{"product_id":"carbon-steel-ball-bearings-slingshot-bb","title":"Catapult Slingshot BB Carbon Steel Ball Bearings 1mm 2mm 3mm 4mm 5mm to 20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCarbon Steel Ball Bearings for Slingshot, Catapult \u0026amp; Precision DIY — 1mm to 20mm\u003c\/h2\u003e\n\u003cp\u003eWhen your slingshot groups are inconsistent or your catapult ammo rolls off-spec, the culprit is almost always ball quality. Hobbyists, competitive slingshot shooters, and precision DIY builders need balls that are dimensionally repeatable shot after shot — and that's exactly what these carbon steel ball bearings deliver.\u003c\/p\u003e\n\u003cp\u003eEach pack contains carbon steel ball bearings with a hardened surface finish. Diameters span 1mm through 20mm (approximately 0.039\" to 0.787\"), covering both metric and fractional inch sizes such as 3.175mm (1\/8\"), 4.763mm (3\/16\"), 5.556mm (7\/32\"), 7.938mm (5\/16\"), and 9.525mm (3\/8\"). Pack quantities range from 10 to 1,000 pieces to suit single-project needs or bulk restocking.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include slingshot and wrist-rocket ammo for target practice, catapult projectiles for physics demonstrations and hobby builds, replacement rolling elements in light-duty bearing housings, and precision spacers or detent balls in mechanical assemblies. The consistent sphericity makes these carbon steel ball bearings a reliable choice wherever dimensional accuracy matters.\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 Sized for standard slingshot bands and catapult pouches. Fractional-inch sizes (3.175mm, 4.763mm, 5.556mm, 7.938mm, 9.525mm) fit common imperial-spec bearing housings. Verify your pouch or housing bore before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Carbon 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\u003eWide diameter range:\u003c\/strong\u003e 1mm to 20mm in a single product line — metric and fractional inch sizes available, eliminating the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCarbon steel construction:\u003c\/strong\u003e Hardened carbon steel provides the density and surface hardness needed for consistent ballistic performance in slingshots and catapults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible pack quantities:\u003c\/strong\u003e Choose 10, 50, 100, 500, or 1,000 pieces — scale your order to match a one-off repair or a bulk project build.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eTight spherical tolerance:\u003c\/strong\u003e Controlled roundness ensures repeatable roll and consistent grouping, critical for target shooting and precision mechanical use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003ePredictable weight per ball:\u003c\/strong\u003e Carbon steel density (~7.85 g\/cm³) means each diameter delivers a known mass — useful for calculating catapult energy or detent spring loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eMulti-application versatility:\u003c\/strong\u003e Suitable as slingshot ammo, catapult projectiles, detent balls, bearing replacements, and precision spacers across hobby and light mechanical applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Carbon Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBright \/ hardened (typical for carbon steel balls)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e1mm – 20mm (0.039\" – 0.787\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e10 \/ 50 \/ 100 \/ 500 \/ 1,000 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDensity (approx.)\u003c\/th\u003e\n\u003ctd\u003e~7.85 g\/cm³\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\u003eRoundness Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eLow (carbon steel; not stainless — keep dry or apply light oil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eSlingshot ammo, catapult projectiles, detent balls, bearing replacements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Ball\u003c\/th\u003e\n\u003ctd\u003eSee variant options (varies by diameter)\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\u003eWhich diameter should I choose for my slingshot?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe most common slingshot ammo sizes are 6mm, 8mm, 9.5mm, and 3\/8\" (9.525mm). Smaller diameters (6–8mm) suit lighter bands and shorter draw lengths; larger diameters (9.5–10mm) carry more energy for longer-range target work. Check your band manufacturer's recommended ammo size for best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls strong enough for repeated catapult use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel has sufficient hardness for hobby catapult and slingshot use. The balls resist deformation on impact with soft targets. For repeated high-velocity impacts against hard surfaces, inspect balls periodically for flat spots, which can affect trajectory consistency.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill carbon steel ball bearings rust?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel is not stainless and will oxidize if exposed to moisture over time. Store balls in a dry container and apply a light coat of machine oil if you live in a humid environment or plan to store them long-term. For outdoor or wet-environment use, consider stainless steel alternatives.\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\u003eYes, for light-duty applications. Match the diameter precisely to your housing specification — fractional inch sizes such as 3.175mm (1\/8\"), 4.763mm (3\/16\"), and 9.525mm (3\/8\") are available for imperial-spec housings. For load-rated or high-speed bearings, consult the bearing manufacturer's specification for grade and material requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between pack sizes (10, 50, 100, 500, 1000)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a single repair or test build, a pack of 10–50 is usually sufficient. Competitive slingshot shooters who practice regularly typically order 100–500 at a time. Bulk packs of 500–1,000 offer the best per-ball value for ongoing projects, classroom demonstrations, or resale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the fractional-inch sizes truly imperial, or are they metric conversions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSizes such as 3.175mm, 4.763mm, 5.556mm, 7.938mm, and 9.525mm are the exact metric equivalents of 1\/8\", 3\/16\", 7\/32\", 5\/16\", and 3\/8\" respectively. They are manufactured to those fractional-inch dimensions and are interchangeable with imperial-spec applications within normal tolerance bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the weight of a single ball at a given diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBall weight scales with the cube of the diameter. As a reference: a 6mm carbon steel ball weighs approximately 0.9g; a 10mm ball approximately 4.1g; a 20mm ball approximately 32.7g. Contact us to confirm exact weights for a specific diameter if your application requires precise mass data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Ball Material, Ball Diameter, and Pack Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Carbon Steel \/ 1mm \/ 1000","offer_id":52410454966546,"sku":"DTJSSYX0214x1000","price":5.41,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 1.5mm \/ 1000","offer_id":52410454999314,"sku":"DTJSSYX0215x1000","price":5.41,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 2mm \/ 500","offer_id":52410455032082,"sku":"DTJSSYX0216x500","price":5.41,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 2.5mm \/ 500","offer_id":52410455064850,"sku":"DTJSSYX0217x500","price":5.45,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 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