{"product_id":"loose-steel-ball-bearings-40-50mm","title":"Loose Steel Ball Bearings Round Solid Metal Balls Diameter 40\/40.1\/40.2-50.8mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eLoose Steel Ball Bearings 40–50.8mm — Precision Round Solid Metal Balls for Industrial \u0026amp; DIY Use\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized rolling element causes vibration, noise, or premature bearing failure, finding the exact replacement diameter is critical. Engineers, maintenance technicians, and serious DIYers who work with large-bore bearings, linear slides, ball screws, and custom mechanical assemblies need a reliable source for precision loose steel ball bearings in the 40–50.8 mm range — a size bracket that most hardware stores simply don't stock.\u003c\/p\u003e\n\u003cp\u003eThese loose steel ball bearings are machined from solid carbon steel stock and cover 24 distinct diameters from 40 mm (≈ 1.575 in) up to 50.8 mm (≈ 2.0 in), including fractional inch equivalents such as 41.275 mm (1-5\/8 in), 44.45 mm (1-3\/4 in), 47.625 mm (1-7\/8 in), and 50.8 mm (2 in). Each ball is ground to a consistent spherical form with a smooth surface finish suited for rolling contact applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing loose steel ball bearings in heavy-duty thrust bearings and slewing rings, filling ball-transfer units on conveyor tables, acting as grinding media in small batch mills, and serving as precision spacers or detent elements in custom jigs and fixtures. The multi-piece quantity options (1–5 pcs per order) let maintenance teams stock exactly what they need without over-ordering.\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 sold as loose rolling elements only — they are not pre-assembled into a bearing race. Verify the bore diameter of your bearing housing or retainer before ordering. Diameter tolerance and grade are not specified; contact us to confirm if your application requires a specific ABEC or ISO grade.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Loose 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\u003e24 Precise Diameters:\u003c\/strong\u003e Covers 40 mm through 50.8 mm in increments as fine as 0.1 mm, including common fractional-inch equivalents (1-5\/8\", 1-3\/4\", 1-7\/8\", 2\") for cross-compatibility with inch-standard equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eSolid Carbon Steel Construction:\u003c\/strong\u003e Each ball is machined from solid steel — no hollow core — delivering the load-bearing capacity and dimensional stability required in thrust, radial, and linear rolling contact applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eSmooth Ground Surface Finish:\u003c\/strong\u003e The spherical surface is ground to a consistent finish that reduces friction and wear when used as a replacement rolling element or in ball-transfer and detent mechanisms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Options (1–5 PCS):\u003c\/strong\u003e Order a single ball for a one-off repair or up to five pieces to keep spares on hand — no need to purchase a full bag of mixed sizes when you only need one specific diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range in One Listing:\u003c\/strong\u003e From 40 mm to 50.8 mm, this listing consolidates a bracket of large-diameter loose steel ball bearings that are difficult to source locally, reducing lead time for maintenance and repair jobs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eVersatile Application Fit:\u003c\/strong\u003e Suitable for thrust bearing replacement, ball-transfer unit refilling, grinding media, detent plungers, custom jig spacers, and other mechanical assemblies requiring a precision spherical rolling element.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Loose Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003ctd\u003eSolid sphere (loose, unassembled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e40 mm – 50.8 mm (≈ 1.575 in – 2.0 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e40, 40.1, 40.2, 40.5, 41, 41.275, 41.5, 42, 42.5, 42.863, 43, 44, 44.45, 45, 46, 47, 47.625, 48, 48.4, 49, 49.2, 49.5, 50, 50.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround spherical surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 3 PCS \/ 4 PCS \/ 5 PCS (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Grade \/ Tolerance\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003eWeight (per ball)\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 correct diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the inner diameter of the bearing retainer or housing pocket that holds the ball, using a digital caliper. The ball diameter should match that measurement within the tolerance your application allows. If you are replacing a worn ball in an existing bearing, measure a known-good ball from the same set rather than the worn one. For critical applications, contact us to confirm the required tolerance grade before ordering.\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\u003eThese balls are machined from solid carbon steel, which provides the hardness and compressive strength needed for typical rolling contact loads in thrust bearings, ball-transfer units, and similar mechanisms. For applications with very high dynamic loads or shock loading, confirm the steel grade and hardness specification with us before use, as load capacity depends on both ball grade and the surrounding bearing design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these steel balls rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel balls are susceptible to surface oxidation when exposed to moisture or corrosive environments without protection. For indoor, dry, or lightly lubricated applications this is generally manageable with a light oil coating. If your application involves water, chemicals, or outdoor exposure, consider stainless steel balls instead, or contact us to discuss corrosion-resistant options for your specific diameter requirement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard bearing races and retainers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are loose rolling elements sold without a race or retainer. They are dimensionally compatible with any bearing housing or retainer designed for the same nominal ball diameter. However, bearing grade (ABEC 1 through ABEC 7, or ISO equivalents) affects dimensional tolerance and surface finish — if your application requires a specific grade, please contact us to confirm availability before ordering.\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\u003eYes, solid steel balls in this size range are commonly used as grinding media in small batch ball mills for pigments, ceramics, and similar materials. The solid carbon steel construction provides the mass and hardness needed for effective grinding. Ensure the mill drum material is compatible with steel contact, and note that grinding abrasive or chemically aggressive materials may accelerate ball wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide between ordering 1 PCS vs. multiple pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOrder 1 PCS if you need a single replacement ball for a repair. Order 2–5 PCS if you are refilling a ball-transfer unit (which typically uses multiple balls of the same diameter), stocking spares for ongoing maintenance, or need balls for a custom assembly that requires more than one rolling element. The per-unit price decreases slightly with larger quantities, making multi-piece orders more economical for recurring needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the fractional-inch diameters (e.g., 41.275 mm, 44.45 mm) and the metric ones?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe fractional-inch diameters are metric conversions of standard inch sizes: 41.275 mm = 1-5\/8 in, 44.45 mm = 1-3\/4 in, 47.625 mm = 1-7\/8 in, and 50.8 mm = 2 in. These are included because many older or North American-standard bearings, ball-transfer units, and machinery use inch-based ball sizes. If your equipment documentation lists a ball size in inches, select the corresponding mm equivalent from the variant options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Diameter(mm) and Quantity(PCS) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"40mm \/ 1PCS","offer_id":52409989234962,"sku":"GLFBTXJ2024GANGZHU3012x1","price":9.72,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 2PCS","offer_id":52409989267730,"sku":"GLFBTXJ2024GANGZHU3012x2","price":18.54,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 3PCS","offer_id":52409989300498,"sku":"GLFBTXJ2024GANGZHU3012x3","price":27.35,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 4PCS","offer_id":52409989333266,"sku":"GLFBTXJ2024GANGZHU3012x4","price":36.16,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 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