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When a loose or undersized ball causes your RC differential to slip, your precision instrument to drift, or your industrial assembly to fail prematurely, the root cause is almost always inconsistent ball geometry or inadequate hardness. Machinists, RC hobbyists, engineers, and toolmakers who demand repeatable, tight-tolerance performance need tungsten carbide ball bearings they can trust across every application.
These carbide and steel ball bearings are available in a wide diameter range — from Ø0.5mm (approximately 0.020 in) up to Ø50mm (approximately 1.969 in) — covering both metric and imperial-equivalent sizes. The balls are precision-ground to maintain consistent sphericity and surface finish. Tungsten carbide grades offer exceptional hardness (typically HRA 89–92), while steel variants provide a cost-effective option for standard load applications. Quantity options range from 1 pc to 100 pcs per order to suit prototyping, repair, and bulk production needs.
Typical use cases include RC car and truck differential ball replacement (carbide diff balls), precision bearing assemblies in measuring instruments and gauges, valve seats and check valves in fluid systems, and tooling fixtures requiring hardened locating balls. Long-tail applications include tungsten carbide ball for ball mill grinding media, carbide ball for stylus tips, and steel ball bearings for drawer slides and linear guides.
| Material | Tungsten Carbide (WC-Co) / Steel (grade varies by variant) |
|---|---|
| Diameter Range | Ø0.5mm – Ø50mm (approx. 0.020 in – 1.969 in) |
| Hardness (Carbide) | Typically HRA 89–92 |
| Surface Finish | Precision-ground |
| Sphericity / Tolerance | See variant options |
| Quantity per Pack | 1 / 2 / 5 / 10 / 100 pcs (select above) |
| Application | RC differentials, precision instruments, valve seats, tooling, grinding media |
| Weight | See variant options |
Measure the existing balls in your differential using a micrometer or digital caliper. RC differentials commonly use balls in the Ø1.5mm–Ø5mm range. Match the measured diameter exactly — even a 0.1mm difference can cause binding or excessive play. If you are unsure, consult your vehicle's manual or the differential manufacturer's parts list for the specified ball size.
Tungsten carbide balls are significantly harder (HRA 89–92) than standard steel balls, making them far more resistant to wear, deformation, and surface fatigue under high loads or abrasive conditions. Steel balls are a cost-effective choice for lighter-duty applications where extreme hardness is not required. For RC differentials under aggressive use, carbide balls are the preferred upgrade over stock steel balls.
Tungsten carbide (WC-Co) offers good resistance to many corrosive media including mild acids, alkalis, and water, making it suitable for fluid handling, outdoor RC use, and damp environments. Steel variants have lower inherent corrosion resistance and may require lubrication or protective coatings in wet conditions. If corrosion resistance is critical, select the carbide variant and confirm compatibility with your specific media.
Yes. Tungsten carbide balls are widely used as grinding media in laboratory and small-scale ball mills due to their extreme hardness and wear resistance. They are particularly suitable for grinding hard materials where contamination from softer media would be unacceptable. Select a diameter appropriate for your mill jar size and the particle size you are targeting — smaller balls produce finer grinds.
For a single RC differential repair or instrument calibration, 1–10 pcs is typically sufficient. For production assembly or stocking a workshop, the 100 pcs option offers the best per-unit value. The 2, 5, and 10 pcs options are ideal for small batch prototyping or keeping a spare set on hand. Select the quantity that matches your immediate need to avoid unnecessary inventory.
Measure the housing bore or seat diameter with a calibrated bore gauge or micrometer. The ball diameter should match the specified seat diameter in your engineering drawing or OEM specification. For valve seats, the ball is typically 10–20% larger than the seat orifice to ensure a positive seal. If you need a specific tolerance class (e.g., G10, G16, G25), contact us to confirm availability before ordering.
Yes. Several sizes in this listing correspond to common imperial fractions — for example, Ø1.5875mm (1/16 in), Ø3.175mm (1/8 in), Ø6.35mm (1/4 in), Ø9.525mm (3/8 in), Ø12.7mm (1/2 in), Ø19.05mm (3/4 in), and Ø25.4mm (1 in). Select the diameter that matches your imperial specification from the variant dropdown above.
