Stainless Steel Balls: 300 & 400 Series
At Acraball, we supply precision stainless steel balls in both the 300 & 400 Series grades
We offer balls in sizes ranging from 0.010″ to 8.0″ diameter, with grades from Grade 5 to Grade 1000 available


300 Stainless Steel Series
400 Stainless Steel Series
- Most Common Grades: 302 & 316
- Non-magnetic in annealed condition
- Excellent corrosion resistance to most chemicals, acids, and salt water
- Applications: Cosmetics, Food processing equipment, marine, medical, chemical, and general industrial environments
- Temperature resistance: Good at both high and low temperatures
- Machineability: May be machined, drilled, and tapped
- Hardness : 25-30 HRc
- Most Common Grades: 420 & 440-C
- Magnetic
- Good wear resistance and higher hardness than 300 Series
- Corrosion resistance: Moderate—suitable for mild environments but not as high as 300 Series
- Applications: Bearings (anti-friction & precision), valves, automotive, food, medical, oil refining, etc.
- 440C: Often used for high precision bearings due to its hardness and wear resistance
- Machineability: Can be drilled by EDM and modified by grinding
Grade Options
Available in precision grades from Grade 5 (ultra-precision) to Grade 200 (industrial use), including the following popular grades:
- Grade 5
- Grade 10
- Grade 25
- Grade 50
- Grade 100
- Grade 200

Our service capabilities include
- The manufacturing of specials, including micro-drilling & tapping.
- Machine shop services for grinding & resizing balls to your exact specifications.
- Customer machine shop alterations of balls for any application.
- Customer alterations & manufacturing of non-standard bearings.
- Special surface finishes & coatings
- Engineering support for the resolution of technical issues.
Need help with your precision ball project?
Have specific requirements or need help choosing the right precision ball? Send Us a Message
We can offer balls in a size range of 0.010″ to 8.0″ dia. and in any grades from Grade 5 to Grade 1000
Available Sizes: 0.4mm to 101.6mm (other sizes on request)
Finish: Highly polished, ultra-precision tolerance, surface roundness & micro-finish
Special Services
- Custom diameters and tolerances
- Special surface finishes and coatings
- Rapid shipping and large inventory
Contact us for a quote on our chrome steel balls and services.