{"product_id":"steel-ball-bearing-replacement-9mm-20mm-carbon-gcr15","title":"1KG Solid Carbon Steel-Gcr15 Steel Ball Bearing Replacement Bearings 9mm-20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSteel Ball Bearings 9mm–20mm — Precision Replacement for Machinery \u0026amp; DIY Builds\u003c\/h2\u003e\n\u003cp\u003eWhen worn or pitted bearing balls cause vibration, noise, or uneven load distribution in your equipment, finding a dimensionally consistent replacement is the first challenge. Whether you're a workshop technician rebuilding a spindle, a hobbyist restoring a vintage tool, or a maker sourcing rolling elements for a custom linear rail, imprecise balls introduce play that compounds wear over time.\u003c\/p\u003e\n\u003cp\u003eThese solid steel ball bearings are sold by the kilogram and available in two materials — standard Carbon Steel and Gcr15 bearing-grade chromium steel — across twelve diameters from 9mm (≈0.354 in) to 20mm (≈0.787 in). Each 1kg pack contains multiple balls; exact count varies by diameter. Balls are manufactured to tight sphericity tolerances suitable for general-purpose bearing replacement and mechanical assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical applications include replacing rolling elements in deep-groove ball bearings for electric motors and power tools, filling ball-screw or linear-guide recirculation tracks, and serving as load-transfer media in jigs, fixtures, and shop-built machinery. Gcr15 variants suit higher-load or higher-cycle applications where carbon steel may fatigue sooner.\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 Fits standard open or shielded ball bearing housings. Match the diameter precisely to your bearing's ball complement specification. Not intended for food-grade or medical-device applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 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\u003eTwo material grades available\u003c\/strong\u003e — Carbon Steel for general workshop use; Gcr15 (chromium bearing steel) for higher-load, longer-cycle applications requiring greater fatigue resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eTwelve diameter options (9mm–20mm)\u003c\/strong\u003e — Covers the most common replacement sizes for small-to-medium bearings in power tools, motors, and shop machinery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eSold by weight (1kg per pack)\u003c\/strong\u003e — Consistent pack weight lets you stock the quantity you need; ball count per pack varies by diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eTight sphericity tolerance\u003c\/strong\u003e — Uniform roundness reduces vibration and uneven load distribution when used as replacement rolling elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad application range\u003c\/strong\u003e — Suitable for deep-groove bearings, ball-screw tracks, linear guides, jigs, and custom mechanical assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eBulk-friendly packaging\u003c\/strong\u003e — 1kg packs are practical for workshop restocking, repair batches, or prototype builds requiring multiple balls.\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 Options\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel; Gcr15 (chromium bearing steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e9mm – 20mm (≈0.354 in – 0.787 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Weight\u003c\/th\u003e\n\u003ctd\u003e1 kg per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Count per Pack\u003c\/th\u003e\n\u003ctd\u003eSee variant options (varies by diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBright \/ polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Gcr15)\u003c\/th\u003e\n\u003ctd\u003eTypically 60–66 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Carbon Steel)\u003c\/th\u003e\n\u003ctd\u003eTypically 55–62 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSphericity Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIntended Use\u003c\/th\u003e\n\u003ctd\u003eBearing replacement, mechanical assemblies, linear guides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate (uncoated steel; keep dry or lightly oiled in storage)\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\u003eWhat is the difference between Carbon Steel and Gcr15 balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon Steel balls are a cost-effective choice for general-purpose applications with moderate loads and cycle counts. Gcr15 is a chromium-alloyed bearing steel with higher hardness (typically 60–66 HRC) and better fatigue resistance, making it the preferred choice for higher-load or high-cycle environments such as spindle bearings, ball screws, and precision machinery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCheck your bearing's datasheet or measure the existing balls with a micrometer. The ball diameter must match the bearing's ball complement specification exactly — even a 0.1mm deviation can cause uneven load distribution and accelerated wear. If you are unsure, contact us to confirm before ordering.\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\u003eBoth Carbon Steel and Gcr15 are uncoated steel and offer moderate corrosion resistance. They are suitable for dry or lightly lubricated indoor environments. For humid, wet, or chemically exposed applications, consider stainless steel balls instead. Store unused balls lightly oiled in a sealed container to prevent surface oxidation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls are in a 1kg pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe ball count per kilogram depends on the diameter. Smaller balls (e.g., 9mm) yield significantly more balls per kilogram than larger ones (e.g., 20mm). If you need an exact count for a specific diameter, contact us and we can provide an estimate based on the nominal ball weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in food-processing or medical equipment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These are uncoated carbon or chromium steel balls without food-grade certification or biocompatibility testing. They are intended for industrial, workshop, and DIY mechanical applications only. For food-grade or medical-device use, stainless steel or ceramic balls with appropriate certifications are required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bearing types are these balls compatible with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are compatible with standard open and shielded deep-groove ball bearings, angular contact bearings, ball-screw recirculation tracks, and linear guide ball complements — provided the diameter matches exactly. They are not pre-assembled into a bearing race; they are loose rolling elements for replacement or custom assembly use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I lubricate the balls before installation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Apply a thin film of appropriate bearing grease or oil before installation to reduce initial wear and prevent dry-start damage. The type of lubricant should match your application's speed, load, and temperature requirements. Consult your equipment's service manual for the recommended lubricant specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Material and Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Carbon Steel \/ 9mm \/ 1kg","offer_id":52409666765074,"sku":"LFL2024GANGZHU3974x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 9mm \/ 1kg","offer_id":52409666797842,"sku":"LFL2024GANGZHU3975x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 10mm \/ 1kg","offer_id":52409666830610,"sku":"LFL2024GANGZHU3976x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 10mm \/ 1kg","offer_id":52409666863378,"sku":"LFL2024GANGZHU3977x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 11mm \/ 1kg","offer_id":52409666896146,"sku":"LFL2024GANGZHU3978x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11mm \/ 1kg","offer_id":52409666928914,"sku":"LFL2024GANGZHU3979x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 12mm \/ 1kg","offer_id":52409666961682,"sku":"LFL2024GANGZHU3980x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 12mm \/ 1kg","offer_id":52409666994450,"sku":"LFL2024GANGZHU3981x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 13mm \/ 1kg","offer_id":52409667027218,"sku":"LFL2024GANGZHU3982x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 13mm \/ 1kg","offer_id":52409667059986,"sku":"LFL2024GANGZHU3983x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 14mm \/ 1kg","offer_id":52409667092754,"sku":"LFL2024GANGZHU3984x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 14mm \/ 1kg","offer_id":52409667125522,"sku":"LFL2024GANGZHU3985x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 15mm \/ 1kg","offer_id":52409667158290,"sku":"LFL2024GANGZHU3986x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 15mm \/ 1kg","offer_id":52409667191058,"sku":"LFL2024GANGZHU3987x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 16mm \/ 1kg","offer_id":52409667223826,"sku":"LFL2024GANGZHU3988x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 16mm \/ 1kg","offer_id":52409667256594,"sku":"LFL2024GANGZHU3989x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 17mm \/ 1kg","offer_id":52409667289362,"sku":"LFL2024GANGZHU3990x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 17mm \/ 1kg","offer_id":52409667322130,"sku":"LFL2024GANGZHU3991x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 18mm \/ 1kg","offer_id":52409667354898,"sku":"LFL2024GANGZHU3992x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 18mm \/ 1kg","offer_id":52409667387666,"sku":"LFL2024GANGZHU3993x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 19mm \/ 1kg","offer_id":52409667420434,"sku":"LFL2024GANGZHU3994x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 19mm \/ 1kg","offer_id":52409667453202,"sku":"LFL2024GANGZHU3995x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 20mm \/ 1kg","offer_id":52409667485970,"sku":"LFL2024GANGZHU3996x1","price":65.29,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 20mm \/ 1kg","offer_id":52409667518738,"sku":"LFL2024GANGZHU3997x1","price":67.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture5of6_2bdbbccc-a931-47ee-8ce9-d1cab1e960e8.jpg?v=1782142613","url":"https:\/\/homediyer.com\/products\/steel-ball-bearing-replacement-9mm-20mm-carbon-gcr15","provider":"HomeDIYer","version":"1.0","type":"link"}