{"product_id":"bearing-steel-ball-dia-30-200mm-high-precision-chrome-steel-balls","title":"Bearing Steel Ball Dia 30.163mm-200mm High Precision Bearings Balls Metal Ball","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBearing Steel Balls 30–200mm — Precision Chrome Steel Rolling Elements for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized ball causes vibration, noise, or premature bearing failure, finding the exact replacement diameter is the difference between a quick fix and a costly downtime event. Machinists, maintenance engineers, and serious DIYers who work with industrial bearings, ball valves, and precision assemblies need rolling elements they can trust to spec — not approximate.\u003c\/p\u003e\n\u003cp\u003eThese bearing steel balls are manufactured from chrome steel (GCr15 \/ 52100 equivalent) and are available in a wide range of diameters from 30.163 mm (approx. 1.19\") to 200 mm (approx. 7.87\"), covering both metric and inch-series sizes. Each ball is ground and lapped to achieve a smooth, consistent spherical surface suited for load-bearing and rolling contact applications. Sold in quantities of 1, 3, or 5 pieces per order to match your exact replacement or project needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing worn rolling elements in deep-groove ball bearings, angular contact bearings, and thrust bearings; seating in ball valves and check valves for fluid control systems; and serving as precision transfer balls in material handling fixtures, jigs, and tooling plates. The broad diameter range also makes these balls suitable for custom mechanical assemblies where standard off-the-shelf bearings are not available.\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 individual rolling elements — not as complete bearing assemblies. Verify your required diameter against your bearing's ball complement specification before ordering. Both metric (mm) and inch-derived sizes (e.g., 31.75 mm = 1-1\/4\", 38.1 mm = 1-1\/2\") are available. Contact us to confirm fit for critical applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Bearing Steel Balls\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eChrome Steel Construction:\u003c\/strong\u003e Made from GCr15 \/ AISI 52100 equivalent chrome steel — the industry-standard alloy for rolling bearing elements, offering a balance of hardness, wear resistance, and fatigue life under cyclic loading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range:\u003c\/strong\u003e Available from 30.163 mm to 200 mm (approx. 1.19\" to 7.87\"), covering both metric and common inch-derived sizes. Includes fractional sizes such as 31.75 mm (1-1\/4\"), 38.1 mm (1-1\/2\"), 44.45 mm (1-3\/4\"), and 76.2 mm (3\").\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eGround and Lapped Surface Finish:\u003c\/strong\u003e Each ball is precision-ground to a smooth spherical surface, reducing friction and ensuring consistent rolling contact — critical for bearing performance and valve sealing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect Replacement Compatibility:\u003c\/strong\u003e Sized to match standard bearing ball complements for deep-groove, angular contact, and thrust bearing types. Suitable for use as replacement rolling elements when individual balls are damaged or missing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Options:\u003c\/strong\u003e Available in packs of 1, 3, or 5 pieces — order only what you need for a single repair, a full complement replacement, or a small project batch without committing to bulk quantities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eBroad Application Range:\u003c\/strong\u003e Suited for industrial bearings, ball valves, check valves, transfer ball fixtures, jigs, tooling plates, and custom mechanical assemblies requiring precision spherical rolling elements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Bearing Steel Balls\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eChrome steel (GCr15 \/ AISI 52100 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e30.163 mm – 200 mm (approx. 1.19\" – 7.87\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003eSee variant options (metric and inch-derived sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround and lapped spherical surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options (typically 60–66 HRC for GCr15 chrome steel)\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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1, 3, or 5 pieces (select via Quantity option)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eBall bearings, ball valves, check valves, transfer fixtures, precision assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eStandard chrome steel (not stainless); contact us to confirm for corrosive environments\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\u003eCheck your bearing's part number against the manufacturer's datasheet, which lists the ball diameter and complement count. Alternatively, carefully remove one ball from the bearing and measure its diameter with a micrometer or digital caliper. Match that measurement to the closest available size in our variant list. For inch-series bearings, note that sizes like 31.75 mm (1-1\/4\"), 38.1 mm (1-1\/2\"), and 44.45 mm (1-3\/4\") correspond to standard fractional inch dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat steel grade are these balls made from, and how hard are they?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are made from GCr15 chrome steel, which is equivalent to AISI 52100 — the most widely used alloy for bearing rolling elements. After heat treatment, GCr15 chrome steel typically achieves a hardness of 60–66 HRC, providing the wear resistance and fatigue strength required for rolling contact under load. This grade is not stainless steel; for corrosive or wet environments, please contact us to discuss material alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls suitable for use in ball valves and check valves?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Chrome steel balls are commonly used as seating elements in ball valves and check valves in non-corrosive fluid systems. The ground and lapped surface finish provides the smooth, consistent spherical geometry needed for reliable sealing. For applications involving water, mild chemicals, or steam, verify that chrome steel is compatible with your media — stainless steel balls may be more appropriate for corrosive or food-grade environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as replacement balls in an existing bearing without replacing the entire bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn many cases, yes — if only one or a few balls are damaged, replacing the affected balls can restore bearing function. However, for critical or high-speed applications, it is generally recommended to replace the full ball complement at once to maintain uniform load distribution and avoid premature fatigue from mixed wear states. Always inspect the bearing races for scoring or pitting before reinstalling with new balls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy are some sizes listed in decimal millimeters like 30.163 mm or 34.925 mm?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese decimal millimeter values are the metric equivalents of standard inch-series ball sizes. For example, 30.163 mm = 1-3\/16\", 34.925 mm = 1-3\/8\", and 39.688 mm = 1-9\/16\". Inch-series bearings manufactured to ABEC or RBEC standards use these fractional inch ball diameters, which when converted to millimeters produce the decimal values you see in the variant list. If you know your ball size in inches, multiply by 25.4 to find the equivalent millimeter size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I select between ordering 1, 3, or 5 pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOrder 1 piece if you need a single replacement ball for a spot repair or to verify fit before committing to a larger quantity. Order 3 pieces if you are replacing a partial complement or need a small spare stock. Order 5 pieces if you are replacing a full complement in a smaller bearing, running a batch repair on multiple units, or want to keep spares on hand for future maintenance. For larger quantities, please contact us directly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these balls require any surface treatment or lubrication before installation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eChrome steel balls are typically supplied with a light protective oil coating to prevent surface oxidation during storage and transit. Before installation in a bearing, wipe the balls clean with a lint-free cloth and apply the appropriate bearing grease or oil specified for your application. Do not install dry — even a thin film of lubricant significantly extends rolling element life by reducing metal-to-metal contact at the ball-race interface.\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 Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"30.163mm \/ 1","offer_id":52409996837138,"sku":"KFCJSSYX0359x1","price":3.52,"currency_code":"USD","in_stock":true},{"title":"30.163mm \/ 3","offer_id":52409996869906,"sku":"KFCJSSYX0359x3","price":13.34,"currency_code":"USD","in_stock":true},{"title":"30.163mm \/ 5","offer_id":52409996902674,"sku":"KFCJSSYX0359x5","price":21.76,"currency_code":"USD","in_stock":true},{"title":"31mm \/ 1","offer_id":52409996935442,"sku":"KFCJSSYX0360x1","price":5.21,"currency_code":"USD","in_stock":true},{"title":"31mm \/ 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