{"product_id":"420-stainless-steel-ball-bearings-replacement","title":"Precision 420 Stainless Steel Ball Bearing Replacement Bearings 0.4mm to 1mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e420 Stainless Steel Ball Bearings — Precision Replacement Bearings for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized bearing causes wobble, noise, or premature failure in a precision assembly, finding the exact replacement diameter matters. These 420 stainless steel ball bearings are stocked in 22 diameters from 0.4 mm to 7 mm, giving DIYers, machinists, and repair technicians a reliable source for hard-to-find sizes without ordering custom parts.\u003c\/p\u003e\n\u003cp\u003eEach bearing is a solid 420 stainless steel ball, precision-ground to tight spherical tolerances. Diameters span 0.4 mm (≈ 0.016 in) through 7 mm (≈ 0.276 in), covering both metric and fractional inch sizes such as 1\/16 in (1.5875 mm), 3\/32 in (2.381 mm), 7\/64 in (2.778 mm), 3\/16 in (4.763 mm), 7\/32 in (5.556 mm), and 15\/64 in (5.953 mm). Packs are available in 100-piece or 500-piece quantities to suit single-repair or bulk-stocking needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing worn balls in miniature radial bearings for RC vehicles and drones, restoring smooth action in valve seats and check valves, serving as load-distributing elements in jigs and fixtures, and acting as detent balls in tool holders and locking mechanisms. The corrosion resistance of 420 stainless makes these 420 stainless steel ball bearings suitable for moist workshop environments and light washdown conditions.\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 Sized to standard metric and fractional-inch bearing dimensions. Verify your required diameter and grade before ordering. Contact us to confirm fit for critical or load-bearing assemblies.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 420 Stainless Steel Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e420 Stainless Steel Construction\u003c\/strong\u003e — Martensitic stainless alloy provides a balance of hardness and corrosion resistance, outperforming carbon steel in humid or lightly corrosive environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003e22 Diameter Options (0.4 mm – 7 mm)\u003c\/strong\u003e — Covers both metric and fractional inch sizes in a single product listing, reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003ePrecision-Ground Spherical Surface\u003c\/strong\u003e — Tight roundness tolerances support smooth rolling and consistent load distribution in miniature bearing races and valve seats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Finish\u003c\/strong\u003e — 420 stainless resists rust and surface oxidation in workshop humidity, light mist, and non-aggressive fluid contact better than standard steel balls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003e100-Piece or 500-Piece Packs\u003c\/strong\u003e — Choose the quantity that matches your project scale; 100-piece packs suit single repairs, while 500-piece packs reduce per-unit cost for production or stocking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e — Suitable for miniature radial bearings, check valves, detent mechanisms, jigs, fixtures, and RC or drone drivetrain rebuilds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 420 Stainless Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e420 Stainless Steel (martensitic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e0.4 mm – 7 mm (≈ 0.016 in – 0.276 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e0.4, 0.5, 0.6, 0.7, 0.8, 1, 1.5875, 2, 2.381, 2.5, 2.778, 3, 3.5, 3.969, 4, 4.763, 5, 5.556, 5.953, 6, 6.35, 7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e100 pcs or 500 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003ePrecision-ground, bright\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade \/ Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate — suitable for humid and lightly corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnetism\u003c\/th\u003e\n\u003ctd\u003eSlightly magnetic (martensitic stainless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eMiniature bearings, valve seats, detent balls, jigs, RC\/drone drivetrains\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Pack\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 replacement?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the worn or missing ball with a micrometer or digital caliper. Match the measured diameter to the closest available size in this listing. For bearing races, the ball diameter must match the original specification — even a 0.1 mm difference can cause excessive play or binding. If you have the original bearing part number, cross-reference it to confirm the ball diameter before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 420 stainless steel strong enough for load-bearing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e420 stainless steel is a martensitic alloy that can be hardened to a useful level for many bearing applications. It is commonly used in valve balls, instrument bearings, and light-duty radial bearings. For heavy-load or high-speed precision bearings, grades such as 440C stainless or chrome steel (52100) offer higher hardness. Contact us to confirm suitability if your application involves significant radial or axial loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these balls rust in a wet or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e420 stainless steel provides moderate corrosion resistance — significantly better than carbon steel, but less than 316 stainless. These balls are suitable for humid workshop conditions, light mist, and incidental water contact. For continuous immersion in water, salt spray, or chemical exposure, consider 316 stainless or ceramic balls instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard bearing races and housings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe diameters listed correspond to common metric and fractional-inch ball sizes used in standard miniature bearing races. However, bearing manufacturers specify ball grade (G10, G25, etc.) in addition to diameter. If your application requires a specific grade tolerance, contact us to confirm before ordering, as grade affects roundness and surface finish precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 100-piece and 500-piece packs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth packs contain the same 420 stainless steel balls at the same diameter. The 500-piece pack offers a lower per-unit cost and is suited for production runs, bulk stocking, or workshops that regularly replace bearing balls. The 100-piece pack is a practical choice for single repairs or low-volume use where storing large quantities is not necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in food-contact or medical equipment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e420 stainless steel is not typically certified for food-contact or medical-grade applications. For those environments, 316L stainless or certified medical-grade materials are the appropriate choice. If you are unsure whether these balls meet your regulatory requirements, consult the relevant standards (e.g., FDA, ISO 10993) and contact us to confirm material documentation availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select between metric and fractional-inch sizes?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSeveral diameters in this listing correspond to fractional-inch standards: 1.5875 mm = 1\/16 in, 2.381 mm = 3\/32 in, 2.778 mm = 7\/64 in, 3.969 mm = 5\/32 in, 4.763 mm = 3\/16 in, 5.556 mm = 7\/32 in, 5.953 mm = 15\/64 in, and 6.35 mm = 1\/4 in. If your equipment was designed to inch standards, match the fractional equivalent rather than rounding to the nearest metric size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Material, 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":"420 Stainless Steel \/ 0.4mm \/ 100pcs","offer_id":52409656508690,"sku":"LFL2024GANGZHU2028x100","price":4.23,"currency_code":"USD","in_stock":true},{"title":"420 Stainless Steel \/ 0.5mm \/ 100pcs","offer_id":52409656541458,"sku":"LFL2024GANGZHU2029x100","price":4.23,"currency_code":"USD","in_stock":true},{"title":"420 Stainless Steel \/ 0.6mm \/ 100pcs","offer_id":52409656574226,"sku":"LFL2024GANGZHU2030x100","price":4.23,"currency_code":"USD","in_stock":true},{"title":"420 Stainless Steel \/ 0.7mm \/ 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500pcs","offer_id":52409657917714,"sku":"LFL2024GANGZHU2049x500","price":56.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of6_c8bbaefc-b76e-41e9-bc22-cc51d2f315a6.jpg?v=1782140732","url":"https:\/\/homediyer.com\/products\/420-stainless-steel-ball-bearings-replacement","provider":"HomeDIYer","version":"1.0","type":"link"}