{"product_id":"440c-stainless-steel-precision-balls-g10-bearings","title":"440C Stainless Steel Ball 0.4mm-38.1mm Precision G10 Bearings Smooth Solid Balls","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e440C Stainless Steel Precision Balls — Corrosion-Resistant G10 Solid Balls for Bearings \u0026amp; Valves\u003c\/h2\u003e\n\u003cp\u003eWhen a single undersized or rough-surfaced ball causes bearing failure, valve leakage, or measurement error, the cost of downtime far outweighs the cost of the part. Engineers, machinists, and serious DIYers who need dimensionally consistent, corrosion-resistant balls in exact diameters — from micro 0.4 mm to large 38.1 mm — need a reliable source they can order from in any quantity.\u003c\/p\u003e\n\u003cp\u003eThese 440C stainless steel precision balls are manufactured to G10 grade tolerances, meaning diameter variation is held to ±0.000025\" (0.000635 mm) or better. The material is 440C martensitic stainless steel — a high-carbon, chromium-bearing alloy that delivers a hardness of approximately 58–62 HRC after heat treatment. Available diameters span 0.4 mm (0.016\") through 31.75 mm (1.25\"), with pack sizes from a single piece up to 1,000 pieces to suit prototyping through production runs.\u003c\/p\u003e\n\u003cp\u003eTypical applications include radial and angular-contact ball bearings, check valves and ball valves, precision gauging and calibration fixtures, linear motion guides, pump components, and decorative or functional metalworking projects requiring a polished stainless sphere.\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 bearing races, valve seats, and gauge fixtures designed for the corresponding ball diameter. Verify seat geometry and tolerance class before use in precision assemblies.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 440C Stainless Steel Precision Balls\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eG10 Grade Precision\u003c\/strong\u003e\n\u003cp\u003eDiameter tolerance held to ±0.000025\" (0.635 µm), ensuring consistent fit in bearing races, valve seats, and gauging fixtures without selective assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003e440C Stainless Steel Alloy\u003c\/strong\u003e\n\u003cp\u003eHigh-carbon, high-chromium martensitic stainless steel with approximately 58–62 HRC hardness after heat treatment — resistant to wear, fatigue, and moderate corrosion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e \u003cstrong\u003eCorrosion Resistance\u003c\/strong\u003e\n\u003cp\u003eThe chromium content forms a passive oxide layer that resists rust in humid, mildly acidic, and salt-spray environments, extending service life in exposed assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e\n\u003cp\u003e20 distinct diameters from 0.4 mm (0.016\") to 31.75 mm (1.25\"), covering metric, fractional-inch, and wire-gauge sizes for both standard and custom applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Sizes\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, 5, 10, 20, 50, 100, 500, or 1,000 pieces — scale from a single replacement ball to a full production batch without minimum-order constraints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e \u003cstrong\u003eSmooth Polished Surface\u003c\/strong\u003e\n\u003cp\u003eBright-polished finish reduces friction and noise in rolling-element assemblies, and provides an aesthetically clean surface for decorative metalwork and display pieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 440C Stainless Steel Precision Balls\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\u003eG10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e0.4 mm – 31.75 mm (0.016\" – 1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e0.4, 2, 2.5, 3, 4, 5, 6, 6.35, 7.144, 7.938, 8.731, 10, 11.1125, 12, 12.7, 14, 15.875, 20, 25, 31.75 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Tolerance (G10)\u003c\/th\u003e\n\u003ctd\u003e±0.000025\" (±0.635 µm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBright polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (approx.)\u003c\/th\u003e\n\u003ctd\u003e58–62 HRC (after heat treatment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChromium Content\u003c\/th\u003e\n\u003ctd\u003e16–18%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCarbon Content\u003c\/th\u003e\n\u003ctd\u003e0.95–1.20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Sizes Available\u003c\/th\u003e\n\u003ctd\u003e1, 2, 5, 10, 20, 50, 100, 500, 1000 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Unit\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnetism\u003c\/th\u003e\n\u003ctd\u003eSlightly magnetic (martensitic grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTemperature Range\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 choose the right diameter for my bearing or valve?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the ball diameter to the bore specification of your bearing race or valve seat. For standard bearings, the ball diameter is listed in the bearing's datasheet (e.g., 6mm balls for a 6001 bearing). For valve seats, measure the seat bore with a caliper and select the closest listed diameter. When in doubt, contact us to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G10 grade mean, and is it accurate enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG10 is an ABMA\/ISO precision grade indicating a diameter tolerance of ±0.000025\" (0.635 µm) and a sphericity deviation of no more than 0.000025\". This is suitable for most industrial bearings, check valves, and precision gauging. Applications requiring tighter tolerances (G5 or G3) should specify accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these balls — will they crack under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e440C stainless steel achieves approximately 58–62 HRC hardness after heat treatment, giving it excellent compressive strength and fatigue resistance. These balls are used in rolling-element bearings that routinely handle thousands of pounds of dynamic load. Avoid impact loading or use in applications exceeding the rated dynamic capacity of the bearing assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls truly corrosion-resistant, or will they rust?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e440C stainless steel forms a passive chromium-oxide layer that resists rust in humid air, mild acids, and salt-spray environments. However, it is not fully immune to corrosion in chloride-rich or strongly acidic environments. For marine or chemical-process applications, consider 316 stainless or ceramic alternatives. For most workshop, automotive, and general industrial use, 440C performs reliably.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in food-contact or medical applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e440C stainless steel is used in some food-processing and medical equipment, but regulatory compliance depends on your specific application and jurisdiction. These balls are not supplied with FDA or medical-device certifications. If compliance documentation is required, please contact us before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the pack sizes, and can I mix diameters in one order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach variant is a specific combination of diameter and pack size — for example, 6 mm × 100 Pcs or 10 mm × 10 Pcs. You can add multiple variants to your cart to mix diameters and quantities in a single order. Larger pack sizes offer a lower per-piece cost, making them economical for production runs or stocking spare parts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls magnetic?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, 440C is a martensitic stainless steel and is slightly magnetic after heat treatment. If your application requires non-magnetic balls (e.g., near sensitive electronics or MRI-adjacent equipment), consider austenitic stainless (316) or ceramic (Si3N4) alternatives.\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 pack size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"0.4mm \/ 100 Pcs","offer_id":52410564706578,"sku":"GYWWWJSSYX0803x100","price":5.21,"currency_code":"USD","in_stock":true},{"title":"2mm \/ 100 Pcs","offer_id":52410564739346,"sku":"GYWWWJSSYX0805x100","price":5.21,"currency_code":"USD","in_stock":true},{"title":"2.5mm \/ 100 Pcs","offer_id":52410564772114,"sku":"GYWWWJSSYX0806x100","price":5.21,"currency_code":"USD","in_stock":true},{"title":"3mm \/ 100 Pcs","offer_id":52410564804882,"sku":"GYWWWJSSYX0807x100","price":5.21,"currency_code":"USD","in_stock":true},{"title":"4mm \/ 100 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