{"product_id":"304-stainless-steel-ball-bearings-slingshot-ammo-10-20mm","title":"10-20mm 304 Stainless Steel Ball Slingshot Ammo Ball Bearings Solid Steel Ball","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e304 Stainless Steel Ball Bearings — Precision Solid Balls for Slingshot Ammo \u0026amp; Mechanical Use\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized ball causes inconsistent shots, rattling assemblies, or premature wear in your equipment, the root issue is almost always material grade and dimensional accuracy. These 304 stainless steel ball bearings are sized from 10 mm (0.39 in) to 20 mm (0.79 in) and are designed for users who need repeatable performance — whether that's a hobbyist loading a slingshot or a technician replacing rolling elements in a light-duty bearing housing.\u003c\/p\u003e\n\u003cp\u003eEach ball is machined from 304-grade austenitic stainless steel, offering a chromium-nickel alloy composition that resists surface oxidation in humid and mildly corrosive environments. Diameter options span 10 mm through 20 mm in 1 mm increments, and packs are available in 2, 5, or 10 pieces to match your project scale without over-ordering.\u003c\/p\u003e\n\u003cp\u003eTypical applications include slingshot and wrist-rocket ammo where consistent mass and roundness affect trajectory, replacement rolling elements in drawer slides and light bearing races, marble-run and kinetic sculpture builds requiring uniform sphere diameter, and valve seat balls in low-pressure fluid systems where stainless compatibility is required.\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 Verify your housing bore or slingshot pouch diameter before ordering. Ball diameter tolerance is typically ±0.05 mm for this grade. For tight-tolerance precision bearings (Grade 10 or better), see our precision ball bearing listings.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 304 Stainless Steel Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Chromium-nickel alloy resists rust and surface corrosion in humid, outdoor, and mildly acidic environments without requiring a protective coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003e11 Diameter Options (10–20 mm)\u003c\/strong\u003e — Available in every 1 mm increment from 10 mm (0.39 in) to 20 mm (0.79 in), so you can match the exact bore or pouch size your project requires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eConsistent Mass for Slingshot Ammo\u003c\/strong\u003e — Uniform density (~7.9 g\/cm³ for 304 SS) means each ball in a pack delivers predictable trajectory and impact energy, reducing shot-to-shot variance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eSmooth Spherical Surface\u003c\/strong\u003e — Machined to a consistent roundness suitable for light-duty rolling contact, valve seats, and kinetic assemblies where surface finish affects function.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Sizes (2 \/ 5 \/ 10 pcs)\u003c\/strong\u003e — Order exactly what you need for a repair, a test run, or a full project batch without committing to bulk quantities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eNon-Magnetic 304 Grade\u003c\/strong\u003e — Austenitic stainless is largely non-magnetic, making these balls suitable for applications where magnetic interference must be minimized.\u003c\/li\u003e\n\u003c\/ul\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\u003e304 Stainless Steel (18-8 Chromium-Nickel Alloy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e10 mm – 20 mm (0.39 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Increment\u003c\/th\u003e\n\u003ctd\u003e1 mm steps (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically ±0.05 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSmooth machined sphere\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDensity\u003c\/th\u003e\n\u003ctd\u003e~7.9 g\/cm³ (typical for 304 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eTypically HRC 25–35 (304 SS annealed)\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\u003eMagnetic Properties\u003c\/th\u003e\n\u003ctd\u003eLargely non-magnetic (austenitic grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e2 pcs \/ 5 pcs \/ 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eSlingshot ammo, light bearing replacement, valve seats, kinetic builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Quantity\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 ball diameter for my slingshot?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your slingshot pouch opening or the fork gap width. A ball that is too small will slip through; one that is too large will not seat properly and can affect accuracy. Most standard slingshot pouches accommodate balls in the 10–14 mm range, while heavier hunting-style slings often use 15–20 mm. When in doubt, order a 2-piece pack of two adjacent sizes to test fit before committing to a larger quantity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls strong enough for repeated slingshot use?\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 typically in the HRC 25–35 range. For recreational slingshot use at standard band tensions, this is sufficient. However, if you are using very high-draw-weight bands or competition-grade setups, consider hardened steel or chrome steel balls, which offer higher surface hardness and impact resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these balls rust if used outdoors?\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 outdoor and humid conditions. It is not fully immune — prolonged exposure to saltwater, chlorinated water, or strong acids can cause surface pitting over time. For marine or pool environments, 316 stainless steel offers better chloride resistance. For general outdoor use, 304 is a practical and cost-effective choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as replacement rolling elements in a bearing housing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are suitable for light-duty bearing replacement in applications such as drawer slides, lazy susans, and low-speed rotating assemblies. They are not precision-grade (ABEC\/ISO rated) balls. If your application requires tight dimensional tolerances (Grade 10 or better), low noise, or high-speed rotation, please contact us to confirm suitability or browse our precision bearing listings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the balls compatible with valve seats or fluid systems?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel is widely used in low-pressure water, oil, and mild chemical valve applications. Verify that the ball diameter matches your valve seat bore — the typical tolerance for a good seal is ±0.02 mm or tighter. For high-pressure or aggressive chemical environments, consult your system specifications before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much does each ball weigh?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWeight depends on diameter. Using the density of 304 SS (~7.9 g\/cm³), approximate weights are: 10 mm ≈ 4.1 g, 12 mm ≈ 7.1 g, 14 mm ≈ 11.3 g, 16 mm ≈ 16.9 g, 18 mm ≈ 24.1 g, 20 mm ≈ 33.0 g. Intermediate sizes fall proportionally between these values. These figures are calculated estimates; contact us if you need certified weight data for a specific size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between 304 and 316 stainless steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth are austenitic stainless grades, but 316 adds molybdenum, which significantly improves resistance to chloride pitting and crevice corrosion. For most DIY, slingshot, and general mechanical uses, 304 provides adequate corrosion resistance at a lower cost. Choose 316 if your application involves saltwater, marine exposure, or chlorinated environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e\n\u003cp\u003e🛒 Select your Ball Size and Package Quantity above, then add to cart.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"10mm \/ 2pcs","offer_id":52410082328850,"sku":"XPX3702x2","price":3.4,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 5pcs","offer_id":52410082361618,"sku":"XPX3702x5","price":5.03,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 10pcs","offer_id":52410082394386,"sku":"XPX3702x10","price":7.32,"currency_code":"USD","in_stock":true},{"title":"11mm \/ 2pcs","offer_id":52410082427154,"sku":"XPX3703x2","price":4.6,"currency_code":"USD","in_stock":true},{"title":"11mm \/ 5pcs","offer_id":52410082459922,"sku":"XPX3703x5","price":5.41,"currency_code":"USD","in_stock":true},{"title":"11mm \/ 10pcs","offer_id":52410082492690,"sku":"XPX3703x10","price":8.68,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 2pcs","offer_id":52410082525458,"sku":"XPX3704x2","price":4.76,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 5pcs","offer_id":52410082558226,"sku":"XPX3704x5","price":6.23,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 10pcs","offer_id":52410082590994,"sku":"XPX3704x10","price":10.85,"currency_code":"USD","in_stock":true},{"title":"13mm \/ 2pcs","offer_id":52410082623762,"sku":"XPX3705x2","price":4.87,"currency_code":"USD","in_stock":true},{"title":"13mm \/ 5pcs","offer_id":52410082656530,"sku":"XPX3705x5","price":7.32,"currency_code":"USD","in_stock":true},{"title":"13mm \/ 10pcs","offer_id":52410082689298,"sku":"XPX3705x10","price":13.03,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 2pcs","offer_id":52410082722066,"sku":"XPX3706x2","price":5.14,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 5pcs","offer_id":52410082754834,"sku":"XPX3706x5","price":8.68,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 10pcs","offer_id":52410082787602,"sku":"XPX3706x10","price":15.48,"currency_code":"USD","in_stock":true},{"title":"15mm \/ 2pcs","offer_id":52410082820370,"sku":"XPX3707x2","price":5.41,"currency_code":"USD","in_stock":true},{"title":"15mm \/ 5pcs","offer_id":52410082853138,"sku":"XPX3707x5","price":10.31,"currency_code":"USD","in_stock":true},{"title":"15mm \/ 10pcs","offer_id":52410082885906,"sku":"XPX3707x10","price":18.9,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 2pcs","offer_id":52410082918674,"sku":"XPX3708x2","price":5.96,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 5pcs","offer_id":52410082951442,"sku":"XPX3708x5","price":12.21,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 10pcs","offer_id":52410082984210,"sku":"XPX3708x10","price":22.55,"currency_code":"USD","in_stock":true},{"title":"17mm \/ 2pcs","offer_id":52410083016978,"sku":"XPX3709x2","price":6.77,"currency_code":"USD","in_stock":true},{"title":"17mm \/ 5pcs","offer_id":52410083049746,"sku":"XPX3709x5","price":14.39,"currency_code":"USD","in_stock":true},{"title":"17mm \/ 10pcs","offer_id":52410083082514,"sku":"XPX3709x10","price":26.9,"currency_code":"USD","in_stock":true},{"title":"18mm \/ 2pcs","offer_id":52410083115282,"sku":"XPX3710x2","price":7.32,"currency_code":"USD","in_stock":true},{"title":"18mm \/ 5pcs","offer_id":52410083148050,"sku":"XPX3710x5","price":15.75,"currency_code":"USD","in_stock":true},{"title":"18mm \/ 10pcs","offer_id":52410083180818,"sku":"XPX3710x10","price":29.62,"currency_code":"USD","in_stock":true},{"title":"19mm \/ 2pcs","offer_id":52410083213586,"sku":"XPX3711x2","price":8.68,"currency_code":"USD","in_stock":true},{"title":"19mm \/ 5pcs","offer_id":52410083246354,"sku":"XPX3711x5","price":19.01,"currency_code":"USD","in_stock":true},{"title":"19mm \/ 10pcs","offer_id":52410083279122,"sku":"XPX3711x10","price":36.15,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 2pcs","offer_id":52410083311890,"sku":"XPX3712x2","price":9.93,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 5pcs","offer_id":52410083344658,"sku":"XPX3712x5","price":21.73,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 10pcs","offer_id":52410083377426,"sku":"XPX3712x10","price":42.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_53eb5b1b-eda2-401d-94db-b633470c8b61.jpg?v=1782372977","url":"https:\/\/homediyer.com\/products\/304-stainless-steel-ball-bearings-slingshot-ammo-10-20mm","provider":"HomeDIYer","version":"1.0","type":"link"}