{"product_id":"cast-iron-steel-ball-bearings-sphere-4mm-120mm-smooth-solid","title":"Cast Iron Ball Steel Bearings Sphere Dia 4mm-120mm Smooth Balls Solid Unhardened","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCast Iron Steel Ball Bearings 4mm–120mm — Solid Smooth Spheres for DIY \u0026amp; Industrial Use\u003c\/h2\u003e\n\u003cp\u003eWhen a worn bearing ball causes wobble, noise, or premature failure in your machinery, finding the right replacement size quickly is critical. Whether you are a home workshop enthusiast, a maintenance technician, or a small-batch manufacturer, having access to a wide diameter range in one listing saves time and reduces downtime.\u003c\/p\u003e\n\u003cp\u003eThese solid spheres are made from cast iron and carbon steel, offering a smooth, consistent surface finish. Diameters span from 4 mm (approx. 5\/32 in) up to 120 mm (approx. 4-3\/4 in), with wall thickness being the full solid cross-section — these are not hollow balls. Packing quantities range from single-piece orders up to bulk 2.8 kg bags containing thousands of small-diameter balls.\u003c\/p\u003e\n\u003cp\u003eTypical applications include replacement bearing balls in drawer slides, caster wheels, and linear rail systems; load-distribution balls in jigs and fixtures; and decorative or functional spheres in DIY furniture hardware, valve seats, and grinding media for small-scale milling operations.\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 open-race ball bearing housings, caster assemblies, valve seats, and general mechanical applications requiring solid spherical elements. Verify inner race diameter of your housing before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Cast Iron 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\u003eWide Diameter Range\u003c\/strong\u003e\u003cbr\u003eAvailable from 4 mm to 120 mm (approx. 5\/32 in to 4-3\/4 in) in a single listing — covering small precision applications through to large industrial spheres.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSolid Unhardened Construction\u003c\/strong\u003e\u003cbr\u003eFull solid cross-section with no hollow core. Unhardened grade allows for easier machining or re-purposing in custom jigs and fixtures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eSmooth Surface Finish\u003c\/strong\u003e\u003cbr\u003eConsistent spherical geometry and smooth surface supports low-friction rolling contact in open-race housings and caster wheel assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Packing Quantities\u003c\/strong\u003e\u003cbr\u003eOrder from 1 piece up to bulk 2.8 kg bags (up to 10,000 pcs for 4 mm diameter) — scale your purchase to match project size or stock requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eCast Iron \u0026amp; Carbon Steel Material\u003c\/strong\u003e\u003cbr\u003eCast iron and carbon steel construction provides adequate hardness and weight for general mechanical, decorative, and grinding media applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect Replacement Sizing\u003c\/strong\u003e\u003cbr\u003eDiameter options include both metric (4–120 mm) and common imperial equivalents (4.76 mm ≈ 3\/16 in, 6.35 mm ≈ 1\/4 in, 12.7 mm ≈ 1\/2 in, 25.4 mm ≈ 1 in) for cross-reference convenience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCast iron \/ Carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e4 mm – 120 mm (approx. 5\/32 in – 4-3\/4 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eSolid (unhardened, no hollow core)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSmooth spherical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Options\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS \/ 10 PCS \/ 20 PCS \/ 50 PCS \/ 100 PCS \/ 2.8 KG bulk bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBulk Bag Weight\u003c\/th\u003e\n\u003ctd\u003e2.8 KG per bag (small diameters only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eUnhardened (standard carbon steel grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTolerance\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCommon Imperial Cross-References\u003c\/th\u003e\n\u003ctd\u003e3\/16 in (4.76 mm), 1\/4 in (6.35 mm), 1\/2 in (12.7 mm), 1 in (25.4 mm)\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 application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the inner race diameter of your bearing housing or the seat diameter of your valve\/caster with a caliper. Match that measurement to the closest diameter option in this listing. For imperial-sized housings, use the cross-reference column: 4.76 mm ≈ 3\/16 in, 6.35 mm ≈ 1\/4 in, 12.7 mm ≈ 1\/2 in, 25.4 mm ≈ 1 in.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls hardened or through-hardened?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are unhardened solid balls. They are suitable for general mechanical use, decorative applications, and grinding media in small-scale milling. If your application requires hardened bearing balls (e.g., high-load precision bearings), please check the product specifications or contact us to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the corrosion resistance of these steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCast iron and carbon steel have moderate corrosion resistance. For dry or lightly lubricated indoor environments they perform well. For wet, outdoor, or chemically exposed environments, consider applying a light oil coating or contact us about stainless steel alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard bearing housings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — the smooth spherical geometry is compatible with standard open-race ball bearing housings, caster wheel assemblies, drawer slide bearings, and valve seats. Always verify the inner race diameter of your specific housing matches the ball diameter you select.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich packing quantity should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor single repairs or prototyping, the 1 PCS or 2 PCS options are ideal. For workshop stock or small production runs, 10–50 PCS packs offer better value. The 2.8 KG bulk bags are designed for high-volume use of small-diameter balls (4 mm–6.35 mm) and contain thousands of pieces per bag.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as grinding media in a ball mill?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUnhardened cast iron and carbon steel balls are commonly used as grinding media in small-scale ball mills for pigments, ceramics, and similar materials. For harder or abrasive materials, hardened steel or ceramic media may be more appropriate. Contact us if you need guidance on media selection for your specific milling application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the bulk 2.8 KG bag and the piece-count options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 2.8 KG bulk bag is available for smaller diameters (4 mm–6.35 mm) and contains a fixed weight rather than a fixed piece count — the number of pieces varies by diameter (e.g., approximately 10,000 pcs at 4 mm, approximately 2,680 pcs at 6.35 mm). Piece-count options (1, 2, 5, 10, 20, 50, 100 PCS) are available for most diameters and give you an exact quantity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003eDiameter\u003c\/strong\u003e and \u003cstrong\u003ePacking QTY\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"4mm \/ 2.8KG \/ 10000pcs","offer_id":52410817216786,"sku":"Adaah2024GANGZHU2305x1","price":205.96,"currency_code":"USD","in_stock":true},{"title":"4.5mm \/ 2.8KG \/ 7533pcs","offer_id":52410817249554,"sku":"Adaah2024GANGZHU2306x1","price":205.96,"currency_code":"USD","in_stock":true},{"title":"4.76mm \/ 2.8KG \/ 6360pcs","offer_id":52410817282322,"sku":"Adaah2024GANGZHU2307x1","price":205.96,"currency_code":"USD","in_stock":true},{"title":"5mm \/ 2.8KG \/ 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