{"product_id":"steel-ball-bearings-3mm-6mm-slingshot-ammo-catapult","title":"50\/100\/200pcs Rolling Ball Bearings 3mm-6mm Catapult Slingshot Ammo Steel Ball","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSteel Ball Bearings 3mm–6mm — Precision Rolling Elements for Slingshots, Catapults \u0026amp; DIY Builds\u003c\/h2\u003e\n\u003cp\u003eWhen a mismatched ball diameter causes a slingshot to shoot wide, or a worn bearing seat starts rattling mid-project, the fix starts with sourcing the right rolling element. These steel ball bearings are stocked for makers, hobbyists, and repair technicians who need a reliable supply of precision-ground balls across a wide size range — without ordering from multiple suppliers.\u003c\/p\u003e\n\u003cp\u003eEach ball is manufactured from either Carbon Steel or Bearing Steel (GCr15 equivalent), with diameters spanning 3 mm to 5.953 mm (approximately 0.118 in to 0.234 in). Balls are available in packs of 50, 100, or 200 pieces, letting you stock exactly what your project demands. Surface finish is smooth and consistent across the batch, with tight spherical tolerances suited to both mechanical and projectile applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include slingshot and catapult ammunition where consistent diameter and mass matter for accuracy, replacement rolling elements in small radial bearings and linear slides, and general DIY applications such as ball-end linkages, gravity feeds, and check-valve seats. The 3.175 mm (1\/8 in) and 3.969 mm (5\/32 in) sizes are particularly popular for standard imperial bearing replacements.\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 required diameter before ordering. Ball size options range from 3 mm to 5.953 mm. Carbon Steel balls are suited for general mechanical and projectile use; Bearing Steel (GCr15) balls offer higher hardness and are recommended for load-bearing rolling contact applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 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 Size Range:\u003c\/strong\u003e 12 diameter options from 3 mm to 5.953 mm (0.118 in – 0.234 in) cover both metric and common imperial sizes in a single product listing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eTwo Material Grades:\u003c\/strong\u003e Carbon Steel for general-purpose and projectile use; Bearing Steel (GCr15 equivalent) for higher-hardness rolling contact applications requiring tighter fatigue resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities:\u003c\/strong\u003e Choose 50, 100, or 200 pieces per order — scale your purchase to match prototype runs, repair kits, or bulk restocking needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eConsistent Spherical Tolerance:\u003c\/strong\u003e Precision-ground surface finish ensures uniform diameter across the batch, reducing wobble in bearing seats and improving shot consistency in slingshot or catapult use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003ePredictable Mass per Ball:\u003c\/strong\u003e Uniform density and diameter mean consistent projectile weight — critical for repeatable accuracy when used as slingshot or catapult ammo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad Application Fit:\u003c\/strong\u003e Suitable for radial bearing replacement, linear slide elements, ball-end linkages, check-valve seats, gravity feed systems, and recreational projectile use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003ePrecision Steel Ball Bearings \/ Rolling Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel; Bearing Steel (GCr15 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e3 mm – 5.953 mm (0.118 in – 0.234 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e3 mm, 3.175 mm, 3.5 mm, 3.969 mm, 4 mm, 4.5 mm, 4.763 mm, 4.8 mm, 5.46 mm, 5.48 mm, 5.556 mm, 5.953 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Quantities\u003c\/th\u003e\n\u003ctd\u003e50 pcs \/ 100 pcs \/ 200 pcs\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\u003eHardness (Bearing Steel)\u003c\/th\u003e\n\u003ctd\u003eTypically 60–66 HRC (GCr15 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Carbon Steel)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpherical Tolerance Grade\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eSlingshot ammo, catapult projectiles, radial bearing replacement, linear slides, check-valve seats, DIY linkages\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Pack\u003c\/th\u003e\n\u003ctd\u003eSee variant options (varies by diameter and quantity)\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 or catapult?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the ball diameter to your slingshot pouch width and band tension. Smaller balls (3 mm – 3.5 mm) suit lighter bands and shorter draw lengths, while larger balls (4.5 mm – 5.953 mm) pair better with heavier bands for more energy transfer. For catapults, check the cup or cradle diameter and select a ball that seats snugly without excessive play.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Carbon Steel and Bearing Steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon Steel balls are a cost-effective choice for general mechanical use and projectile applications where extreme hardness is not required. Bearing Steel (GCr15 equivalent) balls are through-hardened to typically 60–66 HRC, offering superior fatigue resistance and wear life under rolling contact loads — making them the better choice for replacing balls in radial bearings, linear slides, or any application with repeated load cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth Carbon Steel and Bearing Steel grades offer limited corrosion resistance on their own. For outdoor or humid environments, apply a light coat of machine oil or grease after handling to slow surface oxidation. If corrosion resistance is a primary requirement, consider stainless steel balls instead — these listings cover carbon and bearing steel grades only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls as direct replacements in existing bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided you match the diameter exactly to your bearing's ball complement specification. Measure the existing balls with a micrometer before ordering. The 3.175 mm (1\/8 in) and 3.969 mm (5\/32 in) sizes correspond to common imperial bearing ball sizes. Always replace the full complement of balls in a bearing — mixing old and new balls of slightly different wear levels can cause uneven load distribution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich pack size should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 50-piece pack suits small repair jobs or prototype testing where you need a handful of balls to verify fit and function. The 100-piece pack is a practical middle ground for hobbyist restocking or a single slingshot season's supply. The 200-piece pack offers the lowest per-unit cost and is suited for workshop stock, bulk bearing rebuilds, or regular recreational shooting use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tolerances do these balls meet, and are they suitable for precision instruments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are precision-ground for consistent diameter within a batch, making them suitable for slingshot ammo, light-duty bearing replacement, and general DIY applications. For instruments requiring certified Grade 10 or Grade 25 tolerances (per ISO 3290), contact us to confirm the specific tolerance grade before ordering, as tolerance documentation varies by batch.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo the balls come lubricated?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe balls are supplied dry (unlubricated). For bearing applications, apply the appropriate grease or oil for your load and speed conditions before installation. For slingshot or catapult use, no lubrication is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Material, Ball Size, and Package 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 \/ 3mm \/ 50pcs","offer_id":52410083442962,"sku":"XPX3533x50","price":5.14,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 3mm \/ 100pcs","offer_id":52410083475730,"sku":"XPX3533x100","price":5.96,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 3mm \/ 200pcs","offer_id":52410083508498,"sku":"XPX3533x200","price":8.13,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 3.175mm \/ 50pcs","offer_id":52410083541266,"sku":"XPX3534x50","price":5.14,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ 3.175mm \/ 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