{"product_id":"304-stainless-steel-precision-balls-3mm-20mm-1kg","title":"1KG Solid 304 Stainless Steel Ball Precision Replacement Bearings 3mm - 20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e304 Stainless Steel Precision Balls — Corrosion-Resistant Replacement Bearings, 3mm to 20mm\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or corroded bearing ball causes vibration, noise, or premature failure in a mechanism, finding a dimensionally accurate replacement quickly matters. Engineers, maintenance technicians, and hands-on DIYers who work with pumps, valves, drawer slides, casters, or precision instruments need balls that hold tight tolerances without rusting in humid or wet environments.\u003c\/p\u003e\n\u003cp\u003eThese solid 304 stainless steel precision balls are supplied in a 1 kg pack and are available in diameters from 3 mm (approx. 0.118 in) to 20 mm (approx. 0.787 in), covering both metric and common fractional sizes such as 4.763 mm (3\/16 in), 6.35 mm (1\/4 in), 7.938 mm (5\/16 in), 9.525 mm (3\/8 in), and 12.7 mm (1\/2 in). Each ball is manufactured from 304 stainless steel, offering a good balance of corrosion resistance, hardness, and machinability.\u003c\/p\u003e\n\u003cp\u003eTypical applications include replacing worn balls in ball-check valves and flow-control assemblies, restocking bearing races in light-duty drawer slides and furniture hardware, and serving as precision media in ball-screw mechanisms or small pneumatic actuators. The 1 kg bulk format suits workshop stock, small-batch production runs, and maintenance kits where multiple sizes are consumed regularly.\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 Note:\u003c\/strong\u003e Select the diameter that matches your existing bearing race or seat. Fractional-inch sizes (3\/16\", 1\/4\", 5\/16\", 3\/8\", 1\/2\") are listed in their metric equivalents. If your application requires Grade 100 or tighter tolerances, contact us to confirm suitability before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 304 Stainless Steel Precision Balls\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and oxidation in damp, humid, or mildly corrosive environments, making these balls suitable for indoor plumbing, food-adjacent equipment, and marine-adjacent applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e — Available from 3 mm to 20 mm in 24 size options, including both standard metric steps and fractional-inch equivalents (4.763 mm, 6.35 mm, 7.938 mm, 9.525 mm, 12.7 mm), reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003e1 kg Bulk Pack\u003c\/strong\u003e — Sold by weight rather than individual count, providing a practical quantity for workshop stock, maintenance kits, or small production runs without over-ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eSolid Ball Construction\u003c\/strong\u003e — Fully solid cross-section (not hollow) ensures consistent load distribution and dimensional stability under compression in bearing races, check valves, and ball-screw seats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect Replacement Fit\u003c\/strong\u003e — Sized to match standard bearing-race dimensions; verify the diameter against your existing ball or seat specification before ordering to ensure a drop-in fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suitable for ball-check valves, drawer-slide hardware, caster assemblies, pneumatic actuators, and light-duty precision instruments where stainless steel is preferred over carbon steel.\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 Precision Balls\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Construction\u003c\/th\u003e\n\u003ctd\u003eSolid (not hollow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e3 mm – 20 mm (approx. 0.118 in – 0.787 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e3, 4, 4.763, 5, 6, 6.35, 7, 7.938, 8, 8.5, 9, 9.525, 10, 11, 12, 12.7, 13, 14, 15, 16, 17, 18, 19, 20 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\u003eSurface Finish\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\u003eTolerance Grade\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSuitable for humid and mildly corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eBall-check valves, bearing races, drawer slides, casters, pneumatic actuators\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 application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the diameter of the existing ball using a micrometer or digital caliper, or check the bearing race specification in your equipment's service manual. Match that measurement to the closest available size in the variant selector. For fractional-inch applications, use the metric equivalents listed: 3\/16\" = 4.763 mm, 1\/4\" = 6.35 mm, 5\/16\" = 7.938 mm, 3\/8\" = 9.525 mm, 1\/2\" = 12.7 mm.\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\u003e304 stainless steel has a tensile strength of approximately 515 MPa and a hardness of around 70–90 HRB, which is adequate for light-to-medium duty applications such as drawer slides, casters, check valves, and small pneumatic actuators. For heavy-load bearing races or high-cycle industrial machinery, a hardened chrome steel or 440C stainless ball may be more appropriate. Contact us if you need to confirm suitability for a specific load rating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these balls rust or corrode in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel provides good resistance to rust and oxidation in fresh water, humid air, and mildly corrosive environments. It is not fully immune to corrosion in chloride-rich environments such as salt water or strong chemical exposure. For highly corrosive conditions, 316 stainless steel balls would offer better resistance. For typical indoor plumbing, food-adjacent equipment, or general workshop use, 304 performs reliably.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard bearing races and check valves?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are sized to standard metric and fractional-inch dimensions used in common bearing races, ball-check valves, and drawer-slide hardware. Compatibility depends on the specific seat or race diameter in your assembly. Always verify the required ball diameter against your equipment specification before ordering. If you are unsure, contact us with your application details and we can advise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls are included in a 1 kg pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe quantity per pack varies by diameter because larger balls weigh more individually. As a general reference: a 1 kg pack of 3 mm balls contains significantly more pieces than a 1 kg pack of 20 mm balls. If you need an estimated piece count for a specific diameter, contact us and we can provide an approximate figure based on the density of 304 stainless steel (approx. 7.93 g\/cm³).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in food-processing or medical equipment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel is widely used in food-processing equipment and is generally considered food-safe for incidental contact applications. However, if your application requires certified food-grade or medical-grade components with specific documentation (such as material certifications or FDA compliance letters), please contact us before ordering to confirm whether certification documents are available for this product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between these and chrome steel bearing balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eChrome steel (52100) bearing balls are harder (typically 60–65 HRC) and better suited for high-load, high-cycle precision bearing applications. 304 stainless steel balls are softer but offer superior corrosion resistance, making them the preferred choice when the operating environment involves moisture, mild chemicals, or where rust contamination is a concern. Choose stainless for corrosion resistance; choose chrome steel for maximum hardness and load capacity.\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":52409677807890,"sku":"LFL2024GANGZHU5142x1","price":42.73,"currency_code":"USD","in_stock":true},{"title":"4mm \/ 1kg","offer_id":52409677840658,"sku":"LFL2024GANGZHU5143x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"4.763mm \/ 1kg","offer_id":52409677873426,"sku":"LFL2024GANGZHU5144x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"5mm \/ 1kg","offer_id":52409677906194,"sku":"LFL2024GANGZHU5145x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 1kg","offer_id":52409677938962,"sku":"LFL2024GANGZHU5146x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"6.35mm \/ 1kg","offer_id":52409677971730,"sku":"LFL2024GANGZHU5147x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"7mm \/ 1kg","offer_id":52409678004498,"sku":"LFL2024GANGZHU5148x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"7.938mm \/ 1kg","offer_id":52409678037266,"sku":"LFL2024GANGZHU5149x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1kg","offer_id":52409678070034,"sku":"LFL2024GANGZHU5150x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"8.5mm \/ 1kg","offer_id":52409678102802,"sku":"LFL2024GANGZHU5151x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"9mm \/ 1kg","offer_id":52409678135570,"sku":"LFL2024GANGZHU5152x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"9.525mm \/ 1kg","offer_id":52409678168338,"sku":"LFL2024GANGZHU5153x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 1kg","offer_id":52409678201106,"sku":"LFL2024GANGZHU5154x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"11mm \/ 1kg","offer_id":52409678233874,"sku":"LFL2024GANGZHU5155x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 1kg","offer_id":52409678266642,"sku":"LFL2024GANGZHU5156x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1kg","offer_id":52409678299410,"sku":"LFL2024GANGZHU5157x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"13mm \/ 1kg","offer_id":52409678332178,"sku":"LFL2024GANGZHU5158x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1kg","offer_id":52409678364946,"sku":"LFL2024GANGZHU5159x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"15mm \/ 1kg","offer_id":52409678397714,"sku":"LFL2024GANGZHU5160x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 1kg","offer_id":52409678430482,"sku":"LFL2024GANGZHU5161x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"17mm \/ 1kg","offer_id":52409678463250,"sku":"LFL2024GANGZHU5162x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"18mm \/ 1kg","offer_id":52409678496018,"sku":"LFL2024GANGZHU5163x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"19mm \/ 1kg","offer_id":52409678528786,"sku":"LFL2024GANGZHU5164x1","price":41.06,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 1kg","offer_id":52409678561554,"sku":"LFL2024GANGZHU5165x1","price":41.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of6_be187be3-f4ac-4631-94ee-47eca47147b3.jpg?v=1782192568","url":"https:\/\/homediyer.com\/de\/products\/304-stainless-steel-precision-balls-3mm-20mm-1kg","provider":"HomeDIYer","version":"1.0","type":"link"}