{"product_id":"gcr15-steel-ball-bearing-g10-1kg-5-45mm-6-98mm","title":"1kg Gcr15 Steel Ball Bearing G10 Replacement Bearings Diameter 5.45mm-6.98mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGCr15 Steel Ball Bearings G10 — Precision Replacement Balls for Tight-Tolerance Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized ball causes vibration, noise, or premature bearing failure, finding a replacement that meets the original dimensional spec is non-negotiable. Engineers, maintenance technicians, and precision-equipment rebuilders rely on GCr15 steel ball bearings in G10 grade to restore bearing assemblies to factory performance without the cost of a full replacement unit.\u003c\/p\u003e\n\u003cp\u003eEach 1 kg pack contains GCr15 high-carbon chromium bearing steel balls finished to ISO 3290 G10 precision grade. Available diameters span 5.45 mm (0.215 in) to 6.98 mm (0.275 in) across 20 discrete sizes. Surface roughness is typically Ra ≤ 0.010 µm, with diameter deviation and spherical error held within G10 tolerances (≤ 0.25 µm deviation per ISO 3290).\u003c\/p\u003e\n\u003cp\u003eTypical use cases include radial ball bearing rebuilds in electric motors and gearboxes, linear guide carriage replacement in CNC machines and 3D printers, and load-bearing assemblies in automotive steering columns and bicycle hubs where consistent ball diameter is critical to preload and service life.\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 Suitable for deep-groove, angular-contact, and thrust ball bearings. Verify your bearing's ball diameter specification before ordering — select the exact diameter from the variant options above.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GCr15 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\u003eGCr15 Bearing Steel (52100 equivalent)\u003c\/strong\u003e — High-carbon chromium alloy with hardness typically 60–66 HRC after heat treatment, delivering excellent fatigue resistance under cyclic radial and axial loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eG10 ISO Precision Grade\u003c\/strong\u003e — Diameter deviation ≤ 0.25 µm and spherical error ≤ 0.25 µm per ISO 3290, ensuring consistent preload and minimal runout when installed in precision bearing races.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e \u003cstrong\u003eWide Operating Temperature Range\u003c\/strong\u003e — Suitable for continuous operation from approximately −20 °C to +120 °C (−4 °F to +248 °F) in standard lubricated bearing assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eSold by Weight (1 kg per pack)\u003c\/strong\u003e — Consistent 1 kg net weight per order simplifies inventory planning for maintenance shops and production lines that consume balls in bulk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e20 Discrete Diameter Options\u003c\/strong\u003e — Sizes from 5.45 mm to 6.98 mm in increments as fine as 0.01 mm, covering a broad range of metric and near-metric bearing standards in a single product listing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e — Dimensionally interchangeable with OEM balls in standard deep-groove bearings (e.g., 6000–6200 series) and many angular-contact and thrust bearing types where ball diameter falls within this range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — GCr15 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 (equivalent to AISI 52100 \/ DIN 100Cr6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrecision Grade\u003c\/th\u003e\n\u003ctd\u003eG10 (ISO 3290)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e5.45 mm – 6.98 mm (0.215 in – 0.275 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Deviation\u003c\/th\u003e\n\u003ctd\u003e≤ 0.25 µm (G10 per ISO 3290)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpherical Error\u003c\/th\u003e\n\u003ctd\u003e≤ 0.25 µm (G10 per ISO 3290)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Roughness (Ra)\u003c\/th\u003e\n\u003ctd\u003eTypically ≤ 0.010 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eTypically 60–66 HRC (after through-hardening)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eApprox. −20 °C to +120 °C (standard lubricated assembly)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 kg net per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBright polished, no coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Standards\u003c\/th\u003e\n\u003ctd\u003eISO 3290, ABMA Std 10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eDeep-groove bearings, angular-contact bearings, thrust bearings, linear guides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter (per variant)\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 find the correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eRemove one ball from the bearing and measure it with a micrometer or digital caliper. Record the diameter to the nearest 0.01 mm. Match that measurement to the variant options above. If the measured diameter falls between two listed sizes, select the size that matches your original OEM specification — do not upsize, as an oversized ball will increase preload and may cause premature race wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G10 precision grade mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eISO 3290 defines ball precision grades from G3 (tightest) to G1000 (loosest). G10 specifies a maximum diameter deviation and spherical error of 0.25 µm each. For most industrial and hobbyist bearing rebuilds, G10 is the standard grade used in deep-groove and angular-contact bearings. Tighter grades (G5, G3) are reserved for spindle bearings and precision instruments where noise and runout are critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs GCr15 steel corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 (52100) is a through-hardened bearing steel, not a stainless steel. It offers good resistance to wear and fatigue but will rust if exposed to moisture without lubrication. For wet or corrosive environments, apply a compatible bearing grease or oil, or consider stainless steel balls (AISI 440C) instead. These GCr15 balls are best suited for dry or lubricated indoor applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in angular-contact or thrust bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. GCr15 G10 balls are dimensionally and materially compatible with angular-contact and thrust bearing races, provided the ball diameter matches the bearing's specification. Always verify the required ball diameter from the bearing manufacturer's datasheet or by direct measurement before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls are in a 1 kg pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe count varies by diameter. As a reference, a 6.00 mm GCr15 steel ball weighs approximately 0.888 g, so a 1 kg pack contains roughly 1,126 balls at that size. Smaller diameters yield more balls per kilogram; larger diameters yield fewer. If you need an exact count for a specific diameter, contact us and we can provide an estimate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication is recommended for these bearing balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor most applications, a lithium-based NLGI #2 grease or a light mineral oil (ISO VG 32–68) is appropriate. High-speed applications may benefit from a lower-viscosity oil to reduce heat buildup. Avoid water-based lubricants with GCr15 steel to prevent rust. Always clean the bearing race before installing new balls to remove debris that could cause abrasive wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls suitable for CNC linear guide carriages?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the diameter matches your carriage's ball specification. Many linear guide carriages (e.g., HGH, MGN series) use balls in the 3–7 mm range. Select the exact diameter listed in your carriage's service manual. G10 grade is generally acceptable for linear guide replacement; some high-precision carriages specify G5 — check your OEM documentation before ordering.\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 Packing Qty above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"5.45mm \/ 1kg","offer_id":52410414596370,"sku":"LFL2024GANGZHU3041x1","price":102.52,"currency_code":"USD","in_stock":true},{"title":"5.50mm \/ 1kg","offer_id":52410414629138,"sku":"LFL2024GANGZHU3042x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"5.90mm \/ 1kg","offer_id":52410414661906,"sku":"LFL2024GANGZHU3043x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"5.95mm \/ 1kg","offer_id":52410414694674,"sku":"LFL2024GANGZHU3044x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"5.98mm \/ 1kg","offer_id":52410414727442,"sku":"LFL2024GANGZHU3045x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.00mm \/ 1kg","offer_id":52410414760210,"sku":"LFL2024GANGZHU3046x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.01mm \/ 1kg","offer_id":52410414792978,"sku":"LFL2024GANGZHU3047x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.02mm \/ 1kg","offer_id":52410414825746,"sku":"LFL2024GANGZHU3048x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.03mm \/ 1kg","offer_id":52410414858514,"sku":"LFL2024GANGZHU3049x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.30mm \/ 1kg","offer_id":52410414891282,"sku":"LFL2024GANGZHU3050x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.35mm \/ 1kg","offer_id":52410414924050,"sku":"LFL2024GANGZHU3051x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.40mm \/ 1kg","offer_id":52410414956818,"sku":"LFL2024GANGZHU3052x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.50mm \/ 1kg","offer_id":52410414989586,"sku":"LFL2024GANGZHU3053x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.60mm \/ 1kg","offer_id":52410415022354,"sku":"LFL2024GANGZHU3054x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.70mm \/ 1kg","offer_id":52410415055122,"sku":"LFL2024GANGZHU3055x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.75mm \/ 1kg","offer_id":52410415087890,"sku":"LFL2024GANGZHU3056x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.80mm \/ 1kg","offer_id":52410415120658,"sku":"LFL2024GANGZHU3057x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.90mm \/ 1kg","offer_id":52410415153426,"sku":"LFL2024GANGZHU3058x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.95mm \/ 1kg","offer_id":52410415186194,"sku":"LFL2024GANGZHU3059x1","price":101.86,"currency_code":"USD","in_stock":true},{"title":"6.98mm \/ 1kg","offer_id":52410415218962,"sku":"LFL2024GANGZHU3060x1","price":101.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_81545025-6583-4b72-b1b8-9d5765c10104.jpg?v=1782442053","url":"https:\/\/homediyer.com\/products\/gcr15-steel-ball-bearing-g10-1kg-5-45mm-6-98mm","provider":"HomeDIYer","version":"1.0","type":"link"}