{"product_id":"silicon-nitride-full-ceramic-ball-bearing-6900-6800-6200-6000-series","title":"Silicon Nitride Full Ceramic Ball Bearing Full Balls Bearings 6900 6901 6902 606","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSilicon Nitride Full Ceramic Ball Bearings — Corrosion-Resistant Precision for Demanding Environments\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel bearings corrode, seize, or fail under electrical interference, engineers and DIY builders turn to silicon nitride full ceramic ball bearings. These bearings are designed for applications where moisture, chemicals, high temperatures, or electromagnetic fields make metallic components impractical — from marine hardware and chemical processing equipment to high-frequency spindles and medical devices.\u003c\/p\u003e\n\u003cp\u003eEach bearing in this listing is a full complement design, meaning the entire rolling element set consists of Si₃N₄ (silicon nitride) ceramic balls with a ceramic inner and outer race — no steel components in the load path. Available sizes span inner diameters from 5 mm (0.20 in) to 50 mm (1.97 in) and outer diameters from 16 mm (0.63 in) to 80 mm (3.15 in), covering the 6900, 6800, 606, 608, 625, 688, 6200, and 6000 series.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include saltwater-exposed fishing reels and boat hardware, semiconductor fab equipment requiring non-contaminating bearings, high-speed dental or lab spindles, and RC vehicle wheel hubs where weight reduction and corrosion resistance matter. The full ceramic construction also suits applications requiring electrical insulation, such as motor test rigs and MRI-adjacent machinery.\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 These bearings follow standard metric bore\/OD\/width dimensions (e.g., 6900 = 10×22×6 mm). They are drop-in replacements for same-series steel or hybrid ceramic bearings sharing identical envelope dimensions. Verify your bore, OD, and width before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Silicon Nitride Full Ceramic Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧪\u003c\/span\u003e \u003cstrong\u003eFull Si₃N₄ Ceramic Construction\u003c\/strong\u003e\n\u003cp\u003eBoth races and all rolling elements are silicon nitride ceramic — no steel in the load path. This eliminates galvanic corrosion and makes the bearing fully non-magnetic and electrically non-conductive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e \u003cstrong\u003eCorrosion and Chemical Resistance\u003c\/strong\u003e\n\u003cp\u003eSi₃N₄ withstands exposure to saltwater, acids, alkalis, and most industrial solvents that would rapidly degrade carbon steel or even stainless steel bearings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e \u003cstrong\u003eExtended Temperature Range\u003c\/strong\u003e\n\u003cp\u003eSilicon nitride retains structural integrity at temperatures typically up to 800 °C (1472 °F) in dry conditions, far exceeding the limits of standard bearing steel, making these suitable for oven conveyor systems and high-heat spindles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eElectrical Insulation\u003c\/strong\u003e\n\u003cp\u003eFull ceramic construction provides high electrical resistivity, preventing current passage through the bearing — critical for electric motor test benches, welding equipment, and MRI-adjacent applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏎️\u003c\/span\u003e \u003cstrong\u003eLow Density for Reduced Centrifugal Load\u003c\/strong\u003e\n\u003cp\u003eSi₃N₄ is approximately 60% lighter than bearing steel by density. At high RPM, lighter rolling elements generate lower centrifugal forces, reducing race wear and enabling higher speed ratings compared to all-steel equivalents.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Size Range — 33 Variants Across 8 Series\u003c\/strong\u003e\n\u003cp\u003eCovers 6900, 6800, 606, 608, 625, 688, 6200, and 6000 series with bore sizes from 5 mm to 50 mm (0.20–1.97 in). Select your exact series and dimension from the variant options above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Silicon Nitride Full Ceramic Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial — Races\u003c\/th\u003e\n\u003ctd\u003eSilicon Nitride (Si₃N₄) Ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial — Rolling Elements\u003c\/th\u003e\n\u003ctd\u003eSilicon Nitride (Si₃N₄) Ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eFull Complement Deep Groove Ball Bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries Available\u003c\/th\u003e\n\u003ctd\u003e6900, 6800, 606, 608, 625, 688, 6200, 6000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (ID) Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 50 mm (0.20 in – 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD) Range\u003c\/th\u003e\n\u003ctd\u003e16 mm – 80 mm (0.63 in – 3.15 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 20 mm (0.20 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeal \/ Shield Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Operating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically up to 800 °C (dry, unlubricated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrical Resistivity\u003c\/th\u003e\n\u003ctd\u003eNon-conductive (full 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\u003eDimensional Standard\u003c\/th\u003e\n\u003ctd\u003eISO 15 \/ JIS B 1512 metric series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs per unit (see variant options for bulk)\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 for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bore (inner diameter), outer diameter, and width to your housing and shaft dimensions. The variant name format is: Series \/ ID×OD×Width mm — for example, \"6902 \/ 15×28×7mm\" means a 6902-series bearing with a 15 mm bore, 28 mm OD, and 7 mm width. Measure your existing bearing or shaft seat before selecting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings strong enough to replace steel bearings in load-bearing assemblies?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride has a hardness of approximately 1,500 HV and a compressive strength exceeding 3,000 MPa, making it harder than most bearing steels. However, ceramic is more brittle under impact or shock loads compared to steel. These bearings are well-suited for steady radial and axial loads but should be evaluated carefully for applications with frequent shock or vibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bearings resist saltwater and marine environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Si₃N₄ ceramic is chemically inert to saltwater, making these bearings a reliable choice for fishing reels, boat hardware, underwater ROVs, and other marine applications where steel bearings would corrode rapidly. No additional corrosion-inhibiting coating is required on the ceramic surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard bearing housings designed for steel bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the series and dimensions match. These bearings follow standard ISO metric envelope dimensions (bore, OD, width), so a 6902 ceramic bearing will fit any housing designed for a standard 6902 steel bearing with the same 15×28×7 mm dimensions. Always verify all three dimensions before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bearings in electrical or MRI environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFull ceramic bearings are electrically non-conductive and non-magnetic, making them suitable for use near MRI equipment, in electric motor test rigs, and in semiconductor fabrication tools where metallic contamination or current leakage through the bearing must be avoided. Confirm your specific insulation requirements with your equipment manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication do these bearings require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFull ceramic bearings can operate with minimal lubrication or dry in certain high-temperature or clean-room environments where lubricants would degrade or contaminate the process. For general use, a ceramic-compatible grease (PTFE-based or perfluoropolyether) is recommended. Avoid petroleum-based greases at elevated temperatures as they may carbonize. Contact us to confirm lubrication recommendations for your specific operating conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 6900, 6800, 6200, and 6000 series?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese designations refer to different dimensional series with varying OD-to-bore ratios. The 6900 series has a narrower cross-section (lighter, more compact), the 6200 series has a wider cross-section (higher load capacity for the same bore), and the 6000 and 6800 series fall in between. Choose based on your space constraints and load requirements. The 606, 608, 625, and 688 are specific miniature sizes outside the standard numbered series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Size 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":"6900 \/ 10*22*6mm \/ 1 pcs","offer_id":52410218545426,"sku":"QMGLBZSJ056932x1","price":29.77,"currency_code":"USD","in_stock":true},{"title":"6901 \/ 12*24*6mm \/ 1 pcs","offer_id":52410218578194,"sku":"QMGLBZSJ056933x1","price":32.3,"currency_code":"USD","in_stock":true},{"title":"6902 \/ 15*28*7mm \/ 1 pcs","offer_id":52410218610962,"sku":"QMGLBZSJ056934x1","price":34.75,"currency_code":"USD","in_stock":true},{"title":"6903 \/ 17*30*7mm \/ 1 pcs","offer_id":52410218643730,"sku":"QMGLBZSJ056935x1","price":39.64,"currency_code":"USD","in_stock":true},{"title":"6904 \/ 20*37*9mm \/ 1 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