{"product_id":"mr52zz-mr149zz-mini-metal-double-shielded-small-ball-bearings-miniature-model","title":"MR52zz- MR149zz Mini Metal Double Shielded Small Ball Bearings Miniature Model","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMR-Series Miniature Ball Bearings — Compact Double-Shield Precision for Tight Spaces\u003c\/h2\u003e\n\u003cp\u003eWhen a repair stalls because a worn bearing is buried inside a motor, RC drivetrain, or precision instrument, finding the right miniature replacement fast matters. Hobbyists, robotics builders, and small-appliance repair technicians who work with sub-20mm assemblies need bearings that fit exactly, spin freely, and stay put — this MR-series miniature ball bearing range covers sizes MR52ZZ through MR148ZZ to match the most common compact applications.\u003c\/p\u003e\n\u003cp\u003eEach miniature ball bearing features a steel inner and outer race with a full complement of steel balls and dual metal shields (ZZ designation). Outer diameters range from approximately 5 mm (MR52ZZ) to 14 mm (MR148ZZ), with bore diameters from approximately 2 mm to 8 mm (roughly 0.08 in – 0.31 in). Select your exact type from the variant dropdown; quantity options of 1, 5, or 10 pieces allow single-unit testing or batch restocking.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include RC car wheel hubs and gearboxes, 3D printer axis carriages requiring low-friction miniature ball bearings, brushless motor rotor support in drones and power tools, and small robotic joint assemblies where space-saving double-shielded bearings reduce contamination without adding bulk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard MR-series bore and OD dimensions. Verify your bore diameter, outer diameter, and width against your housing spec before ordering. See variant options for exact size per type.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Miniature Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eDual Metal Shields (ZZ):\u003c\/strong\u003e Both sides enclosed with steel shields to block dust, debris, and light splash — extending service life in exposed environments without requiring external seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eFull-Complement Steel Ball Set:\u003c\/strong\u003e Precision-ground steel balls distributed evenly around the raceway deliver consistent radial load capacity and smooth rotation at operating speeds typical of hobby and light-industrial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Range (MR52ZZ – MR148ZZ):\u003c\/strong\u003e 17 distinct types covering bore diameters from ~2 mm to ~8 mm and outer diameters from ~5 mm to ~14 mm — one catalog covers the most common miniature bearing footprints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSteel Race Construction:\u003c\/strong\u003e Inner and outer races machined from bearing-grade steel, providing the dimensional stability needed for press-fit or slip-fit housing installations in tight-tolerance assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Options:\u003c\/strong\u003e Available in 1, 5, or 10-piece quantities — order a single unit to confirm fit before committing to a multi-pack, or stock up for ongoing maintenance and build projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In MR-Series Compatibility:\u003c\/strong\u003e Conforms to standard MR-series dimensional conventions, making these a direct replacement for worn bearings in RC vehicles, 3D printers, drones, and small motors without custom machining.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Miniature Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Series\u003c\/th\u003e\n\u003ctd\u003eMR (Miniature Radial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Types\u003c\/th\u003e\n\u003ctd\u003eMR52ZZ, MR62ZZ, MR63ZZ, MR74ZZ, MR83ZZ, MR84ZZ, MR85ZZ, MR95ZZ, MR104ZZ, MR105ZZ, MR106ZZ, MR115ZZ, MR117ZZ, MR126ZZ, MR128ZZ, MR137ZZ, MR148ZZ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShield Type\u003c\/th\u003e\n\u003ctd\u003eDouble metal shield (ZZ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically 2 mm – 8 mm (0.08 in – 0.31 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically 5 mm – 14 mm (0.20 in – 0.55 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRace Material\u003c\/th\u003e\n\u003ctd\u003eBearing-grade steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Material\u003c\/th\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eFactory-greased (pre-lubricated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 5 Pcs \/ 10 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFit Type\u003c\/th\u003e\n\u003ctd\u003ePress-fit or slip-fit (verify housing tolerance)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I identify which MR bearing size I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure three dimensions on your existing bearing or housing: bore diameter (inner hole), outer diameter, and width. The MR designation encodes these — for example, MR52ZZ has a 2 mm bore and 5 mm outer diameter. Use calipers for accuracy, then match to the type in the variant dropdown. If the housing is still assembled, consult the equipment's parts diagram or service manual for the bearing reference number.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the ZZ designation mean, and do I need sealed bearings instead?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZZ indicates dual metal shields on both sides of the bearing. Shields block solid contaminants and retain grease but are not fully waterproof. For applications exposed to water spray or submersion, a rubber-sealed bearing (2RS designation) would provide better protection. For dry, indoor, or lightly dusty environments — such as 3D printers, RC cars, and robotics — ZZ shields are sufficient and allow slightly lower friction than rubber seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings strong enough for my RC car or drone motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMR-series bearings are rated for light-to-moderate radial loads typical of hobby RC drivetrains, drone motor rotors, and small brushless motors. They are not designed for heavy axial (thrust) loads or high-impact shock loads. For standard RC wheel hubs, gearbox idler shafts, and motor end caps in the MR size range, these bearings perform within expected parameters. If your application involves sustained high RPM above 20,000 or significant axial loading, contact us to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these bearings corrode if used outdoors or in humid conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe steel races and shields can develop surface rust if exposed to prolonged moisture without protection. For outdoor RC use or humid workshop environments, apply a light coat of bearing grease or corrosion-inhibiting oil to the exterior after installation. The factory pre-grease inside the shields helps protect the balls and raceways during normal operation, but the outer surfaces benefit from periodic maintenance in wet conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as a direct replacement for a bearing with the same MR number from another brand?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. MR-series dimensions follow standardized conventions, so an MR84ZZ from this listing will have the same bore, outer diameter, and width as an MR84ZZ from other manufacturers. Verify the three key dimensions (bore, OD, width) against your original bearing before installing to confirm the fit, as minor tolerance variations between brands can affect press-fit tightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 piece first or go straight to a 5- or 10-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIf you are replacing a bearing in an existing assembly for the first time, ordering 1 piece to confirm the fit and clearance is a practical approach. Once you have verified the correct type for your application, the 5- or 10-piece options offer a lower per-unit cost and keep spares on hand for future maintenance — useful for RC hobbyists running multiple vehicles or builders managing a fleet of 3D printers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Type and Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"MR52ZZ \/ 1Pcs","offer_id":52409678594322,"sku":"GY$$$GLBZSJ073853x1","price":5.1,"currency_code":"USD","in_stock":true},{"title":"MR62ZZ \/ 1Pcs","offer_id":52409678627090,"sku":"GY$$$GLBZSJ073852x1","price":4.95,"currency_code":"USD","in_stock":true},{"title":"MR63ZZ \/ 1Pcs","offer_id":52409678659858,"sku":"GY$$$GLBZSJ073861x1","price":4.95,"currency_code":"USD","in_stock":true},{"title":"MR74ZZ \/ 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