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Engineers, machinists, and DIY builders who need exact rolling-element dimensions often struggle to source individual ball bearings in non-standard sizes without ordering full industrial lots. These GCR15 chrome steel solid ball bearings solve that problem by offering a wide diameter range — from 1 mm (0.039 in) up to 200 mm (7.874 in) — available in single-piece or 100-piece quantities, so you only buy what your project actually requires.
Each ball is machined from GCR15 bearing-grade chrome steel, a high-carbon chromium alloy widely used in precision bearing manufacture. Diameters span 1 mm to 200 mm (approximately 0.039 in to 7.874 in), with many fractional-inch and metric sizes included. Surface finish is precision-ground to tight sphericity tolerances typical of Grade 10–25 bearing balls, though exact grade varies by size — see variant options for confirmation.
Typical use cases include replacement rolling elements in deep-groove ball bearings and linear slides, load-distribution balls in jigs and fixtures, check-valve seats in hydraulic and pneumatic circuits, and decorative or kinetic art installations requiring precise spheres. Long-tail applications include CNC router spindle rebuilds, 3D-printer extruder idler replacements, and custom bearing housings for robotics projects.
| Material | GCR15 Chrome Steel (High-Carbon Chromium Bearing Steel) |
|---|---|
| Diameter Range | 1 mm – 200 mm (0.039 in – 7.874 in) |
| Available Diameters | See variant options (metric and fractional-inch sizes) |
| Surface Finish | Precision-ground; sphericity tolerance typically Grade 10–25 (varies by size) |
| Hardness | Typically 60–66 HRC (varies by size; see variant options to confirm) |
| Quantity per Order | 1 pcs or 100 pcs (select via Amount option) |
| Colour / Finish | Bright silver metallic (natural ground steel) |
| Weight per Ball | See variant options (varies significantly by diameter) |
| Application | Bearing races, check valves, jigs, fixtures, linear motion, robotics |
| Certification / Grade | See variant options to confirm |
Measure the inner race diameter of your bearing housing or the seat bore with a digital caliper. The ball diameter must match the race groove radius — typically the ball OD equals the groove radius × 2. If you are replacing existing balls, measure a removed ball directly. Refer to your bearing manufacturer's datasheet for the exact ball complement diameter.
GCR15 chrome steel balls are widely used as check-valve seats in hydraulic and pneumatic circuits operating with mineral oils and air. They are not recommended for highly corrosive media such as seawater, strong acids, or chlorinated fluids without additional protective measures. For aggressive media, consider stainless steel balls instead.
GCR15 contains approximately 1.3–1.65% chromium, which provides moderate oxidation resistance in dry indoor environments. It is not stainless steel and will develop surface rust if exposed to moisture, salt, or corrosive chemicals over time. For outdoor or wet environments, apply a light oil coating or choose stainless steel balls.
Load capacity depends on ball diameter, hardness, and the housing material. GCR15 balls at 60–66 HRC hardness offer fatigue life comparable to standard bearing-grade balls. For critical load calculations, use the Hertzian contact stress formula with your specific diameter and application parameters. We recommend consulting a mechanical engineer for safety-critical load-bearing applications.
Yes. Common applications include replacing idler bearing balls in 3D-printer extruders, rebuilding spindle bearings in small CNC routers, and constructing custom linear motion carriages. Select the diameter that matches your existing bearing race or housing specification. Smaller sizes (1–10 mm) are most common for desktop machines.
Each order is for a single diameter. When you select a diameter from the Diameter option and choose 100 pcs from the Amount option, you receive 100 balls of that one diameter. Mixed-diameter assortments are not available through this listing — place separate orders for each size you need.
Store balls in a dry, climate-controlled environment away from moisture and corrosive fumes. Apply a thin film of machine oil or VCI (Volatile Corrosion Inhibitor) paper wrap for long-term storage. Avoid storing in open containers in humid workshops without protection.
