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When standard carbon-steel balls corrode, seize, or contaminate sensitive assemblies, engineers and makers reach for 316 stainless steel precision balls. Whether you are rebuilding a pump, fabricating a custom valve, or sourcing rolling elements for a DIY linear rail, dimensional inconsistency and surface defects cause premature failure — these Grade 100 balls are manufactured to tight sphericity tolerances to eliminate that risk.
Each ball is machined from 316 stainless steel (18% chromium, 10–14% nickel, 2–3% molybdenum), delivering superior corrosion resistance compared to 304 grade. Available diameters span 2.38 mm (approximately 3/32 in) through 60 mm (approximately 2-3/8 in), covering both metric and imperial fractional sizes. Grade 100 designation indicates a maximum deviation from a perfect sphere of 100 millionths of an inch (2.54 µm), suitable for precision bearing and metering applications.
Typical use cases include replacement rolling elements in stainless ball bearings for marine and food-processing equipment, check-valve seats in hydraulic and pneumatic circuits, and decorative or functional hardware in architectural and DIY metalworking projects requiring corrosion-resistant precision balls.
Contains molybdenum for enhanced resistance to chloride pitting and crevice corrosion — ideal for marine, chemical, and food-grade environments.
Maximum roundness deviation of 2.54 µm (100 millionths of an inch), ensuring consistent load distribution and smooth rolling in precision assemblies.
Sizes from 2.38 mm to 60 mm — including both metric and imperial fractional dimensions — to suit a broad range of bearing, valve, and hardware applications.
Bright, smooth surface finish resists oxidation and staining without additional coating, maintaining dimensional integrity over time.
Available from single pieces up to 3,000-piece bulk packs, making it easy to order exactly what your project or production run requires.
316 SS balls are typically hardened to approximately 25–35 HRC, providing adequate wear resistance for light-to-medium load bearing and valve applications.
| Material | 316 Stainless Steel (18Cr-10Ni-2Mo) |
|---|---|
| Grade | Grade 100 (ABMA / ISO standard) |
| Diameter Range | 2.38 mm – 60 mm (approx. 3/32 in – 2-3/8 in) |
| Sphericity Tolerance | ≤ 2.54 µm (100 millionths of an inch) |
| Surface Finish | Bright, smooth (Ra typically ≤ 0.05 µm) |
| Hardness | Approximately 25–35 HRC |
| Corrosion Resistance | Excellent — suitable for marine, chemical, and food-grade use |
| Available Quantities | 1, 2, 3, 5, 10, 15, 20, 30, 40, 50, 60, 90, 100, 150, 200, 250, 300, 500, 750, 1000, 1500, 2000, 3000 Pcs |
| Pack Options | See variant options |
| Weight per Unit | See variant options |
Measure the inner bore of your bearing race or valve seat with a caliper. Select the ball diameter that matches the specified rolling-element size in your assembly's datasheet. For imperial fractional sizes (e.g., 9.525 mm = 3/8 in, 12.7 mm = 1/2 in), cross-reference the mm value listed in the variant options.
Grade 100 refers to the ABMA (American Bearing Manufacturers Association) precision grade, indicating a maximum spherical deviation of 100 millionths of an inch (2.54 µm). This level of accuracy ensures even load distribution, reduced vibration, and longer service life compared to lower-grade balls used in non-precision applications.
316 stainless steel contains 2–3% molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion. This makes 316 the preferred choice for marine environments, salt-spray exposure, chemical processing, and food or pharmaceutical equipment where 304 may corrode prematurely.
316 stainless steel is widely accepted in food-grade and pharmaceutical applications due to its corrosion resistance and non-reactive surface. However, always verify compliance with your specific regulatory requirements (e.g., FDA, EU food contact regulations) before use in certified production environments.
Yes — provided you select the correct diameter. These balls are manufactured to standard metric and imperial fractional dimensions used in ABMA/ISO bearing specifications. Confirm the rolling-element diameter specified in your bearing's datasheet matches the variant you select.
For single-unit repairs or prototyping, the 1–5 Pcs options provide cost-effective access without over-ordering. For production runs or stocking purposes, bulk packs of 100–3,000 pieces offer a lower per-unit cost. Select the quantity that matches your projected usage to minimise waste and handling.
The balls feature a bright, smooth surface finish with a typical Ra (average roughness) of ≤ 0.05 µm. This finish reduces friction in rolling contact, resists contamination build-up, and maintains dimensional accuracy over the service life of the assembly.
