{"product_id":"silicon-nitride-ceramic-ball-bearings-g5-precision","title":"1mm-25.4mm 1\/4\" 5\/16\" Ball Bearings Silicon Nitride Ceramic Balls G5 Precision","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSilicon Nitride Ceramic Ball Bearings G5 Precision — Built for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel balls fail under heat, corrosion, or electrical conductivity requirements, engineers and precision machinists turn to silicon nitride ceramic balls. Whether you are rebuilding high-speed spindle bearings, assembling robotics joints, or sourcing replacement balls for aerospace-grade assemblies, these G5 precision silicon nitride ceramic balls deliver the dimensional accuracy and material performance your application demands.\u003c\/p\u003e\n\u003cp\u003eEach ball is manufactured from hot-pressed silicon nitride (Si₃N₄) ceramic, offering a density of approximately 3.2 g\/cm³ — roughly 60% lighter than chrome steel. Diameter options span 1mm through 25.4mm (1\/16\" through 1\"), covering both metric and imperial fractional sizes including 1\/4\" (6.35mm), 5\/16\" (7.938mm), 3\/8\" (9.525mm), 1\/2\" (12.7mm), and 5\/8\" (15.875mm). Packaging quantities range from 1 PCS to 100 PCS to suit prototyping through production runs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include high-speed angular contact bearings for CNC spindles, hybrid ceramic bearing upgrades for electric motors and turbines, corrosion-resistant ball valves in chemical processing, and electrically insulating rolling elements in MRI and semiconductor equipment. Long-tail applications also include precision ball screws, flow meters, and dental handpiece bearings.\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 Suitable for standard radial, angular contact, and thrust bearing housings. Verify bore diameter and ball complement count against your bearing specification before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Silicon Nitride 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\u003eG5 Grade Precision\u003c\/strong\u003e\n\u003cp\u003eManufactured to ABEC\/ISO Grade 5 tolerances with diameter deviation typically within ±0.13 µm, ensuring consistent roundness and surface finish for low-vibration, low-noise operation in precision assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e \u003cstrong\u003eHigh-Temperature Stability\u003c\/strong\u003e\n\u003cp\u003eSilicon nitride retains mechanical strength up to approximately 1000 °C (1832 °F), making these balls suitable for high-speed spindles, turbine bearings, and other thermally demanding environments where steel balls would soften or deform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion \u0026amp; Chemical Resistance\u003c\/strong\u003e\n\u003cp\u003eSi₃N₄ ceramic is inert to most acids, alkalis, and saltwater environments. These balls will not rust or corrode, eliminating the need for lubrication in many wet or chemically aggressive applications.\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\u003eWith a volume resistivity exceeding 10¹² Ω·cm, silicon nitride ceramic balls prevent electrical current passage through bearing assemblies — critical for electric motors, generators, and semiconductor processing equipment to avoid fluting damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eLightweight — ~60% Lighter Than Steel\u003c\/strong\u003e\n\u003cp\u003eAt approximately 3.2 g\/cm³ density, ceramic balls reduce centrifugal loading on bearing races at high RPM, enabling faster acceleration, lower operating temperatures, and extended bearing service life compared to all-steel configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Diameter Range — Metric \u0026amp; Imperial\u003c\/strong\u003e\n\u003cp\u003eAvailable from 1mm to 25.4mm (1\") in 42 diameter steps covering both metric and fractional inch sizes. Bulk packs of 10, 50, or 100 PCS available for smaller diameters; 1 PCS and 5 PCS options for larger sizes from 8mm upward.\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 Ceramic Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHot-pressed Silicon Nitride (Si₃N₄)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eG5 (ISO 3290 \/ ABEC Grade 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e1mm – 25.4mm (1\/16\" – 1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDensity\u003c\/th\u003e\n\u003ctd\u003e~3.2 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003e~1500 HV (Vickers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Operating Temperature\u003c\/th\u003e\n\u003ctd\u003e~1000 °C (1832 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrical Resistivity\u003c\/th\u003e\n\u003ctd\u003e\u0026gt;10¹² Ω·cm (electrically insulating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Roughness (Ra)\u003c\/th\u003e\n\u003ctd\u003eTypically ≤0.01 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Ball\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackaging Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 50 \/ 100 PCS (varies by diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003ePolished ceramic surface\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\u003eLubrication Requirement\u003c\/th\u003e\n\u003ctd\u003eReduced or none in many 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 correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCheck your bearing's datasheet or measure the existing balls with a micrometer. The ball diameter must match the bearing's ball complement specification exactly. For imperial bearings, use the fractional inch sizes listed (e.g., 1\/4\" = 6.35mm, 5\/16\" = 7.938mm). For metric bearings, select the corresponding metric diameter. If in doubt, contact us with your bearing part number and we can advise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G5 precision grade mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG5 is a ball grade defined by ISO 3290, indicating that the diameter variation across any single ball is within 0.13 µm and the lot diameter variation is within 0.25 µm. This level of precision minimizes vibration, noise, and heat generation in high-speed assemblies. G5 is the standard grade for precision spindle bearings, instrument bearings, and other applications where dimensional consistency is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre silicon nitride ceramic balls stronger than steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride has a Vickers hardness of approximately 1500 HV, compared to ~700 HV for hardened chrome steel (52100). This makes ceramic balls significantly harder and more wear-resistant. However, ceramics are brittle under impact loads, so they are best suited for rolling contact applications rather than environments with heavy shock loading. For most bearing applications — especially high-speed and high-temperature — silicon nitride outperforms steel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these balls require lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride ceramic balls have lower friction coefficients than steel and can operate with reduced lubrication in many applications. In clean, dry, or chemically aggressive environments, they can often run without conventional grease or oil. However, in high-load or high-speed bearing assemblies, light lubrication is still recommended to protect the bearing races (which are typically steel) from wear. Always follow your bearing manufacturer's lubrication guidelines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls compatible with stainless steel or chrome steel bearing races?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Silicon nitride ceramic balls are widely used in hybrid bearings, where ceramic balls run in standard steel inner and outer races. This hybrid configuration is common in CNC spindles, electric motors, and bicycle hubs. The ceramic balls reduce heat generation and extend race life compared to all-steel configurations. Ensure the ball diameter matches the race groove radius for optimal contact geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich diameter and quantity should I order for a prototype vs. production run?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor prototyping or single-bearing replacement, the 1 PCS or 5 PCS options (available for diameters 8mm and above) allow you to test fit and performance before committing to larger quantities. For production runs or stocking multiple bearings, the 10 PCS, 50 PCS, or 100 PCS packs offer better per-unit value. Smaller diameters (1mm–7.938mm) are available in 10, 50, or 100 PCS packs suited to higher-volume assembly work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these balls be used in food-grade or medical applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride is chemically inert and does not corrode or leach contaminants, making it a candidate for food processing and medical device applications. However, regulatory compliance (e.g., FDA, EU food contact standards, ISO 13485 for medical devices) depends on the full assembly design and certification requirements of your application. Please consult your compliance team and contact us if you need material certification documentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your diameter and packaging quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1mm \/ 10 PCS","offer_id":52410684277010,"sku":"AATYHGLBZSJ056739x10","price":2.71,"currency_code":"USD","in_stock":true},{"title":"1mm \/ 50 PCS","offer_id":52410684309778,"sku":"AATYHGLBZSJ056739x50","price":6.54,"currency_code":"USD","in_stock":true},{"title":"1mm \/ 100 PCS","offer_id":52410684342546,"sku":"AATYHGLBZSJ056739x100","price":11.34,"currency_code":"USD","in_stock":true},{"title":"1.2mm \/ 10 PCS","offer_id":52410684375314,"sku":"AATYHGLBZSJ056740x10","price":2.57,"currency_code":"USD","in_stock":true},{"title":"1.2mm \/ 50 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