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Hardened Ultra-Wear-Resistant 440C Stainless Steel Balls
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The best choice for high-performance bearings and valves, these 440C stainless steel balls are among the strongest, hardest, and most wear-resistant we offer. They’re passivated to wash away surface particles that cause rust, and they’re polished to a mirror-like finish that contaminants can’t stick to. The result is balls that stay smooth and stand the test of time—even at temperatures up to 800° F. They’re made to strict ISO 3290 standards for roundness and surface quality.
These balls are magnetic, so you can use them in separators, sensors, and automated handling systems that use magnetic pickup or positioning.
Grade 100—Great for mechanical applications where you don’t need the exacting tolerances of Grade 25.
Grade 25—Precision-ground to tighter tolerances than Grade 100 balls. Use them in high-accuracy assemblies.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Steel Balls
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Multipurpose Low-Carbon Steel—Low-carbon steel balls are our easiest steel balls to machine. They are often used for parts that don’t require high strength, such as knobs. These balls can be surface hardened with heat treating for added wear resistance.
Wear-Resistant 52100 Alloy Steel—High carbon and chromium content makes this 52100 alloy steel extremely hard and resistant to wear. It’s also known as chrome steel. Often used as bearings, these balls are hardened for increased abrasion and impact resistance.
Tight-Tolerance Wear-Resistant 52100 Alloy Steel—The diameter of these balls is held to a precise tolerance. They’re made from 52100 alloy steel, also known as chrome steel, which has high levels of carbon and chromium to make them extremely hard and resistant to wear. Often used as bearings, these balls are also hardened to increase their abrasion and impact resistance.
Dia. | Dia. Tolerance | Heat Treatment | Yield Strength, psi | Mechanical Finish | Hardness | Appearance | Specs. Met | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Multipurpose Low-Carbon Steel | ||||||||||||
| 11/16" | -0.005" to 0.005" | Case Hardened | 44,000 | Tumbled | Rockwell C60 (Extra Hard) | Mirror Like | — | 25 | 96455K117 | 000000 | ||
Wear-Resistant 52100 Alloy Steel | ||||||||||||
| 11/16" | -0.0001" to 0.0001" | Hardened | 295,000 | — | Rockwell C60 (Extra Hard) | Mirror Like | — | 25 | 9528K28 | 00000 | ||
Tight-Tolerance Wear-Resistant 52100 Alloy Steel | ||||||||||||
| 11/16" | -0.00005" to 0.00005" | Hardened | 295,000 | Ground, Polished | Rockwell C60 (Extra Hard) | Mirror Like | ASTM A295 | 1 | 9528K526 | 00000 | ||
