{"product_id":"1kg-precision-gcr15-steel-ball-bearing-replacement-bearings-size-3mm-10-5mm","title":"1KG Precision Gcr15 Steel Ball Bearing Replacement Bearings Size: 3mm-10.5mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGCr15 Steel Ball Bearings — Precision Replacement Balls for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen worn or undersized bearing balls cause vibration, noise, or premature failure in your machinery, finding a reliable replacement in the exact diameter you need is critical. These GCr15 precision steel ball bearings are stocked in 26 diameters from 3mm to 10.5mm (approx. 0.118\" to 0.413\"), sold in 1kg packs — giving engineers, maintenance technicians, and serious DIYers a cost-effective way to replenish bearing assemblies without ordering minimum-quantity bulk lots.\u003c\/p\u003e\n\u003cp\u003eEach ball is manufactured from GCr15 bearing steel (equivalent to AISI 52100 \/ SUJ2), a high-carbon chromium alloy widely used in precision bearing production. The balls are ground and lapped to tight sphericity tolerances, with a hardened surface finish that resists wear under radial and axial load. Diameters span 3mm through 10.5mm, covering both metric and inch-fraction sizes (e.g., 3.175mm = 1\/8\", 4.763mm = 3\/16\", 6.35mm = 1\/4\", 7.938mm = 5\/16\", 9.525mm = 3\/8\").\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing balls in deep-groove radial bearings for electric motors and power tools, restoring ball screws and linear guides in CNC equipment, and servicing bicycle hubs, skateboard bearings, and small appliance assemblies where standard replacement balls are difficult to source locally.\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 standard deep-groove ball bearing housings, ball screws, linear guides, and open bearing assemblies. Match the diameter precisely to your existing bearing specification before ordering. Mixed metric and inch-fraction sizes available — see variant options.\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\u003cstrong\u003eGCr15 \/ AISI 52100 Bearing Steel:\u003c\/strong\u003e High-carbon chromium alloy delivers the hardness and fatigue resistance required for cyclic load applications in motors, drives, and precision instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26 Diameter Options (3mm–10.5mm):\u003c\/strong\u003e Covers the most common metric and inch-fraction replacement sizes in a single product listing — select the exact diameter your bearing assembly requires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround \u0026amp; Lapped Sphericity:\u003c\/strong\u003e Balls are precision-ground to minimize runout and vibration, maintaining consistent contact geometry across the full bearing raceway.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardened Surface Finish:\u003c\/strong\u003e Through-hardened construction resists surface fatigue, pitting, and deformation under sustained radial and axial loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1kg Pack Quantity:\u003c\/strong\u003e Sold by weight rather than arbitrary piece counts — practical for maintenance shops and repair technicians who need a working stock of replacement balls on hand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Treatment:\u003c\/strong\u003e Surface finish provides baseline protection against oxidation during storage and light-duty wet environments; apply bearing grease for extended service life.\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 bearing steel (AISI 52100 \/ SUJ2 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e3mm – 10.5mm (approx. 0.118\" – 0.413\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e3, 3.175, 3.5, 3.969, 4, 4.5, 4.763, 5, 5.556, 5.953, 6, 6.25, 6.35, 6.5, 6.747, 7, 7.144, 7.5, 7.938, 8, 8.5, 8.731, 9, 9.525, 10, 10.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 kg per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround and lapped\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSphericity Grade\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\u003eDeep-groove bearings, ball screws, linear guides, instrument bearings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSurface-treated; recommend grease for wet 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\u003eRemove one ball from the existing bearing and measure its diameter with a micrometer or digital caliper. Match that measurement to the closest available size in the variant list. For inch-fraction bearings, note that 3.175mm = 1\/8\", 4.763mm = 3\/16\", 6.35mm = 1\/4\", 7.938mm = 5\/16\", and 9.525mm = 3\/8\". Even a 0.1mm mismatch can cause excessive play or binding, so measure before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is GCr15 steel and how does it compare to standard steel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 is a high-carbon chromium bearing steel equivalent to AISI 52100 (US) and SUJ2 (Japan). It contains approximately 1% carbon and 1.5% chromium, which allows it to be hardened to 60–66 HRC. This makes it significantly harder and more fatigue-resistant than general-purpose carbon steels, which is why it is the industry standard material for precision bearing balls in motors, gearboxes, and machine tools.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls suitable for corrosive or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 steel provides moderate corrosion resistance through its surface finish, but it is not stainless steel. For applications exposed to water, cutting fluids, or outdoor conditions, apply a compatible bearing grease or oil to the balls and housing. For highly corrosive environments, consider stainless steel bearing balls (AISI 440C) instead. These GCr15 balls are best suited for dry or lightly 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 sealed or shielded bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are loose replacement balls intended for open bearings or assemblies where the balls are accessible for replacement. Sealed (2RS) and shielded (ZZ) bearings are typically replaced as complete units rather than by individual balls. If your bearing is open or has a removable retainer, these balls are suitable — confirm the ball count and diameter match your original specification.\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 piece count per kilogram varies by diameter. As a rough guide: 3mm balls yield approximately 4,700–5,000 pieces per kg, while 10mm balls yield approximately 130–150 pieces per kg. If you need a specific piece count for a project, contact us with your diameter and required quantity and we can advise on the appropriate pack size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load types are these balls rated for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 bearing balls are designed to handle both radial (perpendicular to shaft) and axial (along shaft) loads when used in the correct bearing housing. The actual load rating depends on the bearing design, housing geometry, and number of balls — not the balls alone. For specific load calculations, refer to your bearing manufacturer's engineering data using the ball diameter and bearing series as inputs. These balls are replacement-grade and meet the hardness and sphericity requirements for standard precision bearing service.\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":"3mm \/ 1kg","offer_id":52409676955922,"sku":"LFL2024GANGZHU4224x1","price":78.51,"currency_code":"USD","in_stock":true},{"title":"3.175mm \/ 1kg","offer_id":52409676988690,"sku":"LFL2024GANGZHU4225x1","price":77.4,"currency_code":"USD","in_stock":true},{"title":"3.5mm \/ 1kg","offer_id":52409677021458,"sku":"LFL2024GANGZHU4226x1","price":75.78,"currency_code":"USD","in_stock":true},{"title":"3.969mm \/ 1kg","offer_id":52409677054226,"sku":"LFL2024GANGZHU4227x1","price":74.11,"currency_code":"USD","in_stock":true},{"title":"4mm \/ 1kg","offer_id":52409677086994,"sku":"LFL2024GANGZHU4228x1","price":72.99,"currency_code":"USD","in_stock":true},{"title":"4.5mm \/ 1kg","offer_id":52409677119762,"sku":"LFL2024GANGZHU4229x1","price":72.39,"currency_code":"USD","in_stock":true},{"title":"4.763mm \/ 1kg","offer_id":52409677152530,"sku":"LFL2024GANGZHU4230x1","price":72.39,"currency_code":"USD","in_stock":true},{"title":"5mm \/ 1kg","offer_id":52409677185298,"sku":"LFL2024GANGZHU4231x1","price":71.9,"currency_code":"USD","in_stock":true},{"title":"5.556mm \/ 1kg","offer_id":52409677218066,"sku":"LFL2024GANGZHU4232x1","price":71.37,"currency_code":"USD","in_stock":true},{"title":"5.953mm \/ 1kg","offer_id":52409677250834,"sku":"LFL2024GANGZHU4233x1","price":70.79,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 1kg","offer_id":52409677283602,"sku":"LFL2024GANGZHU4234x1","price":70.19,"currency_code":"USD","in_stock":true},{"title":"6.25mm \/ 1kg","offer_id":52409677316370,"sku":"LFL2024GANGZHU4235x1","price":71.9,"currency_code":"USD","in_stock":true},{"title":"6.35mm \/ 1kg","offer_id":52409677349138,"sku":"LFL2024GANGZHU4236x1","price":69.7,"currency_code":"USD","in_stock":true},{"title":"6.5mm \/ 1kg","offer_id":52409677381906,"sku":"LFL2024GANGZHU4237x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"6.747mm \/ 1kg","offer_id":52409677414674,"sku":"LFL2024GANGZHU4238x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"7mm \/ 1kg","offer_id":52409677447442,"sku":"LFL2024GANGZHU4239x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"7.144mm \/ 1kg","offer_id":52409677480210,"sku":"LFL2024GANGZHU4240x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"7.5mm \/ 1kg","offer_id":52409677512978,"sku":"LFL2024GANGZHU4241x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"7.938mm \/ 1kg","offer_id":52409677545746,"sku":"LFL2024GANGZHU4242x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1kg","offer_id":52409677578514,"sku":"LFL2024GANGZHU4243x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"8.5mm \/ 1kg","offer_id":52409677611282,"sku":"LFL2024GANGZHU4244x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"8.731mm \/ 1kg","offer_id":52409677644050,"sku":"LFL2024GANGZHU4245x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"9mm \/ 1kg","offer_id":52409677676818,"sku":"LFL2024GANGZHU4246x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"9.525mm \/ 1kg","offer_id":52409677709586,"sku":"LFL2024GANGZHU4247x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 1kg","offer_id":52409677742354,"sku":"LFL2024GANGZHU4248x1","price":67.5,"currency_code":"USD","in_stock":true},{"title":"10.5mm \/ 1kg","offer_id":52409677775122,"sku":"LFL2024GANGZHU4249x1","price":68.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of6_177f0d27-1a8b-43b9-9f09-dd7369e49d3a.jpg?v=1782191889","url":"https:\/\/homediyer.com\/de\/products\/1kg-precision-gcr15-steel-ball-bearing-replacement-bearings-size-3mm-10-5mm","provider":"HomeDIYer","version":"1.0","type":"link"}