Stainless Steel Balls
Ball Bearing
Precision Balls in All Materials and Grades
Atlas Ball and Bearing provides a comprehensive range of stainless steel balls, offering superior durability, corrosion resistance, and performance for various applications.
Our stainless steel balls are available in multiple grades to meet the diverse needs of industries including:
- Cosmetics
- Aerosols
- Nuclear components
- Aerospace
- Bearing rolling elements
- Mechanical fluid seals
- Linear motion
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Precision Ball Diameter
Martensitic Stainless Steel Balls
- Magnetic · High Strength · Wear Resistant
AISI 416
A free-machining martensitic stainless steel with moderate corrosion resistance and excellent machinability, making it ideal for valve components, fasteners, and pump parts in demanding applications.
AISI 440C
A high-carbon stainless steel with the greatest hardness and tensile strength gives fair corrosion resistance against fresh water, steam, petrol and alcohol. Commonly used in high precision bearings and gauges.
AISI 420
The most widely used martensitic stainless steel, offering excellent hardness and fair corrosion resistance against water, steam, petrol, and alcohol. Used in bearings, valves, and connectors.
AISI 420C
A high-carbon AISI 420, providing increased hardness, superior wear resistance, and enhanced durability. Suitable for bearings, high-stress components, and industrial-grade applications.
Ferritic Stainless Steel Balls
- Magnetic · Corrosion Resistant · Non-Hardenable
AISI 430
Ferritic non-heat treatable stainless steel. Good corrosion and oxidation resistance. Weldable with good thermal conductivity. Commonly used in heat exchangers, scientific instruments an nail polish agitators
AISI 430F
A sulphur-enhanced AISI 430, offering improved machinability while maintaining corrosion resistance, commonly used in fasteners, shafts, and precision medical instruments requiring enhanced durability.
Austenitic Stainless Steel Balls
- Non-Magnetic · Excellent Corrosion Resistance
AISI 302
Offers high strength and good corrosion resistance. Commonly used in food processing equipment, marine applications, and chemical processing.
AISI 304
The standard stainless steel known for its excellent corrosion resistance and versatility. Used in food processing, medical devices, and chemical applications.
AISI 304L
A low-carbon version of 304, ideal for welding applications. Used in piping systems, heat exchangers, and brewing equipment.
AISI 316
Offers superior corrosion resistance. Commonly used in surgical implants, marine hardware, and industrial equipment.
AISI 316L
A low-carbon 316, providing enhanced weldability. Used in pharmaceutical processing, marine environments, and food-grade applications.
AISI 321
A titanium-stabilised alloy resistant to intergranular corrosion. Used in aerospace, high-temperature piping, and expansion joints.
AISI 316Ti
Titanium-stabilised stainless steel with improved high-temperature strength. Ideal for exhaust systems, heat exchangers, and chemical processing equipment.
AISI 316LVM
Vacuum-melted version of 316L, ensuring high purity and biocompatibility. Used in medical implants, orthopaedic components, and surgical instruments.
AISI 904L
A super-austenitic stainless steel with exceptional corrosion resistance. Commonly found in acid processing, offshore applications, and pharmaceutical equipment.
Precipitation Hardening Stainless Steel Balls
- High Strength · Excellent Corrosion Resistance
AISI 630 (17/4 PH)
A high-strength, corrosion-resistant stainless steel used in aerospace, medical instruments, and high-performance bearings.
AISI 631 (17/7 PH)
A precipitation-hardened stainless steel with enhanced flexibility. Used in industrial springs, fasteners, and aerospace components.
13-8 Vim-Var
A vacuum arc remelted stainless steel with improved toughness and strength. Used in structural aircraft components, defence applications, and high-load bearings.
Duplex & Super Duplex Stainless Steel Balls
- Balanced Strength & Corrosion Resistance
AISI 329
A duplex stainless steel that balances strength and corrosion resistance. Used in marine environments, chemical processing, and desalination plants.
F44 (S31254)
A super-austenitic stainless steel with high molybdenum content for aggressive environments. Used in offshore oil and gas, desalination, and pulp and paper industries.
F51 (S31803)
A duplex stainless steel combining high strength and corrosion resistance. Used in chemical processing, marine, and structural applications.
F53 (S32750)
A super-duplex stainless steel known for its exceptional strength and corrosion resistance. Commonly used in seawater handling, pressure vessels, and offshore structures.
F55 (S32760)
A high-performance super-duplex stainless steel ideal for extreme environments. Used in chemical tankers, marine propellers, and deep-sea applications.
Nitrogen-Enhanced Stainless Steel Balls
- Superior Wear & Galling Resistance
Nitronic 32
A wear-resistant, high-strength stainless steel with good corrosion resistance. Used in marine applications, conveyor systems, and automotive components.
Nitronic 50
Offers higher corrosion resistance than 304 and 316, with enhanced strength. Commonly used in pump shafts, seawater applications, and nuclear components.
Nitronic 60
Known for its excellent galling resistance and wear properties. Used in valve seats, marine equipment, and industrial bearings.
Cronidur 30
A high-nitrogen stainless steel offering extreme wear and corrosion resistance. Used in aerospace bearings, high-performance valves, and precision instruments.
Medical & Biocompatible Stainless Steel Balls
- Nickel-Free · High Purity · Surgical Grade
Biodur 108
A biocompatible stainless steel ideal for medical applications, including orthopaedic implants and surgical tools.
17/15 Ni Free
A nickel-free stainless steel designed for biomedical and specialised industrial applications. Commonly used in medical implants, surgical tools, and precision engineering components.
Manufacturing & Supply
We are capable of manufacturing and supplying loose stainless steel balls in nearly every variation of grade, maintaining an extensive stock with sizes ranging from 0.2mm to 150mm in diameter.
Please feel free to rate our products and service or send us your comments by using our form opposite →
Additionally, we offer a bespoke ball manufacturing service, which follows the same process controls and traceability but uses a customer’s own material. For further details, please email us or call +44 (0) 1922 710515.
Applications of Stainless Steel Balls
Our stainless steel balls are used in various industries, including:
- Aerospace – Precision components for aircraft and spacecraft.
- Automotive – Bearings and mechanical components.
- Medical – Surgical instruments and implants.
- Industrial – Valves, pumps, and bearings.
- Marine – Corrosion-resistant solutions for harsh environments.
- Cosmetics – Used in mixing applications, such as agitator balls in nail polish bottles.
- Aerosols – Stainless steel balls help mix and disperse aerosol contents efficiently.
- Nuclear Components – Certain grades like AISI 440C and Cronidur 30 offer high strength and corrosion resistance for nuclear applications.
- Bearing Rolling Elements – Essential for high-performance ball bearings in industrial and mechanical applications.
- Mechanical Fluid Seals – Provides durability and resistance to wear in pumps and sealing systems.
- Linear Motion – Used in guide rails, ball screws, and precision motion control applications.
Useful terms and definitions
Batch or Lot:
A defined quantity of balls manufactured under conditions presumed to be uniform and which is considered an entity.
Nominal Ball Diameter:
The diameter value that is used for the general identification of a ball size.
Single Ball Diameter:
The distance between two parallel planes tangential to the actual ball surface.
Diameter Tolerance per Batch:
The allowed difference between the smallest measured ball diameter and the largest ball diameter within the same batch or lot quantity.
Sphericity:
A measure of roundness expressed as the difference between the measured roundness of a ball and a theoretically perfectly round ball.
Surface Finish or Roughness:
A measure of the texture of a surface. It is quantified by the vertical deviations of the actual surface from its ideal form. If these deviations are large, the surface is rough; if they are small, the surface is smooth.
Ball Grades
| Grade | Diameter Tolerance per Ball | Sphericity | Diameter Tolerance per Unit Container | Basic Diameter Tolerance | Maximum Surface Roughness Micro | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Inch | µ | Inch | µ | Inch | µ | Inch | µ | Inch | µ | |
| 3 | .000003 | 0.076 | .000003 | 0.076 | .000005 | 0.127 | ±.00003 | ± 0.076 | 0.5 | 0.013 |
| More details about Grade 3... | ||||||||||
| 5 | .000005 | 0.127 | .000005 | 0.127 | .00001 | 0.25 | ±.00005 | ± 0.127 | 0.8 | 0.02 |
| More details about Grade 5... | ||||||||||
| 10 | .000010 | 0.25 | .000010 | 0.25 | .00002 | 0.51 | ±.0001 | ± 2.5 | 1.0 | 0.025 |
| More details about Grade 10... | ||||||||||
| 15 | .000015 | 0.38 | .000015 | 0.38 | .00003 | 0.76 | ±.0001 | ± 2.5 | 1.2 | 0.03 |
| More details about Grade 15... | ||||||||||
| 25 | .000025 | 0.63 | .000025 | 0.63 | .00005 | 1.27 | ±.0001 | ± 2.5 | 1.5 | 0.038 |
| More details about Grade 25... | ||||||||||
| 50 | .00005 | 1.27 | .00005 | 1.27 | .0001 | 2.5 | ±.0002 | ± 5 | 3.0 | 0.075 |
| More details about Grade 50... | ||||||||||
| 100 | .0001 | 2.5 | .0001 | 2.5 | .0002 | 5 | ±.0005 | ± 5 | 5.0 | 0.125 |
| More details about Grade 100... | ||||||||||
| 200 | .0002 | 5 | .0002 | 5 | .0004 | 10 | ±.0010 | ± 10 | 8.0 | 0.2 |
| More details about Grade 200... | ||||||||||
| 300 | .0003 | 7.5 | .0003 | 7.5 | .0006 | 15 | ±.0015 | ± 37.5 | N/A | N/A |
| More details about Grade 300... | ||||||||||
| 500 | .0005 | 12.5 | .0005 | 12.5 | .001 | 25 | ±.002 | ± 50 | N/A | N/A |
| More details about Grade 500... | ||||||||||
| 1000 | .001 | 25 | .001 | 25 | .002 | 50 | ±.005 | ± 125 | Not Applicable | Not Applicable |
| More details about Grade 1000... | ||||||||||
| 2000 | .002 | 50 | .002 | 50 | .004 | 100 | ±.005 | ± 125 | N/A | N/A |
| More details about Grade 2000... | ||||||||||
Sample Our Work!
Take the first step towards precision and quality with our expert services. At Atlas Ball & Bearing, we’re committed to delivering top-notch precision balls and rollers for a wide range of industries, including gas, oil, medical, and transportation. Our dedicated team is ready to assist you with custom solutions tailored to your specific needs. Experience the Atlas Ball & Bearing difference now!