Brass Balls
Ball Bearing
Non-Magnetic, Corrosion-Resistant, and Visually Appealing
Brass balls from Atlas Ball & Bearing are manufactured from high-quality CuZn37 (CW508L / CZ108) material — also known as common brass. They combine excellent corrosion resistance, good strength, and a bright, attractive finish, making them ideal for both functional and decorative applications.
Used widely across plumbing, electrical, and marine sectors, brass offers an excellent balance between machinability, durability, and visual appeal.
150
Precision Ball Diameter
Material Overview
| Property | Details |
|---|---|
| Material Name | Brass (CuZn37) |
| Specification Equivalents | BS EN CW508L · Old BS CZ108 · DIN CuZn37 · UNS C27200 |
| Composition (%) | Cu 62.0–64.0 · Ni ≤ 0.3 · Al ≤ 0.05 · Pb ≤ 0.1 · Fe ≤ 0.1 · Sn ≤ 0.1 · Zn Remainder |
| Hardness | 120–160 HB |
| Tensile Strength | 275 MPa |
| Modulus of Elasticity | 103.4 GPa |
| Thermal Conductivity | 116 W/m·K (at 20 °C) |
| Thermal Expansion | 20.5 × 10⁻⁶ /°C (at 20–300 °C) |
| Specific Gravity | 8.44 g/cm³ |
| Melting Point | 916 °C |
| Magnetic Properties | Non-magnetic |
| Grades Available | G200 · G500 · G1000 |
Key Benefits
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Good corrosion resistance in air and fresh water environments.
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Non-magnetic, ideal for sensitive or electrical assemblies
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Excellent machinability — easy to polish, drill, or plate
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Attractive appearance for decorative and architectural use
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Good thermal and electrical conductivity
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Cost-effective compared to other non-ferrous materials
Typical Applications
Brass balls are a preferred choice where aesthetics, non-magnetism, and corrosion resistance are key. Common applications include:
Non-return and check valves
Plumbing and heating fittings
Electrical conductors and connectors
Marine hardware (where appropriate alloys are selected)
Decorative architectural components
Precision instruments and non-ferrous mechanisms
Manufacturing & Supply
We are capable of manufacturing and supplying loose brass 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.
Grades and Quality
Atlas Ball & Bearing supply brass balls in standard precision grades:
G200, G500, and G1000 (other tolerances available upon request)
Supplied polished, unpolished, or plated depending on end use
Full material certification and traceability available
Manufactured under strict quality control to ensure dimensional accuracy and finish
Why Atlas Ball & Bearing?
UK-based supplier with decades of experience in non-ferrous precision balls
Custom manufacturing for size, tolerance, and finish
Technical support to recommend the most suitable alloy
Fast and reliable UK & international delivery
Related Materials
For heavier-duty or marine-grade applications, you may also consider:
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!