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When a loose or undersized ball bearing causes wobble, noise, or premature wear in your project, the fix starts with choosing the right grade. Hobbyists, engineers, and makers who demand repeatable accuracy rely on chrome steel Grade 200 ball bearings to keep their assemblies running true — whether they're building from scratch or replacing worn components.
These chrome steel ball bearings are manufactured to ABEC Grade 200 tolerances, offering a spherical surface finish that minimizes friction and maximizes load distribution. Available in diameters ranging from 1mm (0.039 in) to 10mm (0.394 in), including fractional inch equivalents such as 3/32" (2.381mm), 1/8" (3.175mm), 5/32" (3.969mm), 3/16" (4.763mm), 7/32" (5.556mm), and 1/4" (6.35mm), this range covers both metric and imperial applications in a single product line.
Typical use cases include DIY linear motion systems and drawer slides, RC car and drone drivetrain assemblies requiring chrome steel ball bearings for smooth rotation, and precision instrument repair where tight-tolerance replacement balls are essential for restoring original performance.
Manufactured to Grade 200 sphericity standards, delivering consistent roundness and surface finish for low-friction, low-vibration operation in precision assemblies.
Made from through-hardened chrome steel (equivalent to 52100 bearing steel), providing excellent hardness, wear resistance, and fatigue life under cyclic loading.
Available from 1mm to 10mm including fractional inch sizes (3/32", 1/8", 5/32", 3/16", 1/4"), covering both metric and imperial bearing races without adapters.
Choose 100-piece or 200-piece packs to stock your workshop, reduce per-unit cost, and always have the right size on hand for repairs and new builds.
Chrome steel's inherent oxide layer provides moderate corrosion resistance suitable for indoor mechanical environments, dry assemblies, and lightly lubricated applications.
Sized to match standard bearing races and housings — ideal for replacing worn balls in existing bearings, linear guides, and ball-end linkages without machining.
| Material | Chrome Steel (52100 equivalent) |
|---|---|
| Grade | Grade 200 |
| Diameter Range | 1mm – 10mm (0.039" – 0.394") |
| Available Sizes | 1, 1.5, 2, 2.381, 2.5, 2.778, 3, 3.175, 3.5, 3.969, 4, 4.5, 4.763, 5, 5.5, 6, 6.35, 7, 7.144, 8, 8.5, 9, 9.5, 10 mm |
| Pack Quantities | 100 pcs / 200 pcs |
| Surface Finish | See variant options |
| Hardness | See variant options |
| Corrosion Resistance | Moderate (indoor / dry environments) |
| Application | Bearings, linear motion, RC vehicles, instruments, DIY machinery |
| Weight (per pack) | See variant options |
Measure the inner diameter of your bearing race or housing with a caliper. The ball diameter should match the race groove radius — typically the ball OD equals the race ID divided by the number of balls times a fit factor. If you are replacing existing balls, measure a removed ball directly. This listing covers 1mm through 10mm including common fractional inch equivalents (3/32", 1/8", 5/32", 3/16", 1/4"), so you can match both metric and imperial races.
Grade 200 refers to the ABEC/ISO sphericity tolerance class. A Grade 200 ball has a maximum deviation from a perfect sphere of 200 millionths of an inch (approximately 5 micrometers). This is suitable for general-purpose and light-precision applications such as DIY machinery, RC vehicles, and instrument repair where tighter grades (Grade 25 or Grade 10) are not required.
Chrome steel (52100 equivalent) is through-hardened to typically 60–67 HRC, giving it excellent compressive strength and fatigue resistance under cyclic radial and axial loads. For light-to-medium DIY loads — drawer slides, small motors, RC drivetrains, and hand tools — Grade 200 chrome steel balls are well suited. For heavy industrial or high-speed spindle applications, consult a bearing engineer for a higher-grade specification.
Chrome steel provides moderate corrosion resistance through its natural oxide layer, but it is not stainless steel. For dry indoor environments and lightly lubricated assemblies, chrome steel performs reliably. If your application involves water exposure, high humidity, or chemical contact, consider stainless steel ball bearings instead. Applying a light machine oil or grease will significantly extend service life in borderline conditions.
Yes — if you can disassemble the bearing and access the ball complement, these Grade 200 chrome steel balls can serve as direct replacements provided the diameter matches exactly. Use a caliper to measure the original balls before ordering. Replace the entire ball complement at once rather than mixing old and new balls, as uneven wear between balls increases noise and reduces bearing life.
Both packs contain the same Grade 200 chrome steel balls — the only difference is quantity. The 200-piece pack offers a lower per-unit cost and is ideal if you are stocking a workshop, running a production batch, or working on a project that requires a large ball complement. The 100-piece pack suits single-project repairs or initial testing of a new size before committing to a larger quantity.
Yes. This listing includes several fractional inch equivalents alongside metric sizes: 2.381mm (3/32"), 3.175mm (1/8"), 3.969mm (5/32"), 4.763mm (3/16"), 6.35mm (1/4"), and 7.144mm (9/32"). These cover the most common imperial bearing sizes used in North American DIY and hobby applications, so you can source metric and imperial sizes from a single listing.
