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When accuracy matters — whether you're loading a slingshot for target practice or sourcing rolling elements for a mechanical assembly — inconsistent ball diameter and surface finish are the first things that cost you performance. These carbon steel ball bearings are sized for shooters, hobbyists, and engineers who need repeatable results across every shot or rotation cycle.
Each ball is machined from carbon steel and finished to a smooth, uniform spherical surface. Diameter options span 1mm (0.039 in) through 10mm (0.394 in), covering both metric and fractional imperial sizes such as 3.175mm (1/8 in), 4.763mm (3/16 in), 5.556mm (7/32 in), 6.35mm (1/4 in), 7.144mm (9/32 in), 7.938mm (5/16 in), 8.731mm (11/32 in), and 9.525mm (3/8 in). Available in packs of 100, 200, or 500 pieces.
Typical use cases include slingshot and catapult ammunition for backyard target shooting, replacement rolling elements in light-duty bearings and linear guides, and precision fill media for DIY projects such as weighted handles, counterbalances, and ball-valve assemblies. The consistent diameter tolerance makes these carbon steel ball bearings a reliable choice wherever spherical rolling elements are required.
| Material | Carbon steel |
|---|---|
| Surface Finish | Ground and polished spherical surface |
| Diameter Range | 1mm – 10mm (0.039 in – 0.394 in) |
| Available Diameters | 1, 1.5, 2, 2.5, 3, 3.175, 3.5, 3.969, 4, 4.5, 4.763, 4.8, 5, 5.5, 5.556, 5.9, 5.953, 6, 6.35, 6.5, 6.6, 6.747, 6.8, 7, 7.144, 7.5, 7.938, 8, 8.1, 8.5, 8.731, 9, 9.5, 9.525, 10 mm |
| Pack Quantity Options | 100 pcs / 200 pcs / 500 pcs |
| Ball Type | Solid (no hollow core) |
| Diameter Tolerance | See variant options |
| Hardness | See variant options |
| Corrosion Resistance | Standard carbon steel — not stainless; protect from prolonged moisture exposure |
| Typical Applications | Slingshot ammo, catapult projectiles, light-duty bearing replacement, ball-valve media, DIY weighted assemblies |
Measure the inner diameter of your slingshot pouch or catapult cup with calipers. Select the ball diameter that fits snugly without excessive play — typically within 0.5mm of the pouch opening. For most standard wrist-rocket slingshots, 6mm–10mm balls are the most common fit. Refer to your slingshot manufacturer's recommended ammo size if available.
Carbon steel has sufficient hardness for repeated slingshot and catapult use under normal recreational loads. The solid construction means there is no hollow core to collapse on impact. For high-powered competition slingshots generating very high band tension, verify the steel grade meets your specific energy requirements before extended use.
Carbon steel is not stainless and will oxidize when exposed to prolonged moisture. For outdoor storage or humid workshop conditions, keep the balls in a sealed container with a desiccant packet, or apply a light coat of oil. If corrosion resistance is a primary requirement, consider stainless steel ball bearings instead.
These balls are suitable as replacement rolling elements in light-duty bearing housings where the bore matches one of the available diameters. Confirm the required ball diameter, material grade, and surface finish tolerance against your bearing specification sheet. For precision or high-load industrial bearings, contact us to confirm suitability before ordering.
Several sizes in this listing are fractional imperial equivalents expressed in millimeters: 3.175mm = 1/8", 4.763mm = 3/16", 5.556mm = 7/32", 6.35mm = 1/4", 7.144mm = 9/32", 7.938mm = 5/16", 8.731mm = 11/32", 9.525mm = 3/8". If your application specifies an imperial fraction, select the corresponding mm value from the variant dropdown.
The 100-piece pack suits occasional use or initial testing of a new diameter. The 200-piece pack is a practical mid-range option for regular range sessions. The 500-piece pack offers the lowest per-unit cost and is recommended for frequent shooters, bulk mechanical assembly, or stocking multiple diameters at once. Per-piece pricing decreases with larger quantities.
Carbon steel balls can function as valve media in dry or low-moisture environments. For fluid-control applications involving water, chemicals, or steam, stainless steel or other corrosion-resistant materials are typically required. Confirm the valve seat diameter and material compatibility with your system specifications before use.
