{"product_id":"si3n4-silicon-nitride-ceramic-ball-bearings-g5","title":"Si3N4 Silicon Nitride Ceramic Ball Bearings G5 Dia 1mm-40mm Solid Round Balls","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSi3N4 Silicon Nitride Ceramic Ball Bearings G5 — Precision-Grade Solid Round Balls for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen standard steel balls corrode, magnetize, or add unwanted weight to your build, makers and engineers reach for silicon nitride ceramic. Whether you are rebuilding a spindle, upgrading a pump, or prototyping a precision mechanism, these G5-grade Si3N4 balls deliver the dimensional accuracy and material resilience that steel simply cannot match.\u003c\/p\u003e\n\u003cp\u003eEach ball is manufactured from silicon nitride (Si3N4) ceramic, offering a density of approximately 3.2 g\/cm³ — roughly 60% lighter than bearing steel. The diameter range spans 1 mm to 38.1 mm (approx. 0.039 in to 1.500 in), covering both miniature instrument bearings and larger industrial-grade applications. Grade G5 specifies a sphericity tolerance of ≤0.13 µm and surface roughness Ra ≤0.02 µm, ensuring smooth, low-friction rolling contact.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include high-speed spindle bearings for CNC routers and dental drills, corrosion-resistant valve seats in chemical or marine environments, and non-magnetic precision balls for MRI-adjacent equipment or sensitive electronic assemblies. Long-tail applications also include replacement balls for skateboard bearings, fishing reel upgrades, and DIY linear motion systems.\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 Fits standard open, shielded, and sealed bearing races sized to match the selected diameter. Verify your bearing bore and retainer clearance before ordering. Suitable for dry-running, oil-lubricated, and grease-lubricated environments.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Si3N4 Silicon Nitride Ceramic Balls\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eG5 Precision Grade\u003c\/strong\u003e — Sphericity ≤0.13 µm and surface roughness Ra ≤0.02 µm for consistent, low-vibration rolling performance in precision instruments and high-speed spindles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚗️\u003c\/span\u003e\u003cstrong\u003eCorrosion \u0026amp; Chemical Resistance\u003c\/strong\u003e — Si3N4 ceramic withstands acids, alkalis, and saltwater environments where steel balls would pit or rust, extending service life in harsh conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧲\u003c\/span\u003e\u003cstrong\u003eNon-Magnetic \u0026amp; Electrically Insulating\u003c\/strong\u003e — Zero magnetic permeability and high electrical resistivity make these balls safe for use near sensitive electronics, MRI equipment, and high-voltage assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eHigh-Temperature Stability\u003c\/strong\u003e — Retains mechanical strength up to approximately 1000 °C (1832 °F), suitable for applications involving elevated operating temperatures where polymer or standard steel components would fail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e — Available from 1 mm to 38.1 mm in metric and inch-fractional sizes, covering miniature instrument bearings through larger industrial replacements in a single product line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Choose 1 PCS, 5 PCS, or 10 PCS packing to match your project scale, from single-unit prototyping to small-batch production runs.\u003c\/li\u003e\n\u003c\/ul\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) Ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eG5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e1 mm – 38.1 mm (0.039 in – 1.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSphericity Tolerance\u003c\/th\u003e\n\u003ctd\u003e≤ 0.13 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Roughness (Ra)\u003c\/th\u003e\n\u003ctd\u003e≤ 0.02 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDensity\u003c\/th\u003e\n\u003ctd\u003eApprox. 3.2 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Vickers)\u003c\/th\u003e\n\u003ctd\u003eApprox. 1500 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Operating Temperature\u003c\/th\u003e\n\u003ctd\u003eApprox. 1000 °C (1832 °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 Properties\u003c\/th\u003e\n\u003ctd\u003eElectrically insulating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003ePolished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Options\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 5 PCS \/ 10 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eGrey \/ Black (typical for Si3N4)\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 diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the inner diameter of your bearing race or the bore of the housing that will hold the ball. The ball diameter should match the race groove radius closely — typically the ball diameter equals the bore diameter of the race. If you are replacing existing balls, measure the old ball with a micrometer for the most accurate result. Refer to your bearing manufacturer's datasheet for the specified ball diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls strong enough for load-bearing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSi3N4 ceramic has a Vickers hardness of approximately 1500 HV and a flexural strength of roughly 700–900 MPa, making it suitable for moderate-to-high radial and axial loads in precision bearings. However, ceramic is more brittle than steel under impact loads. Avoid applications with heavy shock loading or sudden impact forces unless your design accounts for this characteristic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these balls rust or corrode in wet or marine environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSilicon nitride ceramic is inherently corrosion-resistant and will not rust. It withstands exposure to most acids, alkalis, and saltwater without degradation. This makes Si3N4 balls an excellent choice for marine hardware, chemical pumps, food-processing equipment, and any application where moisture or chemical exposure would corrode steel balls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in a hybrid bearing alongside steel rings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Hybrid bearings — ceramic balls running in steel inner and outer races — are a common and well-established configuration. The ceramic balls reduce friction, heat generation, and electrical conductivity between the races. Ensure the steel race material and surface finish are compatible with ceramic contact to avoid premature wear on the race grooves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat packing quantity should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect 10 PCS for small-diameter balls (1 mm – 8 mm) used in miniature bearings where multiple balls per race are needed. Choose 5 PCS for mid-range diameters (8.5 mm – 10 mm). For larger diameters (10.318 mm – 38.1 mm), 1 PCS is available, which suits single-ball valve seats or large bearing replacements. Match the quantity to the number of balls your bearing retainer requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls suitable for high-speed spindle applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. G5-grade Si3N4 ceramic balls are widely used in high-speed spindles for CNC machining centers, dental handpieces, and turbomachinery. Their low density reduces centrifugal force on the outer race at high RPM, lowering heat generation and extending bearing life compared to all-steel configurations. Ensure your lubrication method (grease or oil-air mist) is appropriate for your target speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the balls are genuine G5 grade?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG5 grade is defined by ISO 3290 and ABMA standards, specifying maximum deviation from spherical form (≤0.13 µm) and lot diameter variation. You can verify grade by measuring multiple balls with a precision roundness tester or by requesting a material certificate. If you need documentation for industrial or aerospace applications, please contact us to confirm availability of inspection reports.\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 Packing QTY 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":52410810138898,"sku":"Adaah2024GANGZHU4999x10","price":8.19,"currency_code":"USD","in_stock":true},{"title":"1.2mm \/ 10 PCS","offer_id":52410810171666,"sku":"Adaah2024GANGZHU2369x10","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1.5mm \/ 10 PCS","offer_id":52410810204434,"sku":"Adaah2024GANGZHU5000x10","price":8.34,"currency_code":"USD","in_stock":true},{"title":"1.5875mm \/ 10 PCS","offer_id":52410810237202,"sku":"Adaah2024GANGZHU2370x10","price":11.74,"currency_code":"USD","in_stock":true},{"title":"2mm \/ 10 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