Ferrous Alloy Balls

Ball Bearing

High Strength, Impact Resistance & Economical Performance

Atlas Ball and Bearing offers a full range of ferrous alloy balls including chrome steel, carbon steel, and high-speed tool steels. These materials provide excellent load-bearing performance, wear resistance, and affordability—ideal for high-precision and heavy-duty applications.

We supply ferrous alloy balls to industries including:

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150

Precision Ball Diameter

Chrome & Carbon Steel Balls

Chrome Steel

(High Carbon Chromium Steel – AISI 52100)
The industry standard for precision bearing balls. High hardness, excellent wear resistance, and good fatigue life. Used in ball bearings, automotive components, and industrial machinery.

Carbon Steel

(General Purpose)
Cost-effective material for low-precision or low-load applications. Often used in toys, casters, and light-duty bearings.

Carbon Steel (1085)

A high-carbon steel with better wear and strength properties than general-purpose carbon steel. Suitable for moderate-load applications in machinery and hardware.

Carbon Steel (Soft)

Annealed carbon steel offering excellent machinability and ductility. Commonly used where post-processing or forming is required.

High-Speed & Tool Steel Balls

AISI M2

Molybdenum-based high-speed steel known for its high wear resistance and hardness retention at elevated temperatures. Used in cutting tools, punches, and dies.

AISI T1

Tungsten-based high-speed steel with excellent hot hardness. Ideal for tools, hardened gauges, and heavy-duty bearings.

AISI T15

A high-performance tool steel with added cobalt for enhanced hot hardness. Suitable for severe service environments.

AISI T5

Tool steel with high tungsten content offering a balance of hardness and toughness. Used in precision instruments and wear-resistant parts.

AISI S2

Shock-resistant tool steel designed for high impact resistance. Commonly used in impact tools, striking components, and rugged mechanical assemblies.

Manufacturing & Supply

We stock and supply ferrous alloy balls in standard and custom diameters from 0.5mm to 100mm, with various hardness levels and finishes. Balls are available heat-treated, annealed, or machined to order.

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.

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Applications of Ferrous Alloy Balls

Used extensively where strength, wear resistance, and economy matter:

Bearings – Chrome and carbon steel balls are core components in bearing assemblies
Automotive – Engine components, gear systems, steering mechanisms
Power Tools – Impact-resistant tool steel balls for drills and rotary equipment
Aerospace – Precision M2 and T15 balls in control systems and actuators
Industrial – Durable rolling and load-bearing elements

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 Grade Table (Sticky 1st Column)

Ball Grades

Grade	Diameter Tolerance per Ball		Sphericity		Diameter Tolerance per Unit Container		Basic Diameter Tolerance		Maximum Surface Roughness Micro
Grade	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!