{"product_id":"lm3-50uu-linear-motion-ball-bearings-id-3-50mm","title":"LM3-50UU Linear Motion Ball Bearings I.D 3-50mm O.D 7-80mm LM3-50 Linear Bearing","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eLM3–LM50 Linear Motion Ball Bearings — Smooth, Precise Linear Travel for CNC \u0026amp; Robotics\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or linear actuator demands repeatable, low-friction travel, even a marginal bearing can introduce backlash, vibration, and premature wear that derails your entire build. Engineers, makers, and automation integrators who rely on shaft-guided linear motion need a bearing that holds tight tolerances across thousands of cycles — without constant adjustment or replacement.\u003c\/p\u003e\n\u003cp\u003eThese LM-series linear motion ball bearings feature a hardened steel outer shell with recirculating ball retainer and a precision-ground bore. Available in bore diameters from 3 mm (0.118 in) to 50 mm (1.969 in) and corresponding outer diameters from 7 mm (0.276 in) to 80 mm (3.150 in), with body lengths ranging from 10 mm (0.394 in) to 100 mm (3.937 in). The UU suffix denotes double-lip rubber seals on both ends for contamination resistance.\u003c\/p\u003e\n\u003cp\u003eTypical applications include: linear guide rails on desktop CNC routers and laser cutters where smooth X\/Y axis travel is critical; 3D printer carriage and bed assemblies requiring low-friction, repeatable positioning; and industrial linear actuator systems, pick-and-place robots, and drawer slide mechanisms where compact bore-to-OD ratios save space without sacrificing load capacity.\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 use with standard LM-series round linear shafts (hardened, ground). Match the bearing bore (ID) to your shaft diameter — LM3 fits Ø3 mm shaft, LM4 fits Ø4 mm, up to LM50 fits Ø50 mm. Confirm housing bore matches the bearing OD before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These LM-Series Linear Motion Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003ePrecision Recirculating Ball Design\u003c\/strong\u003e\n\u003cp\u003eMultiple rows of recirculating steel balls distribute radial load evenly across the shaft, delivering smooth, consistent linear travel with minimal stick-slip.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eDouble-Lip Rubber Seals (UU Type)\u003c\/strong\u003e\n\u003cp\u003eBoth ends are sealed with double-lip rubber contact seals that block dust, swarf, and light moisture ingress — extending service life in workshop and light-industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Size Range: LM3 to LM50\u003c\/strong\u003e\n\u003cp\u003eBore diameters from 3 mm to 50 mm (0.118 in – 1.969 in) cover the full spectrum from compact 3D printer carriages to heavy-duty linear actuators — one product family for your entire project.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003eHardened Steel Outer Race\u003c\/strong\u003e\n\u003cp\u003eThe outer shell is manufactured from hardened steel, providing the structural rigidity needed to resist deformation under dynamic radial loads during continuous reciprocating motion.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eLow Starting Torque \u0026amp; Friction\u003c\/strong\u003e\n\u003cp\u003eBall-contact geometry minimises rolling resistance, allowing carriages and slides to start and stop with minimal drive force — ideal for stepper-motor-driven axes where torque budget is tight.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eAvailable in packs of 1, 2, or 4 per order so you can stock exactly what your build requires — whether prototyping a single axis or outfitting a multi-axis machine.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — LM-Series Linear Motion Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Series\u003c\/th\u003e\n\u003ctd\u003eLM3 \/ LM4 \/ LM5 \/ LM6 \/ LM8 \/ LM10 \/ LM12 \/ LM13 \/ LM16 \/ LM20 \/ LM25 \/ LM30 \/ LM35 \/ LM40 \/ LM50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eUU (Double-Lip Sealed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e3 mm – 50 mm (0.118 in – 1.969 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e7 mm – 80 mm (0.276 in – 3.150 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Length (L)\u003c\/th\u003e\n\u003ctd\u003e10 mm – 100 mm (0.394 in – 3.937 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Race Material\u003c\/th\u003e\n\u003ctd\u003eHardened Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Material\u003c\/th\u003e\n\u003ctd\u003eSteel (recirculating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeal Type\u003c\/th\u003e\n\u003ctd\u003eDouble-lip rubber contact seal (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotion Type\u003c\/th\u003e\n\u003ctd\u003eLinear (reciprocating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Shaft Type\u003c\/th\u003e\n\u003ctd\u003eHardened, ground round linear shaft (LM-series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 pc \/ 2 pcs \/ 4 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Load Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStatic Load Rating\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 LM bearing size for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bearing's inner diameter (ID) to your linear shaft diameter. For example, if your shaft is 8 mm, select LM8 (8×15×24 mm). Then confirm that your housing bore matches the bearing's outer diameter (OD) and that the body length (L) fits within your carriage block depth. All three dimensions — ID, OD, and L — are listed in the variant name in the format ID×OD×L mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat load can these linear bearings handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDynamic and static load ratings vary by size — larger bore bearings carry significantly higher loads. As a general guide, smaller sizes (LM3–LM8) are suited to light-duty applications such as 3D printer axes and small CNC routers, while mid-range sizes (LM10–LM20) handle moderate loads in laser cutters and pick-and-place systems. Larger sizes (LM25–LM50) are appropriate for heavier industrial linear actuators. Contact us to confirm specific load ratings for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe outer race and balls are manufactured from hardened steel, which provides good wear resistance but is not inherently stainless. The double-lip rubber seals (UU type) help exclude moisture and contaminants, extending service life in dusty or lightly humid workshop environments. For applications exposed to water, coolant, or corrosive atmospheres, consider pairing with a compatible lubricant or contact us about alternative seal options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat type of shaft do these bearings require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLM-series linear bearings are designed for use with hardened, precision-ground round linear shafts of the corresponding diameter. Using an unhardened or rough-finished shaft will accelerate ball and raceway wear and reduce bearing life. Ensure your shaft surface hardness is typically HRC 58–64 and surface roughness Ra ≤ 0.4 µm for optimal performance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to lubricate these bearings before use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLM-series bearings are typically supplied with a light factory grease. For best results, apply a thin film of lithium-based grease or light machine oil to the shaft before installation, and re-lubricate periodically depending on duty cycle and environment. The UU double-lip seals help retain lubricant inside the bearing, reducing re-lubrication frequency compared to open-type bearings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bearings in a 3D printer or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — LM-series linear bearings are one of the most widely used bearing types in desktop 3D printers (e.g., Prusa, Ender, and similar cartesian-style machines) and small CNC routers. Common sizes for 3D printers include LM8 (8 mm shaft) for X\/Y\/Z axes. For CNC routers, LM12, LM16, and LM20 are frequently used depending on the machine's shaft diameter. Select the size that matches your existing shaft or linear rail system.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between LM and LME series bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard LM-series bearings follow the JIS B 1559 dimensional standard, which is the most common format used in 3D printers and CNC equipment worldwide. LME-series bearings follow the European (ISO) standard and have different outer diameter and length dimensions for the same bore size. Always verify the OD and L dimensions against your housing drawing before ordering to ensure interchangeability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many bearings should I order for a typical build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost cartesian 3D printers use 6–12 linear bearings depending on axis configuration (typically 2 per rod, with 2–3 rods per axis). A standard CoreXY printer may use 4–6 LM8 bearings for the XY gantry plus 2–4 for the Z axis. CNC routers vary widely. We offer packs of 1, 2, or 4 — order the pack size that matches your build quantity to minimise per-unit cost.\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 size (ID×OD×L mm) and quantity 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 LM bearing size for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bearing's inner diameter (ID) to your linear shaft diameter. For example, if your shaft is 8 mm, select LM8 (8×15×24 mm). Then confirm that your housing bore matches the bearing's outer diameter (OD) and that the body length (L) fits within your carriage block depth.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load can these linear bearings handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load ratings vary by size. Smaller sizes (LM3–LM8) suit light-duty applications like 3D printer axes. Mid-range (LM10–LM20) handle moderate loads in laser cutters and pick-and-place systems. Larger sizes (LM25–LM50) are for heavier industrial linear actuators.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bearings corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The outer race and balls are hardened steel with good wear resistance. The double-lip rubber seals (UU type) exclude moisture and contaminants. For water or coolant exposure, pair with a compatible lubricant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What type of shaft do these bearings require?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LM-series bearings require hardened, precision-ground round linear shafts of the corresponding diameter. Shaft surface hardness should typically be HRC 58–64 with surface roughness Ra ≤ 0.4 µm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate these bearings before use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bearings are supplied with light factory grease. Apply a thin film of lithium-based grease or light machine oil to the shaft before installation and re-lubricate periodically. The UU seals help retain lubricant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bearings in a 3D printer or CNC router?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. LM8 is the most common size for 3D printer X\/Y\/Z axes. LM12, LM16, and LM20 are frequently used in CNC routers. Select the size matching your existing shaft diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between LM and LME series bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LM-series follows the JIS B 1559 standard (most common in 3D printers and CNC). LME-series follows the European ISO standard with different OD and length dimensions for the same bore. Verify OD and L against your housing drawing before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many bearings should I order for a typical build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Most cartesian 3D printers use 6–12 linear bearings. A CoreXY printer may use 4–6 LM8 bearings for XY plus 2–4 for Z. We offer packs of 1, 2, or 4 to match your build quantity.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"LM3(3x7x10) \/ 1","offer_id":52448879247634,"sku":"GLFBZRGSHXJZC5078x1","price":8.28,"currency_code":"USD","in_stock":true},{"title":"LM3(3x7x10) \/ 2","offer_id":52448879280402,"sku":"GLFBZRGSHXJZC5078x2","price":10.81,"currency_code":"USD","in_stock":true},{"title":"LM3(3x7x10) \/ 4","offer_id":52448879313170,"sku":"GLFBZRGSHXJZC5078x4","price":15.76,"currency_code":"USD","in_stock":true},{"title":"LM4(4x8x12) \/ 1","offer_id":52448879345938,"sku":"GLFBZRGSHXJZC5079x1","price":7.82,"currency_code":"USD","in_stock":true},{"title":"LM4(4x8x12) \/ 2","offer_id":52448879378706,"sku":"GLFBZRGSHXJZC5079x2","price":9.78,"currency_code":"USD","in_stock":true},{"title":"LM4(4x8x12) \/ 4","offer_id":52448879411474,"sku":"GLFBZRGSHXJZC5079x4","price":13.8,"currency_code":"USD","in_stock":true},{"title":"LM5(5x10x15) \/ 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