{"product_id":"si3n4-silicon-nitride-full-ceramic-ball-bearings-6mm-50mm","title":"Si3N4 Silicon Nitride Roller Bearing Full Ball Ceramic Bearings Bore 6mm-50mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSi3N4 Silicon Nitride Ceramic Ball Bearings — Full Ceramic Precision for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel bearings corrode, seize, or fail under electrical interference, engineers and DIY builders turn to Si3N4 silicon nitride ceramic ball bearings for a reliable, long-service alternative. These full-ball ceramic bearings are suited for robotics builders, RC hobbyists, lab equipment technicians, and industrial maintenance professionals who need a bearing that performs where steel cannot.\u003c\/p\u003e\n\u003cp\u003eEach bearing is constructed entirely from silicon nitride (Si3N4) rolling elements and races, with bore diameters ranging from 5 mm to 40 mm (approx. 0.20\"–1.57\") and outer diameters from 16 mm to 68 mm (approx. 0.63\"–2.68\"). Thickness spans 5 mm to 16 mm (approx. 0.20\"–0.63\"). Available models include the 606, 608, 625, 688, 6000–6008, 6200–6206, 6800–6806, and 6900–6906 series — each listed with exact ID×OD×Thick dimensions in the variant selector.\u003c\/p\u003e\n\u003cp\u003eSi3N4 silicon nitride ceramic ball bearings are widely used in high-speed spindles, chemical processing pumps, semiconductor handling equipment, saltwater marine applications, and medical devices where non-magnetic, electrically insulating, and corrosion-free operation is required. Their low density also reduces centrifugal load at elevated RPM, making them a practical choice for high-frequency rotation in precision 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 Note:\u003c\/strong\u003e These bearings follow standard metric dimensional series (ISO 15). Verify your bore, outer diameter, and width against the variant label (ID×OD×Thick) before ordering. Fits housings and shafts designed for 606, 608, 625, 688, 6000–6008, 6200–6206, 6800–6806, and 6900–6906 metric bearing seats.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Si3N4 Silicon Nitride Ceramic Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🧪\u003c\/div\u003e\n\u003cstrong\u003eFull Si3N4 Ceramic Construction\u003c\/strong\u003e\n\u003cp\u003eBoth rolling elements and races are silicon nitride — no steel components. This eliminates galvanic corrosion and makes the bearing fully non-metallic for use in chemically aggressive or electrically sensitive environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eElectrically Non-Conductive\u003c\/strong\u003e\n\u003cp\u003eSi3N4 is an electrical insulator, preventing current leakage through the bearing. Critical for variable-frequency drive (VFD) motors, MRI-adjacent equipment, and any application where stray current causes pitting damage in steel bearings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🌊\u003c\/div\u003e\n\u003cstrong\u003eCorrosion-Free in Wet \u0026amp; Chemical Environments\u003c\/strong\u003e\n\u003cp\u003eUnlike steel or hybrid bearings, full ceramic bearings resist acids, alkalis, and saltwater without surface degradation. Suitable for marine, food processing, and chemical pump applications where moisture ingress is unavoidable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏎️\u003c\/div\u003e\n\u003cstrong\u003eLow Density for High-Speed Operation\u003c\/strong\u003e\n\u003cp\u003eSilicon nitride is approximately 60% lighter than bearing steel. The reduced mass of rolling elements lowers centrifugal force at high RPM, enabling higher speed ratings and reduced heat generation in spindle and turbine applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🌡️\u003c\/div\u003e\n\u003cstrong\u003eBroad Operating Temperature Range\u003c\/strong\u003e\n\u003cp\u003eSi3N4 ceramic maintains dimensional stability from cryogenic conditions up to approximately 800 °C (1472 °F) in dry environments, outperforming standard steel bearings in both extreme cold and elevated-temperature service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Model Range — 6mm to 50mm Bore\u003c\/strong\u003e\n\u003cp\u003eCovers 32 standard metric models across the 600, 6000, 6200, 6800, and 6900 series. Each variant is labeled with exact ID×OD×Thick dimensions so you can match your housing specification without guesswork.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Si3N4 Ceramic Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSilicon Nitride (Si3N4) — full ceramic (races and rolling elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDeep groove ball bearing, full ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e5 mm – 40 mm (approx. 0.20\" – 1.57\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e16 mm – 68 mm (approx. 0.63\" – 2.68\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth (Thickness)\u003c\/th\u003e\n\u003ctd\u003e5 mm – 16 mm (approx. 0.20\" – 0.63\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Series\u003c\/th\u003e\n\u003ctd\u003e606, 608, 625, 688 \/ 6000–6008 \/ 6200–6206 \/ 6800–6806 \/ 6900–6906\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensional Standard\u003c\/th\u003e\n\u003ctd\u003eISO 15 metric series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eSee variant options (dry \/ lubrication-free operation supported)\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\u003eUp to approx. 800 °C (1472 °F) in dry conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrical Properties\u003c\/th\u003e\n\u003ctd\u003eNon-conductive (insulating)\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\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eResistant to acids, alkalis, and saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003eSee variant options (1 pcs available; bulk options may apply)\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 select the correct bearing model for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the three key dimensions: bore diameter (ID), outer diameter (OD), and width (thickness). These are listed in the variant label as ID×OD×Thick in millimeters. For example, \"6004 – 20×42×12mm\" means a 20 mm bore, 42 mm OD, and 12 mm width. Measure your shaft diameter for the ID and your housing bore for the OD before selecting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these full ceramic bearings or hybrid ceramic bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are full ceramic bearings — both the rolling balls and the inner\/outer races are made from Si3N4 silicon nitride. Hybrid ceramic bearings use ceramic balls with steel races. Full ceramic construction provides complete corrosion immunity and electrical insulation that hybrid designs cannot match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo Si3N4 ceramic bearings require lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride has inherently low friction and can operate dry in many applications, which is one of its key advantages over steel. However, in high-load or high-speed applications, a compatible lubricant (such as PTFE-based grease) can extend service life. Avoid petroleum-based greases in chemically aggressive environments. Contact us to confirm lubrication recommendations for your specific use case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these bearings be used in saltwater or corrosive chemical environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Si3N4 silicon nitride is chemically inert to most acids, alkalis, and saltwater. Full ceramic bearings are a standard choice for marine propulsion systems, desalination equipment, chemical dosing pumps, and food-grade machinery where steel would corrode rapidly. No additional coating or sealing is required for corrosion resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings compatible with standard metric bearing housings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. All models follow ISO 15 standard metric dimensions, so they are drop-in replacements for steel bearings of the same series number. A 6004 ceramic bearing has identical outer dimensions to a 6004 steel bearing and will fit the same housing and shaft without modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum speed and temperature rating for these bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSi3N4 ceramic bearings typically support higher speed ratings than equivalent steel bearings due to their lower density and reduced centrifugal load. Maximum operating temperature in dry conditions reaches approximately 800 °C (1472 °F). Exact speed limits depend on bearing size, load, and lubrication — contact us to confirm for your specific model and operating conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy would I choose a full ceramic bearing over a hybrid ceramic bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFull ceramic bearings are the right choice when you need complete electrical insulation (no conductive path through the bearing), total corrosion immunity (including the races), or operation in environments where any metallic component would be problematic — such as MRI rooms, strong magnetic fields, or highly acidic media. Hybrid bearings offer a cost compromise but retain steel races that can corrode or conduct electricity.\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×Thick) and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"606- 6*17*6mm \/ 1 pcs","offer_id":52409904202002,"sku":"GLFBDMHGLBZSJ056946x1","price":55.8,"currency_code":"USD","in_stock":true},{"title":"608- 8*22*7mm \/ 1 pcs","offer_id":52409904234770,"sku":"GLFBDMHGLBZSJ056947x1","price":55.8,"currency_code":"USD","in_stock":true},{"title":"625- 5*16*5mm \/ 1 pcs","offer_id":52409904267538,"sku":"GLFBDMHGLBZSJ056948x1","price":55.8,"currency_code":"USD","in_stock":true},{"title":"688- 8*16*5mm \/ 1 pcs","offer_id":52409904300306,"sku":"GLFBDMHGLBZSJ056949x1","price":55.8,"currency_code":"USD","in_stock":true},{"title":"6000- 10*26*8mm \/ 1 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