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Tel: 860-571-3602  |

Stainless Steel Balls: AISI 304/302 (18-8)

AISI 304/302 stainless steel balls.

AISI 304/302 Stainless Steel Balls Specifications


Carbon Nickel Chromium Manganese Silicon  Phosphorus Sulfur
0.08% max. 8% – 10.5% 18% – 20% 2.0% 1.0% 0.0045% 0.30% max


Carbon Nickel Chromium Manganese Silicon  Phosphorus
0.15% max. 8% – 10.5% 17% – 19% 2.0% 1.0% 0%

View Sizes, Grades, and Tolerance


Precision AISI 304/302 stainless steel balls Type 18-8 are used when conditions require corrosion performance and toughness not available in hardenable stainless steels. Principal applications are in couplings, valves and pumps.


Low magnetic permeability: annealed, 1.003; cold worked, 1.10; severely cold worked, 10.0. High tensile strength at elevated temperatures. 18-8 stainless steel work-hardens rapidly. AISI 304/302 stainless steel balls of this material are passivated.

Corrosion Resistance

Type 18-8 stainless steel balls resist attack by oxidizing solutions, foodstuffs, sterilizing solution and most organic chemicals. They are susceptible to attack by halogen acids and moderately resistant to the sulphur acids.

Typical Hardness

Annealed – Rockwell B 75-95. Not annealed – Rockwell C 25-39.

Ball Sizes

Available in sizes from 1.5mm to 50.8mm in grades 50 through 1000.

Precision AISI 304/302 stainless steel balls are a Hartford specialty, but if you’re looking for a cost-effective alternative, view our precision glass balls.

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