{"product_id":"440c-stainless-steel-ball-bearings-g5-grade-15-60mm-high-precision","title":"440C Stainless Steel Ball Bearings G5 Grade 15mm - 60mm High Precision Bearing","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e440C Stainless Steel Ball Bearings — G5 Precision for Demanding DIY Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or corroded bearing brings your project to a halt, finding an exact-fit replacement that won't fail again is the real challenge. Whether you're a maker rebuilding a skateboard, a technician servicing a pump, or an engineer sourcing precision components, these 440C stainless steel ball bearings deliver the dimensional accuracy and corrosion resistance your application demands.\u003c\/p\u003e\n\u003cp\u003eEach bearing is manufactured from 440C martensitic stainless steel — one of the hardest stainless alloys available — and ground to G5 ABEC grade tolerances. Available diameters span 15.081 mm (~0.594\") through 60 mm (~2.362\"), covering both metric and inch-series sizes. The smooth, mirror-polished ball surface minimizes rolling friction and extends service life under load.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing worn balls in deep-groove radial bearings for electric motors and fans, restoring smooth action in linear slides and drawer mechanisms, and sourcing precision balls for custom jigs, fixtures, and robotic joints where tight tolerances are non-negotiable.\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 deep-groove ball bearing races, linear guides, and custom housings accepting balls from 15 mm to 60 mm diameter. Verify your race's ball complement diameter before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 440C Stainless 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\u003eG5 ABEC Grade Precision\u003c\/strong\u003e — Ground to tight sphericity and diameter tolerances, ensuring smooth, low-vibration rolling in high-speed and precision assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦾\u003c\/span\u003e\u003cstrong\u003e440C Stainless Steel Construction\u003c\/strong\u003e — Martensitic stainless alloy with high hardness (typically 58–62 HRC after heat treatment) for excellent wear resistance under radial and thrust loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface\u003c\/strong\u003e — 440C's chromium content provides solid resistance to moisture, mild acids, and atmospheric corrosion — suitable for wet or humid environments where carbon steel balls would rust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range (15–60 mm)\u003c\/strong\u003e — 35 size options covering both metric standards and inch-series equivalents (e.g., 15.875 mm = 5\/8\", 25.4 mm = 1\", 50.8 mm = 2\"), reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cstrong\u003eMirror-Polished Ball Surface\u003c\/strong\u003e — Smooth finish reduces friction, minimizes race wear, and supports quiet operation in noise-sensitive applications such as fans, instruments, and medical devices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect Drop-In Replacement\u003c\/strong\u003e — Dimensionally matched to ISO and ANSI ball standards, making these a straightforward replacement for failed balls in existing bearing assemblies without machining or modification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e440C Martensitic Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eG5 (ABEC \/ ISO 3290)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e15.081 mm – 60 mm (approx. 0.594\" – 2.362\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMirror-polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eTypically 58–62 HRC (after heat treatment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for humid and mildly corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically –20°C to +150°C (–4°F to +302°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandards Compliance\u003c\/th\u003e\n\u003ctd\u003eISO 3290 G5 \/ ABEC Grade 5\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 correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the diameter of the existing balls in your bearing using a micrometer or digital caliper. Match that measurement to the closest available size in the variant selector. For inch-series bearings, note that common fractional sizes are included: 15.875 mm (5\/8\"), 19.05 mm (3\/4\"), 25.4 mm (1\"), 31.75 mm (1-1\/4\"), 38.1 mm (1-1\/2\"), and 50.8 mm (2\"). If your measurement falls between two listed sizes, always select the smaller size and confirm against your bearing manufacturer's specification sheet.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can these G5 stainless steel balls handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLoad capacity depends on the full bearing assembly — the race geometry, number of balls, and housing — not the ball alone. However, 440C stainless steel at G5 grade provides high hardness (typically 58–62 HRC) and good fatigue resistance, making these balls suitable for moderate-to-heavy radial and thrust loads in standard bearing configurations. For critical load calculations, consult your bearing manufacturer's dynamic and static load ratings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls suitable for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 440C stainless steel offers good corrosion resistance against moisture, rain, and mild atmospheric exposure, making it a reliable choice for outdoor equipment, marine-adjacent applications, and food-processing machinery where occasional water contact occurs. For highly aggressive chemical environments (strong acids, chlorinated water, or saltwater immersion), consider 316 stainless or ceramic alternatives, as 440C can pit under prolonged exposure to chlorides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between G5 and G10 or G25 grade balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGrade numbers in ISO 3290 refer to the maximum allowable deviation in sphericity and diameter variation — a lower number means tighter tolerances. G5 balls have a maximum spherical deviation of 0.13 µm, making them suitable for precision instruments, high-speed spindles, and low-noise applications. G10 and G25 grades have progressively looser tolerances and are typically used in general-purpose or lower-speed bearings. For most DIY repair and replacement tasks, G5 provides more than adequate precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls to replace just the rolling elements in an existing bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, that is the primary use case. If your bearing races are undamaged but the balls show pitting, flat spots, or corrosion, replacing only the ball complement is a cost-effective repair. Carefully disassemble the bearing, clean the races, inspect for race damage, and install the new balls with a light application of appropriate bearing grease before reassembly. Ensure the replacement ball diameter exactly matches the original specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls compatible with both metric and imperial bearing standards?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The size range includes both metric diameters (e.g., 15 mm, 16 mm, 20 mm, 25 mm, 30 mm) and inch-series equivalents expressed in millimeters (e.g., 15.875 mm = 5\/8\", 22.225 mm = 7\/8\", 25.4 mm = 1\"). This makes them compatible with bearings manufactured to both ISO metric and ANSI\/ABMA inch standards. Always verify the exact ball diameter from your bearing's datasheet rather than relying on nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store unused stainless steel balls to prevent surface damage?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStore balls in a clean, dry environment away from ferrous metal chips or abrasive particles that could scratch the polished surface. Keep them in their original packaging or a sealed container with a light coating of clean machine oil or VCI (vapor corrosion inhibitor) paper. Avoid stacking heavy objects on top of stored balls, as point-contact pressure can cause brinelling (small indentations) on the polished surface over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"15.081mm \/ 1","offer_id":52410801848594,"sku":"GLFBLFFSYXGZ00105x1","price":8.39,"currency_code":"USD","in_stock":true},{"title":"15.875mm \/ 1","offer_id":52410801881362,"sku":"GLFBLFFSYXGZ00106x1","price":8.85,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 1","offer_id":52410801914130,"sku":"GLFBLFFSYXGZ00107x1","price":8.85,"currency_code":"USD","in_stock":true},{"title":"16.669mm \/ 1","offer_id":52410801946898,"sku":"GLFBLFFSYXGZ00108x1","price":9.34,"currency_code":"USD","in_stock":true},{"title":"17.462mm \/ 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