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When a worn or undersized ball bearing causes your wheel hub to grind, your headset to wobble, or your bottom bracket to drag, the fix starts with sourcing the right replacement. Cyclists, mechanics, and DIY enthusiasts who demand dimensional accuracy know that a few microns of variance can mean the difference between a smooth ride and premature wear. These Grade 10 stainless steel loose ball bearings are stocked in a wide diameter range specifically to cover the replacement needs of road bikes, mountain bikes, BMX, and general cycle components.
Each ball is manufactured from stainless steel to Grade 10 tolerances, delivering a spherical deviation of no more than 0.25 µm at this grade level. Diameters span 1.0 mm to 3.0 mm (approximately 0.039 in to 0.118 in), with many intermediate sizes available — including fractional-inch equivalents such as 1.588 mm (1/16 in), 2.381 mm (3/32 in), and 2.778 mm (7/64 in) — to match both metric and imperial bearing races. Pack sizes range from 1 piece up to 2,000 pieces to suit single-repair jobs and workshop restocking alike.
Typical applications include bicycle wheel hub bearings, headset cups, bottom bracket cartridges, pedal axle bearings, inline skate wheels, and light-duty industrial pivot points where a corrosion-resistant Grade 10 stainless steel loose ball bearing is required. The broad size selection also makes these suitable for model engineering, clock repair, and any application where a loose ball must be matched to an existing race.
| Material | Stainless Steel |
|---|---|
| Grade | Grade 10 |
| Diameter Range | 1.0 mm – 3.0 mm (approx. 0.039 in – 0.118 in) |
| Available Diameters | See variant options |
| Pack Sizes | 1, 10, 20, 50, 100, 200, 500, 1000, 2000 pieces |
| Surface Finish | Smooth ground, bright finish |
| Corrosion Resistance | Yes — stainless steel alloy |
| Sphericity Tolerance | ≤ 0.25 µm (Grade 10) |
| Typical Applications | Bicycle hubs, headsets, bottom brackets, pedals, inline skates, light industrial pivots |
| Compatibility | Open-race bearing cups — confirm diameter with micrometer before ordering |
Remove one of the existing balls from the bearing race and measure it across its widest point using a digital micrometer or vernier caliper. Record the measurement in millimetres and select the matching diameter from the variant options. Avoid measuring with a ruler — even a 0.05 mm error can cause the replacement ball to fit too loosely or too tightly in the race.
Grade 10 refers to the ABMA/ISO precision classification for ball bearings. It specifies that the maximum allowable spherical deviation (out-of-roundness) is 0.25 µm (0.00025 mm). Grade 10 balls are suitable for bicycle hubs, headsets, and similar applications where smooth rolling and consistent load distribution are required, without the cost of ultra-precision grades used in high-speed spindles.
Yes. The range includes several sizes that correspond to common fractional-inch specifications: 1.588 mm (1/16 in), 2.381 mm (3/32 in), 2.778 mm (7/64 in), and 3.0 mm (approximately 0.118 in / close to 3/32 in). Always verify the exact diameter of your existing balls before ordering, as nominal inch sizes can vary slightly between manufacturers.
Stainless steel offers significantly better corrosion resistance than carbon steel balls. In typical cycling conditions — rain, mud, and humidity — stainless steel balls will resist surface rust and pitting far longer than standard steel alternatives. For best results, re-grease the bearing race with a water-resistant bicycle grease after installation and inspect periodically if riding in consistently wet conditions.
The number of balls per race varies by hub design and ball diameter. A typical front hub uses 9–10 balls per side (18–20 total), while rear hubs commonly use 9 balls on the drive side and 10 on the non-drive side. Headsets typically use 18–22 balls per cup. Count your existing balls carefully before ordering, and consider purchasing a few extra to account for any that may be lost during reassembly.
Yes. These Grade 10 stainless steel balls are suitable for any open-race bearing application that falls within the 1.0–3.0 mm diameter range. Common non-cycling uses include inline skate wheels, kick scooter pivot bearings, model engineering projects, clock and watch repair (larger sizes), and light-duty industrial pivot points. Confirm the required diameter and grade specification for your application before ordering.
Loose (uncaged) ball bearings are individual balls that sit directly in an open bearing race, held in place by grease. They are the traditional design used in most cup-and-cone bicycle hubs, headsets, and pedals. Caged or cartridge bearings enclose the balls in a sealed unit with inner and outer races. Loose balls allow more balls per race (higher load capacity) and are field-serviceable with basic tools, making them the preferred choice for traditional bicycle maintenance.
