{"product_id":"steel-ball-bearings-8-21mm-all-size","title":"Steel Ball Bearings 8-21mm -ALL SIZE","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSteel Ball Bearings 7.938–21.431mm — Precision Rolling Elements for Metric \u0026amp; Imperial Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized ball bearing causes play, noise, or premature failure in a bearing assembly, finding the exact replacement diameter is the real challenge. Machinists, maintenance technicians, and serious DIYers who work across both metric and imperial systems know that a 0.1mm mismatch is enough to compromise a whole assembly. These steel ball bearings are stocked in 45 discrete sizes to eliminate that guesswork.\u003c\/p\u003e\n\u003cp\u003eEach ball is manufactured from hardened carbon steel, delivering the surface hardness and dimensional consistency required for load-bearing rolling contact. Sizes span 7.938mm (5\/16 in) through 21.431mm (27\/32 in), covering the most common metric steps as well as fractional-inch equivalents such as 9.525mm (3\/8 in), 12.7mm (1\/2 in), 15.875mm (5\/8 in), 19.05mm (3\/4 in), and 19.844mm (25\/32 in). Available in packs of 10, 20, or 50 pieces to match your project volume.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing rolling elements in deep-groove ball bearings, angular contact bearings, and thrust bearing assemblies; restoring smooth action in drawer slides, caster wheels, and bicycle hubs; and serving as precision spacers or load-transfer elements in custom jigs, fixtures, and mechanical linkages where exact diameter control is critical.\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 balls are intended as replacement rolling elements. Verify the bore diameter of your bearing race or housing before ordering. Both metric and fractional-inch sizes are available — check the size chart in the variant selector.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Steel Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003e45 Discrete Sizes\u003c\/strong\u003e\n\u003cp\u003eCovers 7.938mm to 21.431mm in metric steps and fractional-inch equivalents, so you can match the exact diameter your assembly requires without compromise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eHardened Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eManufactured from hardened carbon steel for the surface hardness needed to withstand rolling contact loads, resist deformation, and maintain dimensional accuracy over service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eMetric \u0026amp; Imperial Coverage\u003c\/strong\u003e\n\u003cp\u003eIncludes both clean metric steps (8mm, 10mm, 12mm, 15mm, 20mm) and fractional-inch sizes (9.525mm = 3\/8\", 12.7mm = 1\/2\", 15.875mm = 5\/8\", 19.05mm = 3\/4\") for cross-system compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eChoose from packs of 10, 20, or 50 pieces per size. Order a small quantity for a single repair or stock up in bulk for ongoing maintenance and production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eConsistent Spherical Geometry\u003c\/strong\u003e\n\u003cp\u003eUniform spherical form ensures even load distribution across the contact zone, reducing point stress and extending the service life of the surrounding race and housing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eWide Application Range\u003c\/strong\u003e\n\u003cp\u003eSuitable for deep-groove bearings, thrust assemblies, caster wheels, bicycle hubs, drawer slides, and custom mechanical fixtures where precise rolling-element diameter is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Steel Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHardened carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e7.938mm – 21.431mm (approx. 5\/16\" – 27\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003e45 sizes (metric steps + fractional-inch equivalents)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e10 pcs \/ 20 pcs \/ 50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eWeight per Ball\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Type\u003c\/th\u003e\n\u003ctd\u003eReplacement rolling elements; precision mechanical assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Bearing Types\u003c\/th\u003e\n\u003ctd\u003eDeep-groove, angular contact, thrust bearings; casters; hubs\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 find the correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eRemove one ball from the existing bearing race and measure its diameter with a micrometer or digital caliper. Match that measurement to the closest size in the variant selector. For fractional-inch bearings, use the imperial equivalents listed in the product description (e.g., 12.7mm = 1\/2\", 15.875mm = 5\/8\"). If your measurement falls between two listed sizes, contact us to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can these steel balls handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLoad capacity depends on ball diameter, the hardness of the mating race, and the application's speed and lubrication conditions. Larger-diameter balls distribute load over a greater contact area and generally support higher radial loads. For critical load calculations, refer to the bearing manufacturer's specification sheet for your specific race and housing. These balls are intended as replacement rolling elements in standard bearing assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are manufactured from hardened carbon steel, which provides excellent hardness and load-bearing performance but has limited inherent corrosion resistance compared to stainless steel. For applications exposed to moisture, mild chemicals, or outdoor environments, apply a compatible bearing grease or lubricant to protect the surface. If your application requires stainless steel balls, contact us to confirm availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre both metric and imperial sizes available?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The range includes clean metric steps (8mm, 9mm, 10mm, 12mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm) alongside fractional-inch equivalents such as 7.938mm (5\/16\"), 9.525mm (3\/8\"), 11.113mm (7\/16\"), 12.7mm (1\/2\"), 14.288mm (9\/16\"), 15.875mm (5\/8\"), 17.463mm (11\/16\"), 19.05mm (3\/4\"), 19.844mm (25\/32\"), and 21.431mm (27\/32\"). Select the size that matches your existing ball or race specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in bicycle hubs or caster wheels?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Steel ball bearings in this size range are commonly used in bicycle cup-and-cone hubs, caster wheel assemblies, and drawer slide mechanisms. Measure the existing balls before ordering to confirm the diameter. For bicycle hubs, common sizes include 3\/16\" (4.763mm — not in this range), 1\/4\" (6.35mm — not in this range), and 5\/16\" (7.938mm) through 3\/8\" (9.525mm), which are covered here. Always verify your specific hub specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich pack size should I choose — 10, 20, or 50 pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eChoose based on your application volume. A pack of 10 suits a single bearing replacement where you need a few spares. A pack of 20 is practical for servicing multiple bearings of the same size in one session. A pack of 50 is cost-effective for production environments, maintenance stock, or applications where balls are replaced on a regular schedule. Larger packs offer a lower per-piece cost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store unused steel ball bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStore unused balls in a dry, covered container away from moisture and direct contact with dissimilar metals to prevent surface oxidation. A light coating of machine oil or bearing grease on stored balls will extend their shelf life. Keep them in their original packaging or a labeled parts bin sorted by diameter to avoid mixing sizes.\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 quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"7.938mm \/ 20","offer_id":52410205339922,"sku":"GLFBLFFJSSYX0285x20","price":2.76,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 20","offer_id":52410205372690,"sku":"GLFBLFFJSSYX0286x20","price":2.86,"currency_code":"USD","in_stock":true},{"title":"8.1mm \/ 20","offer_id":52410205405458,"sku":"GLFBLFFJSSYX0287x20","price":2.92,"currency_code":"USD","in_stock":true},{"title":"8.5mm \/ 20","offer_id":52410205438226,"sku":"GLFBLFFJSSYX0288x20","price":3.07,"currency_code":"USD","in_stock":true},{"title":"8.731mm \/ 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