Carbon Steel Ball Bearings for Slingshot & Catapult — Consistent 1KG Bulk Supply
When your slingshot or catapult misfires because of inconsistent ammo, every shot is wasted effort. Hobbyists, competitive shooters, and field sport enthusiasts who demand repeatable accuracy need ball bearings that are uniform in diameter, weight, and surface finish — not a mixed bag of rejects.
These carbon steel ball bearings are supplied in a 1KG bulk quantity and are available in 20 precise diameter options ranging from 2.0MM to 8.0MM (approximately 0.079" to 0.315"). Each ball is manufactured to tight roundness tolerances, with a smooth surface finish that reduces friction against the slingshot pouch or catapult cup for consistent release.
Typical use cases include slingshot target practice and competitive shooting, catapult and trebuchet loading for field sport events, and industrial or mechanical applications requiring small-diameter carbon steel spheres — such as valve seats, bearing races, or jig fixtures where a standard chrome steel ball is not required.
⚙️ Compatibility: Fits standard slingshot pouches and catapult cups designed for 2–8mm diameter projectiles. Verify your equipment's recommended ball diameter before selecting a size.
✅ Key Features of These Carbon Steel Ball Bearings
🎯 20 Diameter Options
Available from 2.0MM to 8.0MM in incremental steps, including half-millimeter and fractional sizes (e.g. 5.90MM, 6.90MM, 7.90MM) for precise equipment matching.
⚖️ 1KG Bulk Quantity
Each order contains 1 kilogram of ball bearings in your chosen diameter — enough for extended practice sessions or project stock without frequent reordering.
🔩 Carbon Steel Construction
Made from carbon steel for a balance of hardness and toughness. Suitable for impact-loaded applications like slingshot and catapult use where consistent deformation resistance matters.
🔵 Smooth Surface Finish
Each ball is finished to a smooth surface that minimizes pouch wear and promotes a clean, repeatable release — reducing shot-to-shot variation.
📐 Tight Roundness Tolerance
Manufactured to consistent spherical geometry so each ball tracks predictably through the air, reducing the unpredictable flight paths caused by out-of-round ammo.
🗂️ Wide Size Range for Multi-Use
The 2–8MM range covers common slingshot ammo sizes as well as small industrial sphere applications — valve seats, jig fixtures, and mechanical assemblies.
📐 Technical Specifications — Carbon Steel Ball Bearings
| Material |
Carbon Steel |
| Diameter Range |
2.0MM – 8.0MM (approx. 0.079" – 0.315") |
| Available Sizes |
See variant options |
| Net Weight per Order |
1 KG (approx. 2.2 lbs) |
| Surface Finish |
Smooth (ground finish) |
| Hardness |
See variant options |
| Typical Application |
Slingshot, catapult, valve seats, mechanical assemblies |
| Corrosion Resistance |
Moderate (carbon steel; not stainless — keep dry for storage) |
| Quantity per KG |
See variant options (varies by diameter) |
❓ Frequently Asked Questions
Which size ball bearing should I choose for my slingshot?
The correct size depends on your slingshot's pouch width and band tension. Most flat-band slingshots perform well with 6.0MM–8.0MM balls, while lighter setups or tube-band slingshots often use 5.0MM–6.0MM. Check your slingshot manufacturer's recommended ammo diameter for best results.
How many ball bearings are in 1KG for each size?
The count per kilogram varies significantly by diameter. As a rough guide: 2.0MM balls yield several thousand per KG, while 8.0MM balls yield approximately 200–300 per KG. Exact counts depend on manufacturing tolerances. Contact us to confirm if a specific count is critical for your application.
Are these ball bearings rust-resistant?
These are carbon steel, not stainless steel, so they have moderate corrosion resistance. For outdoor or humid environments, store them in a dry container and apply a light coat of oil if long-term storage is needed. For applications requiring full corrosion resistance, consider stainless steel alternatives.
Can I use these for industrial or mechanical applications?
Yes. Carbon steel balls in the 2–8MM range are commonly used in valve seats, jig fixtures, and low-load bearing races where chrome steel is not required. Verify the hardness and tolerance requirements of your application against the specifications above, or contact us to confirm suitability.
Are these compatible with catapult and trebuchet equipment?
Yes. These balls are suitable for catapult and trebuchet loading where a consistent, dense projectile is needed. Select a diameter that fits your equipment's cup or sling pocket. Larger diameters (6.0MM–8.0MM) are more common for catapult use due to their greater mass per ball.
How do I decide between 5.90MM, 5.95MM, and 6.0MM sizes?
These fractional sizes exist to match equipment with tight dimensional tolerances — for example, valve seats or precision mechanical assemblies that require a specific sphere diameter within a narrow range. For slingshot use, the difference is negligible and any of the three will perform similarly. For mechanical applications, measure your seat or bore diameter and select the closest match.
🛒 Select your SIZE above, then add to cart.
