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Finding the exact diameter bearing ball for a repair, prototype, or mechanical assembly can be a frustrating experience when standard packs force you to buy sizes you don't need. Whether you're a machinist, hobbyist, or maintenance technician, these loose high-precision steel bearing balls let you select exactly the diameter and quantity you need — from a single piece to bulk packs of 1,000.
Each ball is a solid steel sphere machined to tight tolerances. The diameter range spans 1mm (≈0.039 in) to 29.6mm (≈1.165 in), covering both metric and inch-equivalent sizes. Balls are available in a wide selection of diameters including 1mm, 1.2mm, 1.5mm, 1.588mm (1/16"), 1.6mm, 1.8mm, 2mm, 2.381mm (3/32"), 2.5mm, 2.778mm (7/64"), 2.8mm, 3mm, 3.175mm (1/8"), 3.2mm, 3.5mm, 3.969mm (5/32"), 4mm, 4.1mm, 4.5mm, 4.763mm (3/16"), 4.8mm, 5mm, 5.2mm, 5.4mm, 5.5mm, 5.556mm (7/32"), 5.953mm (15/64"), 6mm, 12.5mm, 12.7mm (1/2"), 20.5mm, 20.638mm (13/16"), 21.43mm, 21.431mm, 22.225mm (7/8"), 22.5mm, 22.8mm, 23.5mm, 23.813mm (15/16"), 24.5mm, 24.606mm, 25.1mm, 25.2mm, 25.3mm, 25.4mm (1"), 25.5mm, 25.8mm, 26.2mm, 26.5mm, 27.5mm, 28.57mm, 28.575mm (1-1/8"), 29.2mm, 29.3mm, 29.5mm, and 29.6mm.
These solid metal balls are widely used in bearing replacement and maintenance, ball-end linkage assemblies, valve seats and check valves, decorative metalwork and jewelry making, and precision jig and fixture construction. Their consistent roundness and surface finish make them suitable for load-bearing, rolling, and sealing applications across DIY and light industrial contexts.
Available from 1mm to 29.6mm, covering metric and inch-equivalent sizes to match both standard and non-standard bearing housings.
Each ball is a solid steel sphere — not hollow — providing the structural integrity needed for load-bearing, rolling contact, and valve sealing applications.
Manufactured to tight dimensional tolerances for consistent roundness and surface finish, reducing vibration and wear in rolling contact applications.
Order from 1 piece up to 1,000 pieces per variant — ideal for single repairs, prototyping, or stocking a workshop supply.
Suitable for bearing replacement, check valves, ball-end linkages, decorative metalwork, and precision fixtures across DIY and light industrial use.
Made from steel with inherent corrosion resistance suitable for dry and lightly lubricated environments; for wet or chemical environments, confirm material grade with your application requirements.
| Material | Steel (solid) |
|---|---|
| Diameter Range | 1mm – 29.6mm (≈0.039 in – ≈1.165 in) |
| Available Diameters | See variant options |
| Quantity Options | 1, 2, 3, 5, 8, 10, 20 PCS; 500, 1000 PCS (bulk, select sizes) |
| Ball Type | Loose / unmounted |
| Surface Finish | See variant options |
| Tolerance Grade | See variant options |
| Application | Bearing replacement, check valves, linkages, fixtures, decorative metalwork |
| Weight per Ball | See variant options |
Measure the inner bore of your bearing housing or the seat diameter of your valve using a caliper. Match that measurement to the closest available diameter in the variant selector. For bearing replacement, the ball diameter must match the original specification — consult your bearing's datasheet or measure the existing balls directly.
These are solid steel balls throughout — not hollow. This makes them suitable for load-bearing, rolling contact, and valve sealing applications where structural integrity under compression is required.
The balls are made from steel with inherent corrosion resistance suitable for dry and lightly lubricated environments. For applications involving water, chemicals, or high humidity, we recommend confirming the specific steel grade with your application requirements. Light lubrication will extend service life in most mechanical applications.
Yes. Loose steel balls are commonly used as valve seats in check valves and ball valves. Select the diameter that matches your valve seat specification. Ensure the ball material is compatible with the fluid or gas in your system before installation.
Some diameters listed (e.g., 1.588mm, 3.175mm, 4.763mm, 12.7mm, 25.4mm, 28.575mm) are metric expressions of standard inch fractions (1/16", 1/8", 3/16", 1/2", 1", 1-1/8" respectively). These are interchangeable with their inch equivalents and are commonly used in both metric and imperial bearing systems.
For single repairs or prototyping, the 1–20 PCS options offer the most flexibility. If you maintain equipment regularly or run a workshop, the 500 or 1,000 PCS bulk options (available for smaller diameters) provide significant cost savings per ball. Select the quantity that matches your expected usage to avoid overstocking.
These balls are described as high-precision and are suitable for general mechanical and DIY applications. For critical high-speed or high-load industrial bearing applications, confirm the tolerance grade (G-grade) with your engineering specifications before use.
