{"product_id":"iron-steel-ball-bearings-replacement-6-35mm-12mm","title":"Iron Ball Bearings Replacement Steel Ball Oil Free Smooth Bright 6.35mm-12mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eIron Steel Ball Bearings — Oil-Free Replacement Balls for Precision Rolling Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or corroded ball causes uneven load distribution, vibration, or premature bearing failure, finding a dimensionally accurate replacement matters. Machinists, maintenance technicians, and serious DIYers who need to restore bearing assemblies, linear slides, drawer runners, or ball-screw mechanisms to spec rely on consistent, tightly toleranced steel balls to get the job done right.\u003c\/p\u003e\n\u003cp\u003eThese iron steel ball bearings are manufactured from carbon steel and finished to a bright, smooth surface. Available in diameters from 6.35 mm (¼ in) to 12 mm (approximately 15\/32 in), each ball is sold by weight in 1 kg packs, giving you a practical quantity for both single-unit repairs and batch replacements. The oil-free surface finish means they are ready to install into dry-lube or grease-packed assemblies without pre-cleaning.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing rolling elements in deep-groove ball bearings, restoring ball-transfer units on conveyor tables, replenishing ball-screw or ball-spline assemblies in CNC equipment, and refilling ball-detent mechanisms in tooling fixtures. The consistent diameter across each pack supports even load sharing and smooth, low-noise operation after installation.\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 ball bearing housings, ball-transfer units, drawer slides, and ball-detent assemblies requiring carbon steel rolling elements in the 6.35–12 mm diameter range.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Iron Steel Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil-Free Surface Finish\u003c\/strong\u003e — Arrives clean and dry, ready to drop into grease-packed or dry-lube bearing assemblies without a degreasing step.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright Smooth Finish\u003c\/strong\u003e — Polished exterior reduces surface roughness, supporting low-friction rolling contact and quieter operation in precision assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e — Ten sizes from 6.35 mm to 12 mm (¼ in to ~15\/32 in) cover the most common replacement needs across bearing and slide applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by Weight (1 kg Pack)\u003c\/strong\u003e — Consistent pack weight lets you calculate exact quantities needed per assembly and keep spares on hand for future maintenance cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Provides the hardness and compressive strength required for load-bearing rolling contact in mechanical assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Application Fit\u003c\/strong\u003e — Suitable for deep-groove bearings, ball-transfer units, ball screws, drawer runners, and ball-detent tooling fixtures across industrial and workshop settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Iron Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel (iron-based)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBright, smooth, oil-free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e6.35 mm – 12 mm (¼ in – ~15\/32 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e6.35 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 11 mm, 12 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\u003eTolerance Grade\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eStandard carbon steel; recommend dry or grease-lubricated environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eBall bearings, ball-transfer units, ball screws, drawer slides, detent mechanisms\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 choose the right diameter for my bearing assembly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the existing balls with a micrometer or digital caliper before ordering. The ball diameter must match the bearing's internal geometry exactly — even a 0.5 mm deviation can cause uneven load distribution or prevent the retainer from seating correctly. If the original balls are worn, check the bearing manufacturer's datasheet for the specified ball diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls strong enough for load-bearing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Carbon steel balls provide the compressive strength and surface hardness needed for rolling contact under radial and axial loads in standard bearing assemblies. For applications involving very high impact loads or elevated temperatures, confirm the required hardness grade against your equipment specifications before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these balls rust? How should I protect them?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel is susceptible to oxidation in humid or wet environments. For dry indoor applications, the oil-free finish is sufficient. For environments with moisture exposure, apply a compatible bearing grease or anti-corrosion oil after installation. If corrosion resistance is a primary requirement, consider stainless steel balls instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in sealed or shielded bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are replacement rolling elements intended for open bearings or assemblies where the balls are accessible for replacement. Sealed and shielded bearings are typically not designed for field ball replacement — if the rolling elements in a sealed bearing are worn, replacing the entire bearing unit is usually the correct approach.\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 quantity per pack depends on the diameter selected. Smaller diameters (e.g., 6.35 mm) yield significantly more balls per kilogram than larger diameters (e.g., 12 mm). As a rough guide: a 1 kg pack of 6.35 mm balls contains approximately 1,800–2,000 pieces, while a 1 kg pack of 12 mm balls contains approximately 270–300 pieces. Exact counts vary slightly with manufacturing tolerances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with ball-screw and ball-spline assemblies?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBall screws and ball splines require balls with tight diameter tolerances and specific hardness grades. These carbon steel balls may be suitable for lower-precision or maintenance-grade ball-screw assemblies, but for precision CNC ball screws, verify the required tolerance grade (typically G10–G100) and hardness specification against your screw manufacturer's documentation before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between these and stainless steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel balls (like these) offer higher hardness and are generally more cost-effective for dry or grease-lubricated indoor applications. Stainless steel balls provide better corrosion resistance for wet, food-grade, or chemically exposed environments, but typically at a higher cost. Choose based on your operating environment and load requirements.\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":"6.35mm \/ 1kg","offer_id":52410415251730,"sku":"LFL2024GANGZHU4360x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"7mm \/ 1kg","offer_id":52410415284498,"sku":"LFL2024GANGZHU4361x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"7.5mm \/ 1kg","offer_id":52410415317266,"sku":"LFL2024GANGZHU4362x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1kg","offer_id":52410415350034,"sku":"LFL2024GANGZHU4363x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"8.5mm \/ 1kg","offer_id":52410415382802,"sku":"LFL2024GANGZHU4364x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"9mm \/ 1kg","offer_id":52410415415570,"sku":"LFL2024GANGZHU4365x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"9.5mm \/ 1kg","offer_id":52410415448338,"sku":"LFL2024GANGZHU4366x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 1kg","offer_id":52410415481106,"sku":"LFL2024GANGZHU4367x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"11mm \/ 1kg","offer_id":52410415513874,"sku":"LFL2024GANGZHU4368x1","price":93.27,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 1kg","offer_id":52410415546642,"sku":"LFL2024GANGZHU4369x1","price":93.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-04_86b8c274-ba84-4f21-bacb-efa32b962ebc.jpg?v=1782442108","url":"https:\/\/homediyer.com\/products\/iron-steel-ball-bearings-replacement-6-35mm-12mm","provider":"HomeDIYer","version":"1.0","type":"link"}