Precision Hardened Balls
Precision Hardened Balls
High-Strength, Wear-Resistant Balls for Demanding Applications
At Atlas Ball, we manufacture and supply precision hardened balls engineered for high performance in demanding applications. Manufactured from premium steel alloys and heat-treated to maximise strength and durability, our hardened balls are produced to ISO 3290 / AFBMA standards to ensure exceptional quality and accuracy.
What Are Precision Hardened Balls?
Precision hardened balls are spherical components made from steel or other alloys that have been heat-treated to achieve superior hardness, wear resistance, and load capacity. Combined with tight tolerances and a high-quality surface finish, these balls provide long-lasting reliability in critical engineering applications such as bearings, valves, aerospace systems, and automotive assemblies.
150
Precision Ball Diameter
Precision Hardened Balls
Applications of Precision Hardened Balls
Atlas Ball supplies hardened precision balls across multiple industries, including:
Ball Bearings
Used in high precision ball bearings and linear bearings, hardened balls deliver smooth operation, low friction, and extended service life.
Automotive
From gearboxes and engines to steering systems, precision hardened balls withstand heavy loads and high speeds in demanding automotive environments.
Aerospace & Defence
Our hardened balls meet the stringent requirements of aerospace and defence equipment, where reliability and strength under extreme conditions are vital.
Valves & Pumps
Hardened precision balls provide sealing and flow control in industrial valves, hydraulic pumps, and fluid systems.
Robotics & Medical Devices
In robotics, prosthetics, and medical instruments, hardened balls ensure precise, smooth movement with consistent performance.
Precision Hardened Balls
Characteristics of Precision Hardened Balls
Materials
Chrome Steel (AISI 52100) – the most common choice for high-strength, high-durability applications.
Stainless Steel – corrosion-resistant for aerospace, medical, and marine uses.
Tungsten Carbide – extreme hardness and wear resistance for heavy-duty applications.
Ceramic Options – lightweight, non-magnetic, and highly wear-resistant.
Hardness
- Typically hardened to 60–67 HRC (Rockwell C) depending on material and application.
Sizes & Grades
Available in diameters from 0.3 mm to 150mm.
Supplied in grades from G3 (ultra-high precision) to G2000, with tighter grades offering higher roundness, smoother finishes, and greater consistency.
Surface Finish
Maximum surface roughness as low as 0.5 µm Ra for high-grade balls.
Precision manufacturing ensures excellent sphericity and dimensional stability.
Contact Us
Contact Atlas Ball today to discuss your requirements for precision hardened balls. Our team of specialists will help you select the right materials, sizes, and grades to meet your exact application.
Why Choose Atlas Ball & Bearings?
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Supplier of precision hardened balls to industries worldwide.
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Full range of materials, sizes, and grades available.
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Balls manufactured to international standards for accuracy and quality.
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Bespoke solutions available to meet your specific engineering requirements.
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 Bearing Grade Chart
| 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!