{"product_id":"g10-gcr15-precision-bearing-steel-balls","title":"G10 Grade Bearing Steel Ball Precision Gcr15 Mechanical Steel Balls Bearings","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eG10 Grade Gcr15 Bearing Steel Balls — Precision Rolling Elements for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized ball causes vibration, noise, or premature bearing failure, the root cause is almost always dimensional inconsistency. Engineers, maintenance technicians, and DIY machine builders who need a reliable replacement or upgrade turn to G10 grade Gcr15 steel balls because the tolerance band is tight enough to matter in real-world assemblies.\u003c\/p\u003e\n\u003cp\u003eEach ball in this listing is manufactured from Gcr15 high-carbon chromium bearing steel — the same alloy specified in GB\/T 308 and widely cross-referenced to AISI 52100. Diameters span 6.35 mm (¼ in) through 28 mm (1.102 in), covering both metric and common inch-series sizes. G10 grade means the diameter deviation and sphericity error are held within 0.25 µm, making these balls suitable for precision-grade bearing assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacement rolling elements in deep-groove ball bearings, recirculating balls in linear guide carriages and ball screws, load-distributing balls in check valves and hydraulic fittings, and anti-friction media in rotary indexing tables and spindle assemblies.\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 deep-groove bearings, linear guides, ball screws, check valves, and other assemblies requiring G10-grade rolling elements in the 6.35–28 mm diameter range.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These G10 Gcr15 Precision 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\u003eG10 Precision Grade\u003c\/strong\u003e — Diameter deviation and sphericity error within 0.25 µm per ISO 3290-1, suitable for precision bearing and linear-motion assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eGcr15 \/ AISI 52100 Alloy\u003c\/strong\u003e — High-carbon chromium steel with a typical hardness of 60–66 HRC after heat treatment, delivering strong resistance to rolling contact fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e — 6.35 mm to 28 mm in metric and inch-series sizes, including fractional dimensions such as 7.938 mm (5\/16 in), 9.525 mm (3\/8 in), and 25.4 mm (1 in).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 5, 50, 100, or 200-piece packs so you can order exactly what a repair or build requires without excess stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eConsistent Surface Finish\u003c\/strong\u003e — Bright, smooth surface finish minimizes friction and supports even load distribution across the raceway contact zone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e — Suited for deep-groove bearings, angular-contact bearings, linear guides, ball screws, check valves, and rotary indexing mechanisms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — G10 Gcr15 Bearing Steel Balls\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 (cross-ref: AISI 52100)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrecision Grade\u003c\/th\u003e\n\u003ctd\u003eG10 (per ISO 3290-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e6.35 mm – 28 mm (¼ in – 1.102 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Deviation\u003c\/th\u003e\n\u003ctd\u003e≤ 0.25 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSphericity Error\u003c\/th\u003e\n\u003ctd\u003e≤ 0.25 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Roughness (Ra)\u003c\/th\u003e\n\u003ctd\u003e≤ 0.010 µm (typical for G10)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003e60 – 66 HRC (after heat treatment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBright, uncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 50 \/ 100 \/ 200 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Standard\u003c\/th\u003e\n\u003ctd\u003eISO 3290-1, GB\/T 308\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 identify the correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the bore (inner diameter) and outer diameter of the bearing, then consult the bearing's datasheet or use a micrometer to measure a worn ball directly. The ball diameter is typically listed in the bearing designation suffix or in the manufacturer's dimensional table. For inch-series bearings, common sizes include 6.35 mm (¼ in), 7.938 mm (5\/16 in), 9.525 mm (3\/8 in), and 25.4 mm (1 in) — all available in this listing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G10 grade mean, and when do I need it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG10 is a precision grade defined by ISO 3290-1. It specifies that the diameter deviation and sphericity error of each ball must not exceed 0.25 µm. G10 is appropriate for precision bearings, ball screws, and linear guides where dimensional consistency directly affects noise, vibration, and service life. For general-purpose or low-speed applications, a lower grade (G16 or G40) may be sufficient, but G10 is the standard choice for machine tool and instrumentation work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs Gcr15 the same as AISI 52100 bearing steel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Gcr15 is the Chinese GB designation for a high-carbon chromium bearing steel that is chemically and mechanically equivalent to AISI 52100 (USA), 100Cr6 (DIN\/EN), and SUJ2 (JIS). All four designations describe a steel with approximately 0.95–1.05% carbon and 1.30–1.65% chromium, heat-treated to 60–66 HRC. Parts specified to any of these standards can be substituted with Gcr15 balls.\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\u003eGcr15 \/ AISI 52100 is a through-hardened carbon steel and is not inherently corrosion-resistant. In humid, wet, or chemically aggressive environments, surface rust can develop without lubrication or protective coating. For corrosive environments, consider stainless steel balls (AISI 440C) instead. In standard dry or lightly lubricated indoor applications, Gcr15 balls perform reliably when kept clean and lightly oiled.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in a ball screw or linear guide?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the diameter matches the recirculating ball channel specification of your ball screw or linear guide. Measure the existing balls with a micrometer before ordering. Ball screws and linear guides are sensitive to ball diameter variation — using balls that are even a few micrometres oversized can cause binding, while undersized balls increase backlash. G10 grade is the appropriate precision level for most ball screw and linear guide applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store and handle these bearing balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStore balls in a clean, dry environment away from moisture and contaminants. Handle with clean, lint-free gloves or non-metallic tweezers to avoid transferring skin oils or particles that can initiate surface corrosion. Before installation, clean the balls with a lint-free cloth and apply a thin film of bearing-grade grease or oil appropriate for your application's speed and load conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat packing quantity should I order for a bearing replacement?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCount the number of balls in the bearing you are replacing — this is typically listed in the bearing's datasheet under \"number of balls\" or can be counted directly after disassembly. Order that quantity plus a few spares. For production or maintenance stock, the 100-piece or 200-piece packs offer a lower per-unit cost. For single-bearing repairs or prototyping, the 1-piece or 5-piece options let you order exactly what you need.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Material, Diameter, and Packing Qty 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 \/ 200pcs","offer_id":52410409681170,"sku":"LFL2024GANGZHU2060x200","price":28.42,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.5mm \/ 200pcs","offer_id":52410409713938,"sku":"LFL2024GANGZHU2061x200","price":29.62,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 6.747mm \/ 200pcs","offer_id":52410409746706,"sku":"LFL2024GANGZHU2062x200","price":32.23,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 7mm \/ 200pcs","offer_id":52410409779474,"sku":"LFL2024GANGZHU2063x200","price":35.33,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 7.144mm \/ 200pcs","offer_id":52410409812242,"sku":"LFL2024GANGZHU2064x200","price":37.51,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 7.5mm \/ 200pcs","offer_id":52410409845010,"sku":"LFL2024GANGZHU2065x200","price":42.3,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 7.938mm \/ 100pcs","offer_id":52410409877778,"sku":"LFL2024GANGZHU2066x100","price":26.36,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 8mm \/ 100pcs","offer_id":52410409910546,"sku":"LFL2024GANGZHU2067x100","price":26.9,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 8.5mm \/ 100pcs","offer_id":52410409943314,"sku":"LFL2024GANGZHU2068x100","price":32.23,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 8.731mm \/ 100pcs","offer_id":52410409976082,"sku":"LFL2024GANGZHU2069x100","price":34.41,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 9mm \/ 100pcs","offer_id":52410410008850,"sku":"LFL2024GANGZHU2070x100","price":37.51,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 9.525mm \/ 100pcs","offer_id":52410410041618,"sku":"LFL2024GANGZHU2071x100","price":44.04,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 10mm \/ 100pcs","offer_id":52410410074386,"sku":"LFL2024GANGZHU2072x100","price":50.84,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 10.318mm \/ 100pcs","offer_id":52410410107154,"sku":"LFL2024GANGZHU2073x100","price":55.62,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11mm \/ 50pcs","offer_id":52410410139922,"sku":"LFL2024GANGZHU2074x50","price":34.68,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11.1125mm \/ 50pcs","offer_id":52410410172690,"sku":"LFL2024GANGZHU2075x50","price":36.15,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11.5mm \/ 50pcs","offer_id":52410410205458,"sku":"LFL2024GANGZHU2076x50","price":39.14,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11.509mm \/ 50pcs","offer_id":52410410238226,"sku":"LFL2024GANGZHU2077x50","price":39.41,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 11.906mm \/ 50pcs","offer_id":52410410270994,"sku":"LFL2024GANGZHU2078x50","price":43.22,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 12mm \/ 50pcs","offer_id":52410410303762,"sku":"LFL2024GANGZHU2079x50","price":43.93,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 12.303mm \/ 50pcs","offer_id":52410410336530,"sku":"LFL2024GANGZHU2080x50","price":47.46,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 12.5mm \/ 50pcs","offer_id":52410410369298,"sku":"LFL2024GANGZHU2081x50","price":49.64,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 12.7mm \/ 50pcs","offer_id":52410410402066,"sku":"LFL2024GANGZHU2082x50","price":51.92,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 13mm \/ 50pcs","offer_id":52410410434834,"sku":"LFL2024GANGZHU2083x50","price":56.0,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 13.494mm \/ 50pcs","offer_id":52410410467602,"sku":"LFL2024GANGZHU2084x50","price":59.0,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 14mm \/ 5pcs","offer_id":52410410500370,"sku":"LFL2024GANGZHU2213x5","price":10.17,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 14.2875mm \/ 5pcs","offer_id":52410410533138,"sku":"LFL2024GANGZHU2214x5","price":10.72,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 15mm \/ 5pcs","offer_id":52410410565906,"sku":"LFL2024GANGZHU2215x5","price":11.87,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 15.081mm \/ 5pcs","offer_id":52410410598674,"sku":"LFL2024GANGZHU2216x5","price":12.08,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 16mm \/ 5pcs","offer_id":52410410631442,"sku":"LFL2024GANGZHU2217x5","price":11.12,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 16.668mm \/ 5pcs","offer_id":52410410664210,"sku":"LFL2024GANGZHU2218x5","price":12.21,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 17mm \/ 5pcs","offer_id":52410410696978,"sku":"LFL2024GANGZHU2219x5","price":13.3,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 17.4625mm \/ 5pcs","offer_id":52410410729746,"sku":"LFL2024GANGZHU2220x5","price":14.28,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 18mm \/ 5pcs","offer_id":52410410762514,"sku":"LFL2024GANGZHU2221x5","price":15.48,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 19mm \/ 5pcs","offer_id":52410410795282,"sku":"LFL2024GANGZHU2222x5","price":17.65,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 19.05mm \/ 5pcs","offer_id":52410410828050,"sku":"LFL2024GANGZHU2223x5","price":17.65,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 20mm \/ 1pcs","offer_id":52410410860818,"sku":"LFL2024GANGZHU2224x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 21mm \/ 1pcs","offer_id":52410410893586,"sku":"LFL2024GANGZHU2225x1","price":7.45,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 22mm \/ 1pcs","offer_id":52410410926354,"sku":"LFL2024GANGZHU2226x1","price":8.13,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 22.225mm \/ 1pcs","offer_id":52410410959122,"sku":"LFL2024GANGZHU2227x1","price":8.34,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 23mm \/ 1pcs","offer_id":52410410991890,"sku":"LFL2024GANGZHU2228x1","price":9.02,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 24mm \/ 1pcs","offer_id":52410411024658,"sku":"LFL2024GANGZHU2229x1","price":9.83,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 25mm \/ 1pcs","offer_id":52410411057426,"sku":"LFL2024GANGZHU2230x1","price":10.72,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 25.4mm \/ 1pcs","offer_id":52410411090194,"sku":"LFL2024GANGZHU2231x1","price":11.19,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 26mm \/ 1pcs","offer_id":52410411122962,"sku":"LFL2024GANGZHU2232x1","price":11.87,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 27mm \/ 1pcs","offer_id":52410411155730,"sku":"LFL2024GANGZHU2233x1","price":12.89,"currency_code":"USD","in_stock":true},{"title":"Gcr15 \/ 28mm \/ 1pcs","offer_id":52410411188498,"sku":"LFL2024GANGZHU2234x1","price":11.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-02_0f99ea31-be92-4ba7-b02b-04020217a2d9.jpg?v=1782439913","url":"https:\/\/homediyer.com\/products\/g10-gcr15-precision-bearing-steel-balls","provider":"HomeDIYer","version":"1.0","type":"link"}