{"product_id":"304-stainless-steel-ball-bearings-27mm-80mm-solid-round-ball-large-metal-balls","title":"304 Stainless Steel Ball Bearings 27mm-80mm Solid Round Ball Large Metal Balls","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e304 Stainless Steel Ball Bearings — Solid Round Balls for Industrial and DIY Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a loose ball bearing in a valve seat, pump housing, or custom jig fails mid-project, the entire assembly stops. Engineers, machinists, and hands-on builders who need a reliable replacement or a precision rolling element for a new build require a ball that holds tight tolerances and resists corrosion without constant maintenance. These 304 stainless steel ball bearings deliver exactly that.\u003c\/p\u003e\n\u003cp\u003eEach ball is machined from 304-grade stainless steel — an austenitic alloy known for its balanced strength and corrosion resistance — and ground to a smooth, consistent spherical surface. Available in 25 diameters ranging from 27 mm (approximately 1.06 in) to 80 mm (approximately 3.15 in), including fractional inch equivalents such as 31.75 mm (1-1\/4 in), 38.1 mm (1-1\/2 in), 50.8 mm (2 in), 63.5 mm (2-1\/2 in), and 76.2 mm (3 in), making them compatible with both metric and imperial tooling.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacement balls in check valves and ball valves for fluid control systems, rolling elements in custom linear slides and low-load bearing assemblies, decorative or functional hardware accents in furniture and architectural metalwork, and precision gauge balls for dimensional inspection fixtures.\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 metric and imperial applications. Verify bore or seat diameter before ordering. Diameter tolerance and surface finish vary by size — contact us to confirm if your application requires G10 or tighter grade.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 304 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\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Austenitic 18\/8 alloy provides solid corrosion resistance in humid, wet, and mildly acidic environments without surface coating that can chip or flake.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range: 27–80 mm\u003c\/strong\u003e — 25 size options in a single listing, covering both standard metric steps and fractional inch equivalents (1-1\/4\", 1-1\/2\", 2\", 2-1\/2\", 3\"), reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eSolid Round Ball Profile\u003c\/strong\u003e — Full solid cross-section (not hollow) ensures consistent load distribution and eliminates the risk of collapse under compressive or impact loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eSmooth Ground Surface\u003c\/strong\u003e — Precision-ground exterior supports low-friction rolling in valve seats, check valves, and light bearing races where surface irregularities cause premature wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eMetric and Imperial Compatibility\u003c\/strong\u003e — Fractional inch sizes (31.75 mm, 38.1 mm, 50.8 mm, 63.5 mm, 76.2 mm) are machined to exact inch equivalents, fitting standard imperial seats without modification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSingle-Piece Ordering\u003c\/strong\u003e — Each variant is sold per piece (1 Pcs), so you order exactly the quantity you need — no forced bulk packs for a one-off repair or prototype build.\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 Solid Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (18\/8 Austenitic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Type\u003c\/th\u003e\n\u003ctd\u003eSolid Round Ball\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e27 mm – 80 mm (approx. 1.06 in – 3.15 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e27, 28, 29, 30, 31.75, 32, 34, 35, 36, 38.1, 39, 40, 42, 45, 48, 50, 50.8, 55, 60, 63.5, 65, 70, 75, 76.2, 80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003ePrecision ground, smooth spherical surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSuitable for humid, wet, and mildly corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Piece (per variant)\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\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade \/ Tolerance\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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 bore or seat diameter of your housing with calipers before ordering. The ball should match the seat diameter precisely — a ball that is too small will leak or rattle, while one that is too large will not seat correctly. If your seat is specified in inches, use the fractional equivalents listed (e.g., 1-1\/2\" = 38.1 mm, 2\" = 50.8 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 mechanical assemblies?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel has a tensile strength of approximately 515 MPa (75,000 psi) and is suitable for light-to-medium load applications such as check valves, ball valves, and low-speed rolling elements. For high-load or high-speed precision bearing races, a hardened chrome steel (52100) or ceramic ball is typically recommended. 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 outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel forms a passive chromium oxide layer that resists rust in most humid and wet conditions. It performs well in freshwater and mild chemical exposure. However, it is not fully resistant to chloride-rich environments (e.g., saltwater or chlorinated pools) — for those applications, 316 stainless steel is a better choice. Contact us if you need a 316-grade option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the fractional inch sizes (31.75 mm, 38.1 mm, etc.) machined to exact inch dimensions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Sizes listed as fractional equivalents — 31.75 mm (1-1\/4\"), 38.1 mm (1-1\/2\"), 50.8 mm (2\"), 63.5 mm (2-1\/2\"), and 76.2 mm (3\") — are machined to those exact inch-derived dimensions. They are designed to fit standard imperial valve seats and housings without modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in food-grade or sanitary plumbing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel is widely used in food processing and sanitary plumbing equipment. However, confirm that your specific application's regulatory requirements (e.g., NSF, FDA, 3-A Sanitary Standards) are met before installation, as certification depends on the full assembly, not just the ball material. Contact us to confirm if you need documentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the surface finish, and does it affect rolling performance?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are precision ground to a smooth spherical surface. The ground finish reduces friction and surface irregularities that cause uneven wear in valve seats and light rolling applications. If your application requires a specific surface roughness (Ra value) or grade classification (e.g., G25, G10), contact us to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo you sell these in bulk quantities beyond 1 piece?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach variant is currently listed as 1 piece per order. If you need larger quantities for a production run or maintenance stock, contact us directly — bulk pricing may be available depending on the diameter and quantity required.\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":"27mm \/ 1Pcs","offer_id":52409849413906,"sku":"GYYKJSSYX0044x1","price":4.39,"currency_code":"USD","in_stock":true},{"title":"28mm \/ 1Pcs","offer_id":52409849446674,"sku":"GYYKJSSYX0045x1","price":4.71,"currency_code":"USD","in_stock":true},{"title":"29mm \/ 1Pcs","offer_id":52409849479442,"sku":"GYYKJSSYX0046x1","price":5.07,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 1Pcs","offer_id":52409849512210,"sku":"GYYKJSSYX0047x1","price":5.48,"currency_code":"USD","in_stock":true},{"title":"31.75mm \/ 1Pcs","offer_id":52409849544978,"sku":"GYYKJSSYX0048x1","price":6.65,"currency_code":"USD","in_stock":true},{"title":"32mm \/ 1Pcs","offer_id":52409849577746,"sku":"GYYKJSSYX0049x1","price":6.75,"currency_code":"USD","in_stock":true},{"title":"34mm \/ 1Pcs","offer_id":52409849610514,"sku":"GYYKJSSYX0050x1","price":8.61,"currency_code":"USD","in_stock":true},{"title":"35mm \/ 1Pcs","offer_id":52409849643282,"sku":"GYYKJSSYX0051x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"36mm \/ 1Pcs","offer_id":52409849676050,"sku":"GYYKJSSYX0052x1","price":9.76,"currency_code":"USD","in_stock":true},{"title":"38.1mm \/ 1Pcs","offer_id":52409849708818,"sku":"GYYKJSSYX0053x1","price":11.33,"currency_code":"USD","in_stock":true},{"title":"39mm \/ 1Pcs","offer_id":52409849741586,"sku":"GYYKJSSYX0054x1","price":12.62,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 1Pcs","offer_id":52409849774354,"sku":"GYYKJSSYX0055x1","price":13.44,"currency_code":"USD","in_stock":true},{"title":"42mm \/ 1Pcs","offer_id":52409849807122,"sku":"GYYKJSSYX0056x1","price":15.71,"currency_code":"USD","in_stock":true},{"title":"45mm \/ 1Pcs","offer_id":52409849839890,"sku":"GYYKJSSYX0057x1","price":18.54,"currency_code":"USD","in_stock":true},{"title":"48mm \/ 1Pcs","offer_id":52409849872658,"sku":"GYYKJSSYX0058x1","price":21.94,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 1Pcs","offer_id":52409849905426,"sku":"GYYKJSSYX0059x1","price":24.97,"currency_code":"USD","in_stock":true},{"title":"50.8mm \/ 1Pcs","offer_id":52409849938194,"sku":"GYYKJSSYX0060x1","price":26.23,"currency_code":"USD","in_stock":true},{"title":"55mm \/ 1Pcs","offer_id":52409849970962,"sku":"GYYKJSSYX0061x1","price":32.57,"currency_code":"USD","in_stock":true},{"title":"60mm \/ 1Pcs","offer_id":52409850003730,"sku":"GYYKJSSYX0062x1","price":41.11,"currency_code":"USD","in_stock":true},{"title":"63.5mm \/ 1Pcs","offer_id":52409850036498,"sku":"GYYKJSSYX0063x1","price":48.54,"currency_code":"USD","in_stock":true},{"title":"65mm \/ 1Pcs","offer_id":52409850069266,"sku":"GYYKJSSYX0064x1","price":56.28,"currency_code":"USD","in_stock":true},{"title":"70mm \/ 1Pcs","offer_id":52409850102034,"sku":"GYYKJSSYX0065x1","price":71.17,"currency_code":"USD","in_stock":true},{"title":"75mm \/ 1Pcs","offer_id":52409850134802,"sku":"GYYKJSSYX0066x1","price":90.07,"currency_code":"USD","in_stock":true},{"title":"76.2mm \/ 1Pcs","offer_id":52409850167570,"sku":"GYYKJSSYX0067x1","price":93.84,"currency_code":"USD","in_stock":true},{"title":"80mm \/ 1Pcs","offer_id":52409850200338,"sku":"GYYKJSSYX0068x1","price":107.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture7of9_7f0d19d9-ad32-4bf5-a709-4a0a8cc75b3c.jpg?v=1782345256","url":"https:\/\/homediyer.com\/products\/304-stainless-steel-ball-bearings-27mm-80mm-solid-round-ball-large-metal-balls","provider":"HomeDIYer","version":"1.0","type":"link"}