{"product_id":"gcr15-steel-ball-bearings-g10-635mm-64mm-100pcs","title":"100pcs Bicycle G10 Gcr15 Steel Ball Bearing Replacement Bearings 6.35mm-6.4mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eG10 Gcr15 Steel Ball Bearings — Precision Replacement for Bicycles \u0026amp; Machinery\u003c\/h2\u003e\n\u003cp\u003eWhen worn or undersized bearing balls cause play, noise, or premature hub failure, finding the exact replacement diameter matters. Cyclists, mechanics, and precision equipment technicians who need tight-tolerance rolling elements in the 6.35–6.4mm range will find this pack covers eleven incremental sizes in a single order.\u003c\/p\u003e\n\u003cp\u003eEach pack contains 100 pieces of G10-grade Gcr15 high-carbon chromium steel ball bearings. Diameters span 6.35mm (0.250 in) through 6.4mm (0.252 in) in 0.005mm steps, allowing precise matching to worn races. The Gcr15 alloy delivers a surface hardness typically in the 60–66 HRC range and a smooth, lapped finish consistent with G10 tolerance class.\u003c\/p\u003e\n\u003cp\u003eTypical applications include bicycle bottom bracket and hub bearing replacement, inline skate wheel bearings, small electric motor spindles, and precision jig or fixture assemblies where exact ball diameter determines running clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e Compatible with standard open and shielded bearing races accepting 6.35–6.4mm balls — verify your race groove diameter before selecting a variant.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Gcr15 Steel Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eG10 Precision Grade\u003c\/strong\u003e — Diameter tolerance within ±0.000125 in (±0.003175 mm), ensuring consistent fit across all 100 pieces in the pack.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eGcr15 High-Carbon Chromium Steel\u003c\/strong\u003e — Alloy composition provides high hardness, wear resistance, and fatigue life suited to cyclic rolling contact loads.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e11 Incremental Diameters Available\u003c\/strong\u003e — From 6.35mm to 6.4mm in 0.005mm steps, letting you match the exact ball size your race requires rather than settling for the nearest standard.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eSmooth Lapped Surface Finish\u003c\/strong\u003e — G10 surface roughness specification reduces friction and heat generation in high-cycle applications such as bicycle hubs and spindle bearings.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003e100-Piece Pack\u003c\/strong\u003e — Sufficient quantity for multiple bearing sets or a workshop stock of replacement balls, reducing per-unit cost on routine maintenance jobs.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Alloy Core\u003c\/strong\u003e — Gcr15 chromium content provides baseline oxidation resistance; store in a dry environment or apply light oil for extended shelf life.\u003c\/div\u003e\n\u003c\/div\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\u003eGcr15 High-Carbon Chromium Bearing Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrecision Grade\u003c\/th\u003e\n\u003ctd\u003eG10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e6.35mm – 6.4mm (0.250 in – 0.252 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Increments\u003c\/th\u003e\n\u003ctd\u003e0.005mm steps (6.35 \/ 6.355 \/ 6.36 \/ 6.365 \/ 6.37 \/ 6.375 \/ 6.38 \/ 6.385 \/ 6.39 \/ 6.395 \/ 6.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Tolerance (G10)\u003c\/th\u003e\n\u003ctd\u003e±0.003175mm (±0.000125 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Hardness\u003c\/th\u003e\n\u003ctd\u003eTypically 60–66 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eLapped, consistent with G10 class\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e100 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Qty\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eBicycle hubs, bottom brackets, inline skates, small motors, precision fixtures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per pack)\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 determine which diameter I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the diameter of the existing balls with a micrometer or digital caliper. If the balls are worn, measure the race groove width and subtract the designed clearance (typically 0.005–0.015mm for bicycle hubs). Select the variant whose diameter matches your measurement. When in doubt, order one size up and one size down to test fit before committing to a full replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G10 grade mean for ball bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG10 is a precision grade defined by ABMA\/ISO standards. It specifies that the diameter deviation of any single ball from the nominal size is within ±0.000125 in (±0.003175mm), and the variation between balls in the same lot is similarly controlled. G10 is suitable for most bicycle and light machinery applications where smooth running and low noise are required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs Gcr15 steel suitable for outdoor or wet conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGcr15 provides moderate corrosion resistance due to its chromium content, but it is not stainless steel. For applications exposed to water, mud, or salt, apply a light bearing grease or oil after installation and consider sealed bearing housings. Regular maintenance will significantly extend service life in wet environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these balls be used in applications other than bicycles?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The 6.35–6.4mm diameter range is common in inline skate wheels, small electric motors, precision jigs, and light industrial spindles. As long as your bearing race is designed for balls in this diameter range and the G10 tolerance class meets your application's requirements, these balls are a direct replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between the 11 available diameter variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach variant differs by 0.005mm. Start by measuring your existing balls or race groove. If you are replacing worn balls, you may need to go 0.005–0.01mm larger than the original nominal size to restore proper preload. If you are unsure, contact us with your bearing model or race dimensions and we can recommend the correct variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat quantity is included and is bulk pricing available?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach pack contains 100 pieces of the selected diameter. This quantity is sufficient for multiple bearing sets on a bicycle or a workshop stock supply. If you require larger quantities for commercial or fleet maintenance use, please contact us to confirm availability and pricing for bulk orders.\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":"Gcr15 \/ 6.35mm \/ 100pcs","offer_id":52410325500178,"sku":"LFL2024GANGZHU4695x100","price":8.74,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.355mm \/ 100pcs","offer_id":52410325532946,"sku":"LFL2024GANGZHU4696x100","price":10.27,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.36mm \/ 100pcs","offer_id":52410325565714,"sku":"LFL2024GANGZHU4697x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.365mm \/ 100pcs","offer_id":52410325598482,"sku":"LFL2024GANGZHU4698x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.37mm \/ 100pcs","offer_id":52410325631250,"sku":"LFL2024GANGZHU4699x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.375mm \/ 100pcs","offer_id":52410325664018,"sku":"LFL2024GANGZHU4700x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.38mm \/ 100pcs","offer_id":52410325696786,"sku":"LFL2024GANGZHU4701x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.385mm \/ 100pcs","offer_id":52410325729554,"sku":"LFL2024GANGZHU4702x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.39mm \/ 100pcs","offer_id":52410325762322,"sku":"LFL2024GANGZHU4703x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.395mm \/ 100pcs","offer_id":52410325795090,"sku":"LFL2024GANGZHU4704x100","price":13.44,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.4mm \/ 100pcs","offer_id":52410325827858,"sku":"LFL2024GANGZHU4705x100","price":10.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture7of7_5c279b47-2f12-42db-b374-db345884b5dc.jpg?v=1782431658","url":"https:\/\/homediyer.com\/products\/gcr15-steel-ball-bearings-g10-635mm-64mm-100pcs","provider":"HomeDIYer","version":"1.0","type":"link"}