{"product_id":"zirconia-ceramic-bearings-zro2-full-ball-deep-groove-604-609","title":"Zirconia All Ceramic Bearings ZrO2 Full Ball Deep Groove Ball Bearings 604~609","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eZrO2 Full Ceramic Deep Groove Ball Bearings — Corrosion-Resistant Precision for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel bearings corrode, seize, or interfere with sensitive electronics, engineers and makers reach for a ceramic alternative. These ZrO2 zirconia ceramic deep groove ball bearings are designed for hobbyists, engineers, and precision builders who need reliable rotation in wet, chemical, or magnetically sensitive environments — without the maintenance overhead of steel.\u003c\/p\u003e\n\u003cp\u003eEach bearing is constructed entirely from zirconia (ZrO2) ceramic — balls, inner race, and outer race — with no metallic components. Available in five standard miniature sizes: 604 (ID 4mm × OD 12mm × THK 4mm \/ 0.16\" × 0.47\" × 0.16\"), 605 (5×14×5mm \/ 0.20\"×0.55\"×0.20\"), 606 (6×17×6mm \/ 0.24\"×0.67\"×0.24\"), 607 (7×19×6mm \/ 0.28\"×0.75\"×0.24\"), 608 (8×22×7mm \/ 0.31\"×0.87\"×0.28\"), and 609 (9×24×7mm \/ 0.35\"×0.94\"×0.28\"). Order from 1 piece up to 50 pieces per model.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include RC car and drone wheel axles requiring non-magnetic bearings, food processing equipment where corrosion resistance is mandatory, medical and laboratory instruments sensitive to metal contamination, and precision DIY spindles or fidget mechanisms where low rolling resistance and long service life matter.\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 Direct drop-in replacement for standard 604–609 series deep groove ball bearing seats. Verify bore (ID), outer diameter (OD), and width (THK) against your housing before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These ZrO2 Full Ceramic Deep Groove 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% Zirconia Ceramic Construction\u003c\/strong\u003e — Balls, inner race, and outer race are all ZrO2 ceramic. No metallic components means zero galvanic corrosion and full chemical resistance to most acids, alkalis, and saltwater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚫\u003c\/span\u003e\u003cstrong\u003eNon-Magnetic \u0026amp; Electrically Non-Conductive\u003c\/strong\u003e — Safe for use near MRI equipment, sensitive sensors, and high-frequency electronics where steel bearings would cause interference or eddy-current losses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e\u003cstrong\u003eWide Operating Temperature Range\u003c\/strong\u003e — ZrO2 ceramic retains dimensional stability from cryogenic conditions up to approximately 400 °C (752 °F), outperforming standard chrome steel in thermal extremes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eLightweight Compared to Steel\u003c\/strong\u003e — Ceramic is roughly 40% lighter than steel by volume, reducing rotational inertia for faster spin-up in RC, robotics, and high-speed spindle applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\u003cstrong\u003eLow Friction, Low Noise Operation\u003c\/strong\u003e — The smooth ZrO2 ball surface and open (unshielded) design allow free-running rotation with minimal drag — ideal for precision instruments and fidget mechanisms.\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, 3, 5, 10, 20, 30, or 50-piece packs per model size, so you can prototype with a single bearing or stock up for production runs without overpaying.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — ZrO2 Ceramic Deep Groove Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eZirconia (ZrO2) — full ceramic (balls, inner race, outer race)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDeep Groove Ball Bearing (open \/ unshielded)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Models\u003c\/th\u003e\n\u003ctd\u003e604, 605, 606, 607, 608, 609\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 7 mm \/ 8 mm \/ 9 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e12 mm \/ 14 mm \/ 17 mm \/ 19 mm \/ 22 mm \/ 24 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness (THK)\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 6 mm \/ 7 mm \/ 7 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 10 \/ 20 \/ 30 \/ 50 Pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eApproximately −50 °C to +400 °C (−58 °F to +752 °F)\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\u003eElectrical Conductivity\u003c\/th\u003e\n\u003ctd\u003eNon-conductive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eResistant to most acids, alkalis, and saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eDry \/ unlubricated (suitable for dry or self-lubricating applications)\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 right bearing size (604, 605, 606, 607, 608, or 609)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the model number to your shaft diameter (inner diameter) and housing bore (outer diameter). The 604 fits a 4 mm shaft, 605 a 5 mm shaft, 606 a 6 mm shaft, 607 a 7 mm shaft, 608 an 8 mm shaft, and 609 a 9 mm shaft. Always verify the outer diameter and thickness against your housing before ordering — dimensions are listed in the Technical Specifications table above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eAre these bearings strong enough for load-bearing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZrO2 zirconia ceramic has a flexural strength of approximately 900–1200 MPa and hardness around 8–8.5 on the Mohs scale, making it significantly harder than steel. However, ceramic is more brittle under sharp impact loads compared to steel. These bearings are well-suited for radial loads in moderate-speed applications such as RC vehicles, drones, spindles, and instruments. Avoid applications with heavy shock or axial impact loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant are ZrO2 ceramic bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZirconia ceramic is chemically inert to most acids (including hydrochloric and sulfuric acid at moderate concentrations), alkalis, and saltwater. Unlike stainless steel bearings, ZrO2 bearings will not rust or corrode in wet or humid environments, making them a reliable choice for food processing, marine, and laboratory applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bearings near magnets or electronic sensors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. ZrO2 ceramic is fully non-magnetic and electrically non-conductive. These bearings produce no magnetic interference and no eddy currents, making them ideal for use near Hall-effect sensors, encoders, MRI-adjacent equipment, and high-frequency electronics where steel bearings would cause signal noise or energy loss.\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\u003eThese are open (unshielded) dry ceramic bearings and can be run without lubrication in many applications. If your application involves high speeds or elevated temperatures, a small amount of PTFE-based or ceramic-compatible dry lubricant can extend service life. Avoid petroleum-based greases in food-grade or chemical environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these a direct replacement for standard 604–609 steel bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — the 604 through 609 model numbers follow the same ISO dimensional standard as steel deep groove ball bearings. As long as the ID, OD, and thickness match your existing housing, these ceramic bearings are a drop-in replacement. Note that these are open bearings (no shields or seals), so confirm your application does not require a shielded (ZZ) or sealed (2RS) variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich quantity pack should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor prototyping or single-unit repairs, the 1-piece or 3-piece pack is the most cost-effective starting point. If you are building a batch of RC cars, drones, or instruments, the 10- or 20-piece packs offer a lower per-unit cost. For production runs or workshop stock, the 30- or 50-piece packs provide the best value per bearing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model (ID×OD×THK) and Packing Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"604 4*12*4mm \/ 1 Pcs","offer_id":52410688405778,"sku":"GLFBBYWGLBZSJ057057x1","price":28.33,"currency_code":"USD","in_stock":true},{"title":"604 4*12*4mm \/ 3 Pcs","offer_id":52410688438546,"sku":"GLFBBYWGLBZSJ057057x3","price":79.33,"currency_code":"USD","in_stock":true},{"title":"604 4*12*4mm \/ 5 Pcs","offer_id":52410688471314,"sku":"GLFBBYWGLBZSJ057057x5","price":131.31,"currency_code":"USD","in_stock":true},{"title":"604 4*12*4mm \/ 10 Pcs","offer_id":52410688504082,"sku":"GLFBBYWGLBZSJ057057x10","price":261.34,"currency_code":"USD","in_stock":true},{"title":"604 4*12*4mm \/ 20 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