mm \/ 16 mm \/ 20 mm \/ 25 mm \/ 30 mm \/ 40 mm \/ 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSize Range (OD × Length)\u003c\/th\u003e\n\u003ctd\u003e16×25 mm (LME8UU) to 75×100 mm (LME50UU)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHardened bearing steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSeal Type\u003c\/th\u003e\n\u003ctd\u003eDouble contact seal (UU)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShaft Compatibility\u003c\/th\u003e\n\u003ctd\u003eStandard metric round shafts (h6 tolerance recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMotion Type\u003c\/th\u003e\n\u003ctd\u003eLinear (recirculating ball)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eFactory pre-lubricated\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right LME bearing size for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bearing's inner diameter (ID) to your shaft diameter. For example, if your linear shaft is 12 mm in diameter, select the LME12UU. The outer diameter and length are fixed per model and must also fit your housing or pillow block. Check the size table above for full dimensions before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat shaft tolerance works best with LME series bearings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAn h6 shaft tolerance is recommended for a smooth sliding fit with minimal radial play. Shafts with looser tolerances (h7 or beyond) may introduce unwanted play, while interference fits can restrict ball movement. Use precision-ground or hardened linear shafts for best results.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bearings suitable for outdoor or high-humidity environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe double-seal (UU) design provides meaningful protection against dust and light moisture, making these bearings suitable for workshop and light-industrial use. For prolonged outdoor exposure or washdown environments, consider supplementing with external sealing or periodic re-lubrication to maintain performance.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use LME bearings as direct replacements for LM or SC series bearings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLME bearings follow a different dimensional standard than LM (Japanese) or SC series bearings. While the inner diameter may match, the outer diameter and length often differ. Always verify OD and length against your housing specifications before substituting. LME bearings are direct replacements for other LME-series components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many cycles can these linear bearings handle before replacement?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eService life depends on load, speed, lubrication, and shaft surface finish. Under typical light-to-medium loads with proper lubrication and a hardened shaft, LME bearings are rated for millions of travel cycles. Heavier loads or contaminated environments will reduce service life — inspect periodically and re-lubricate as needed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these bearings come pre-lubricated?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, each LME bearing is factory pre-lubricated and ready to install. For high-duty-cycle applications or after extended storage, applying a small amount of compatible lithium-based or NLGI #2 grease through the seal before installation is recommended to ensure optimal performance from the start.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat applications are LME linear ball bearings best suited for?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLME bearings are well-suited for CNC router and milling machine carriages, 3D printer X\/Y\/Z axes, laser cutter gantries, linear actuators, robotic arm joints, and automated assembly or pick-and-place equipment. Any application requiring smooth, repeatable linear travel on a metric round shaft is a strong candidate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your model and size above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right LME bearing size for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bearing's inner diameter (ID) to your shaft diameter. For example, if your linear shaft is 12 mm in diameter, select the LME12UU. The outer diameter and length are fixed per model and must also fit your housing or pillow block.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What shaft tolerance works best with LME series bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"An h6 shaft tolerance is recommended for a smooth sliding fit with minimal radial play. Shafts with looser tolerances may introduce unwanted play, while interference fits can restrict ball movement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bearings suitable for outdoor or high-humidity environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The double-seal (UU) design provides meaningful protection against dust and light moisture. For prolonged outdoor exposure or washdown environments, supplement with external sealing or periodic re-lubrication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use LME bearings as direct replacements for LM or SC series bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LME bearings follow a different dimensional standard than LM or SC series bearings. Always verify OD and length against your housing specifications before substituting.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many cycles can these linear bearings handle before replacement?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Under typical light-to-medium loads with proper lubrication and a hardened shaft, LME bearings are rated for millions of travel cycles. Heavier loads or contaminated environments will reduce service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these bearings come pre-lubricated?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, each LME bearing is factory pre-lubricated and ready to install. For high-duty-cycle applications, applying a small amount of compatible lithium-based or NLGI #2 grease before installation is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What applications are LME linear ball bearings best suited for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LME bearings are well-suited for CNC router carriages, 3D printer axes, laser cutter gantries, linear actuators, robotic arm joints, and automated assembly equipment requiring smooth, repeatable linear travel on a metric round shaft.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"LME8UU \/ 8x16x25mm","offer_id":52448881705234,"sku":"WXB074048x1","price":3.93,"currency_code":"USD","in_stock":true},{"title":"LME12UU \/ 12x22x32mm","offer_id":52448881738002,"sku":"WXB074049x1","price":4.88,"currency_code":"USD","in_stock":true},{"title":"LME16UU \/ 16x26x36mm","offer_id":52448881770770,"sku":"WXB074050x1","price":6.05,"currency_code":"USD","in_stock":true},{"title":"LME20UU \/ 20x32x45mm","offer_id":52448881803538,"sku":"WXB074051x1","price":7.87,"currency_code":"USD","in_stock":true},{"title":"LME25UU \/ 25x40x58mm","offer_id":52448881836306,"sku":"WXB074052x1","price":15.08,"currency_code":"USD","in_stock":true},{"title":"LME30UU \/ 30x47x68mm","offer_id":52448881869074,"sku":"WXB074053x1","price":22.64,"currency_code":"USD","in_stock":true},{"title":"LME40UU \/ 40x62x80mm","offer_id":52448881901842,"sku":"WXB074054x1","price":45.27,"currency_code":"USD","in_stock":true},{"title":"LME50UU \/ 50x75x100mm","offer_id":52448881934610,"sku":"WXB074055x1","price":79.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_11c52bb8-5f28-4a6a-9f0b-1141a3f34fce.jpg?v=1783686093","url":"https:\/\/homediyer.com\/products\/linear-motion-ball-bearing-lme8uu-lme50uu-id-8mm-50mm-linear-ball-bearings","provider":"HomeDIYer","version":"1.0","type":"link"}