{"product_id":"zro2-full-ceramic-ball-bearings-mr-6700-series","title":"Zirconium Dioxide Full Ceramic Bearings ZrO2 Ball Bearing MR85-6708 Multi-model","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eZrO2 Full Ceramic Ball Bearings — Corrosion-Resistant Precision for Demanding Environments\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel bearings corrode, seize, or interfere with sensitive equipment, engineers and DIY builders turn to full ceramic alternatives. These zirconium dioxide (ZrO2) full ceramic ball bearings are designed for applications where moisture, chemicals, electrical conductivity, or magnetic fields make metal bearings impractical — from food-processing machinery and marine hardware to medical devices and RC equipment.\u003c\/p\u003e\n\u003cp\u003eEach bearing is constructed entirely from ZrO2 ceramic — races, balls, and cage — with no metal components. Available in MR-series miniature sizes (inner diameter typically 3–10 mm \/ 0.12–0.39 in) and 6700-series standard sizes (inner diameter typically 10–40 mm \/ 0.39–1.57 in), with thickness ranging from 2 to 8 mm (0.08–0.31 in). Select your model and exact size (ID × OD × Width in mm) from the variant options above.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include corrosive-environment spindles where ZrO2 ceramic ball bearings outperform stainless steel, non-magnetic instrument assemblies requiring full ceramic bearing solutions, and high-speed RC motor or drone pivot points where lightweight ceramic bearings reduce rotational mass.\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 Drop-in dimensional replacement for same-model steel or hybrid bearings. Verify ID × OD × Width against your housing spec before ordering. See variant options for exact dimensions.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These ZrO2 Full Ceramic Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧪\u003c\/span\u003e\u003cstrong\u003e100% Zirconium Dioxide Construction\u003c\/strong\u003e — Races, balls, and retainer are all ZrO2 ceramic; zero metal contact surfaces eliminate galvanic corrosion and rust entirely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚫\u003c\/span\u003e\u003cstrong\u003eNon-Magnetic \u0026amp; Non-Conductive\u003c\/strong\u003e — ZrO2 is electrically insulating and magnetically neutral, making these bearings suitable for MRI-adjacent equipment, motors with encoder feedback, and EMI-sensitive assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cstrong\u003eCorrosion Resistance in Wet \u0026amp; Chemical Environments\u003c\/strong\u003e — Withstands prolonged exposure to water, salt spray, mild acids, and alkaline solutions where steel bearings would degrade within weeks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eLower Density Than Steel\u003c\/strong\u003e — ZrO2 ceramic is approximately 40% lighter than bearing steel by volume, reducing centrifugal load at high RPM and lowering overall assembly weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e\u003cstrong\u003eBroad Operating Temperature Range\u003c\/strong\u003e — Ceramic maintains dimensional stability across a wider temperature range than standard steel, suitable for both cryogenic and elevated-temperature applications (typically −40 °C to +300 °C \/ −40 °F to +572 °F).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Selection — MR \u0026amp; 6700 Series\u003c\/strong\u003e — Over 50 size combinations from MR63 (3×6×2.5 mm) to 6708 (40×50×6 mm) cover miniature instrument bearings through mid-range industrial sizes in a single listing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — ZrO2 Full Ceramic Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eZirconium Dioxide (ZrO2) — full ceramic (races, balls, retainer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eMR-series (miniature) \u0026amp; 6700-series (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (range: 3–40 mm \/ 0.12–1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (range: 6–50 mm \/ 0.24–1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth \/ Thickness\u003c\/th\u003e\n\u003ctd\u003eSee variant options (range: 2–8 mm \/ 0.08–0.31 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically −40 °C to +300 °C (−40 °F to +572 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrical Conductivity\u003c\/th\u003e\n\u003ctd\u003eNon-conductive (insulating ceramic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnetic Properties\u003c\/th\u003e\n\u003ctd\u003eNon-magnetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eDry \/ unlubricated (ceramic-on-ceramic); compatible with most lubricants if required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeal \/ Shield\u003c\/th\u003e\n\u003ctd\u003eOpen (unsealed) — contact us to confirm if shielded variants are needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece per unit ordered\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 choose the correct bearing size for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the Inner Diameter (ID), Outer Diameter (OD), and Width to your housing and shaft dimensions. The size format in the variant options is ID × OD × Width in millimeters. For example, \"8×22×7\" means an 8 mm bore, 22 mm outer diameter, and 7 mm wide. Measure your existing bearing or housing bore with calipers before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between MR-series and 6700-series bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMR-series bearings are miniature bearings with inner diameters typically ranging from 3 to 10 mm, commonly used in RC vehicles, drones, small motors, and precision instruments. The 6700-series follows standard ISO metric dimensions with larger bore sizes (10–40 mm in this listing) and is used in light industrial machinery, pumps, and larger assemblies. Both series in this listing are full ZrO2 ceramic construction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre ZrO2 ceramic bearings stronger than steel bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZrO2 ceramic has high compressive strength and hardness (approximately 8–8.5 on the Mohs scale), but ceramic is more brittle than steel under impact or shock loads. These bearings excel in applications with steady radial or axial loads in corrosive or non-magnetic environments. For heavy shock-load applications, consult your load ratings before substituting ceramic for steel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bearings require lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFull ceramic ZrO2 bearings can run dry in many applications because ceramic-on-ceramic contact generates less friction than metal. However, adding a compatible lubricant (PTFE-based or ceramic-compatible grease) can extend service life in high-speed or high-load conditions. Avoid petroleum-based greases that may degrade at elevated temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings suitable for saltwater or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. ZrO2 ceramic is highly resistant to saltwater corrosion, making these bearings a practical choice for marine hardware, underwater robotics, kayak rudder pivots, and fishing reel components where stainless steel bearings may still corrode over time. The fully ceramic construction means there are no metal surfaces to oxidize.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bearings as a direct drop-in replacement for steel bearings of the same model number?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn most cases, yes — ZrO2 ceramic bearings in standard MR and 6700 series follow the same dimensional standards as their steel counterparts, so the ID, OD, and width are interchangeable. Always verify the exact dimensions (ID × OD × Width) match your housing before installation, as tolerances can vary slightly between manufacturers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum operating speed for these ceramic bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMaximum RPM depends on the specific size, load, and lubrication conditions. Smaller-diameter bearings (e.g., MR63, MR74) can typically operate at higher RPM than larger ones. As a general guideline, full ceramic bearings can sustain higher speeds than equivalent steel bearings due to lower density and reduced centrifugal ball load. Contact us to confirm speed ratings for your specific model and application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model and Size(mm) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"MR117 \/ 7*11*3","offer_id":52409746817298,"sku":"KEYLA057105x1","price":10.8,"currency_code":"USD","in_stock":true},{"title":"MR126 \/ 6*12*4","offer_id":52409746850066,"sku":"KEYLA057106x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"MR128 \/ 8*12*3.5","offer_id":52409746882834,"sku":"KEYLA057107x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"MR148 \/ 8*14*4","offer_id":52409746915602,"sku":"KEYLA057108x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"MR74 \/ 4*7*2","offer_id":52409746948370,"sku":"KEYLA057109x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"MR85 \/ 5*8*2.5","offer_id":52409746981138,"sku":"KEYLA057110x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"MR84 \/ 4*8*3","offer_id":52409747013906,"sku":"KEYLA057111x1","price":10.8,"currency_code":"USD","in_stock":true},{"title":"MR63 \/ 3*6*2.5","offer_id":52409747046674,"sku":"KEYLA057112x1","price":12.95,"currency_code":"USD","in_stock":true},{"title":"MR74 \/ 4*7*2.5","offer_id":52409747079442,"sku":"KEYLA057113x1","price":12.95,"currency_code":"USD","in_stock":true},{"title":"MR85 \/ 5*8*2","offer_id":52409747112210,"sku":"KEYLA057114x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"6700 \/ 10*15*3","offer_id":52409747144978,"sku":"KEYLA057115x1","price":17.23,"currency_code":"USD","in_stock":true},{"title":"6700 \/ 10*15*4","offer_id":52409747177746,"sku":"KEYLA057116x1","price":16.51,"currency_code":"USD","in_stock":true},{"title":"6701 \/ 12*18*4","offer_id":52409747210514,"sku":"KEYLA057117x1","price":17.23,"currency_code":"USD","in_stock":true},{"title":"6702 \/ 15*21*4","offer_id":52409747243282,"sku":"KEYLA057118x1","price":17.94,"currency_code":"USD","in_stock":true},{"title":"6703 \/ 17*23*4","offer_id":52409747276050,"sku":"KEYLA057119x1","price":19.73,"currency_code":"USD","in_stock":true},{"title":"6704 \/ 20*27*4","offer_id":52409747308818,"sku":"KEYLA057120x1","price":21.52,"currency_code":"USD","in_stock":true},{"title":"6705 \/ 25*32*4","offer_id":52409747341586,"sku":"KEYLA057121x1","price":26.51,"currency_code":"USD","in_stock":true},{"title":"6706 \/ 30*37*4","offer_id":52409747374354,"sku":"KEYLA057122x1","price":35.09,"currency_code":"USD","in_stock":true},{"title":"6707 \/ 35*44*5","offer_id":52409747407122,"sku":"KEYLA057123x1","price":52.94,"currency_code":"USD","in_stock":true},{"title":"6708 \/ 40*50*6","offer_id":52409747439890,"sku":"KEYLA057124x1","price":66.52,"currency_code":"USD","in_stock":true},{"title":"603 \/ 3*9*3","offer_id":52409747472658,"sku":"KEYLA057125x1","price":10.8,"currency_code":"USD","in_stock":true},{"title":"604 \/ 4*12*4","offer_id":52409747505426,"sku":"KEYLA057126x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"605 \/ 5*14*5","offer_id":52409747538194,"sku":"KEYLA057127x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"606 \/ 6*17*6","offer_id":52409747570962,"sku":"KEYLA057128x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"607 \/ 7*19*6","offer_id":52409747603730,"sku":"KEYLA057129x1","price":11.08,"currency_code":"USD","in_stock":true},{"title":"608 \/ 8*22*7","offer_id":52409747636498,"sku":"KEYLA057130x1","price":9.08,"currency_code":"USD","in_stock":true},{"title":"609 \/ 9*24*7","offer_id":52409747669266,"sku":"KEYLA057131x1","price":12.16,"currency_code":"USD","in_stock":true},{"title":"683 \/ 3*7*2","offer_id":52409747702034,"sku":"KEYLA057132x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"683 \/ 3*7*3","offer_id":52409747734802,"sku":"KEYLA057133x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"684 \/ 4*9*2.5","offer_id":52409747767570,"sku":"KEYLA057134x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"684 \/ 4*9*4","offer_id":52409747800338,"sku":"KEYLA057135x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"685 \/ 5*11*3","offer_id":52409747833106,"sku":"KEYLA057136x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"685 \/ 5*11*4","offer_id":52409747865874,"sku":"KEYLA057137x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"685 \/ 5*11*5","offer_id":52409747898642,"sku":"KEYLA057138x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"686 \/ 6*13*3.5","offer_id":52409747931410,"sku":"KEYLA057139x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"686 \/ 6*13*5","offer_id":52409747964178,"sku":"KEYLA057140x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"687 \/ 7*14*3.5","offer_id":52409747996946,"sku":"KEYLA057141x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"687 \/ 7*14*5","offer_id":52409748029714,"sku":"KEYLA057142x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"688 \/ 8*16*4","offer_id":52409748062482,"sku":"KEYLA057143x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"688 \/ 8*16*5","offer_id":52409748095250,"sku":"KEYLA057144x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"689 \/ 9*17*4","offer_id":52409748128018,"sku":"KEYLA057145x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"689 \/ 9*17*5","offer_id":52409748160786,"sku":"KEYLA057146x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"623 \/ 3*10*4","offer_id":52409748193554,"sku":"KEYLA057147x1","price":10.73,"currency_code":"USD","in_stock":true},{"title":"624 \/ 4*13*5","offer_id":52409748226322,"sku":"KEYLA057148x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"625 \/ 5*16*5","offer_id":52409748259090,"sku":"KEYLA057149x1","price":10.44,"currency_code":"USD","in_stock":true},{"title":"626 \/ 6*19*6","offer_id":52409748291858,"sku":"KEYLA057150x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"627 \/ 7*22*7","offer_id":52409748324626,"sku":"KEYLA057151x1","price":11.08,"currency_code":"USD","in_stock":true},{"title":"628 \/ 8*24*8","offer_id":52409748357394,"sku":"KEYLA057152x1","price":12.87,"currency_code":"USD","in_stock":true},{"title":"629 \/ 9*26*8","offer_id":52409748390162,"sku":"KEYLA057153x1","price":14.29,"currency_code":"USD","in_stock":true},{"title":"693 \/ 3*8*3","offer_id":52409748422930,"sku":"KEYLA057154x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"693 \/ 3*8*4","offer_id":52409748455698,"sku":"KEYLA057155x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"694 \/ 4*11*4","offer_id":52409748488466,"sku":"KEYLA057156x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"695 \/ 5*13*4","offer_id":52409748521234,"sku":"KEYLA057157x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"696 \/ 6*15*5","offer_id":52409748554002,"sku":"KEYLA057158x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"697 \/ 7*17*5","offer_id":52409748586770,"sku":"KEYLA057159x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"698 \/ 8*19*6","offer_id":52409748619538,"sku":"KEYLA057160x1","price":11.08,"currency_code":"USD","in_stock":true},{"title":"699 \/ 9*20*6","offer_id":52409748652306,"sku":"KEYLA057161x1","price":11.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_2b87ee34-dd49-4732-9d70-8745b9ab8999.jpg?v=1782230379","url":"https:\/\/homediyer.com\/products\/zro2-full-ceramic-ball-bearings-mr-6700-series","provider":"HomeDIYer","version":"1.0","type":"link"}