Product Overview

AISI 52100 chrome steel balls are precision bearing steel balls produced from high-carbon chromium alloy steel. Compared with low carbon steel balls, chrome steel balls provide higher hardness, stronger wear resistance and better performance in repeated rolling contact. Compared with stainless steel balls, they usually offer better hardness and bearing performance at a more economical cost, but they do not provide true corrosion resistance.

For industrial buyers, AISI 52100 is the standard choice when the application requires dimensional precision, stable surface quality, rolling fatigue resistance and long service life under high-contact stress. These balls are widely used in bearings and motion systems, as well as in automotive, mechanical, hardware, valve, pump and conveyor applications where hardened bearing steel performance is required.

Material Selection & Technical Positioning

AISI 52100 is a low-alloy high-carbon chromium steel commonly used for ball and roller bearing components. After controlled heat treatment, it becomes through-hardened and develops a martensitic structure suitable for high wear resistance and repeated mechanical contact.

The correct industry terminology includes: AISI 52100 chrome steel balls, 100Cr6 balls, SUJ2 steel balls, GCr15 steel balls, bearing steel balls, chrome bearing balls, high carbon chromium steel balls and through-hardened bearing steel balls. The word “chrome” in this product refers to chromium-bearing steel material, not decorative chrome plating.

Chrome steel balls are best selected for dry, lubricated or protected mechanical assemblies. They should not be described as stainless or corrosion-resistant. For wet, marine, chemical, outdoor or food-contact environments, SDBALLS should review stainless steel, ceramic, plastic or plated alternatives according to the working condition.

Technical Specifications

Property	Typical Value / Range
Material	AISI 52100 / 100Cr6 / SUJ2 / GCr15
International Equivalents	100Cr6 / 1.3505 / SUJ2 / GCr15 / 100C6
Diameter	0.5 mm – 300.0 mm
Precision Grade	G10-G1000, including intermediate grades
Hardness	HRC 60-66 typical
Density	Approx. 7.80 g/cm3
Young’s Modulus	Approx. 210 GPa
Tensile Strength	Approx. 2500-2600 MPa
Magnetism	Magnetic
Corrosion Resistance	Limited; not stainless steel. Rust-preventive oil, plating or stainless alternatives may be required.
Surface Finish	Polished, lapped, oiled, dry, or special surface finish upon request

Chemical Composition Reference

The following table gives common reference composition ranges for AISI 52100 / 100Cr6 bearing steel balls. Final material specification should follow the agreed standard, drawing, purchase order and inspection requirement.

Grade	C %	Si %	Mn %	P max %	S max %	Cr %	Ni max %	Mo max %	Cu max %
AISI 52100	0.95-1.05	0.15-0.35	0.25-0.45	0.025	0.025	1.40-1.65	0.30	0.08	0.20

International Grade Equivalents

AISI 52100 chrome steel balls are globally specified under several equivalent or closely related bearing steel designations. This helps international buyers match drawings, material standards and supplier documentation.

USA	Germany / EN	France	UK	Italy	Russia	China	Japan
AISI 52100	1.3505 / 100Cr6	100C6	534A99	100Cr6	9Ch1	GCr15	SUJ2

Heat Treatment, Hardness & Performance

AISI 52100 chrome steel balls are normally through-hardened by controlled heat treatment. This gives the ball a high and relatively uniform hardness through the cross-section, unlike case-hardened low carbon steel balls that have a hardened outer layer and softer core.

• Typical hardness: HRC 60-66 after heat treatment.
• Performance focus: high wear resistance, good load-carrying capacity and rolling contact durability.
• Best working condition: dry or lubricated mechanical contact with controlled corrosion exposure.
• Important limitation: chrome steel can rust if exposed to moisture or corrosive media without proper protection.

Applications & Application Fit

AISI 52100 chrome steel balls are suitable for high-wear, precision and repeated-contact applications. They should be selected when the buyer needs better hardness, load capacity and service life than low carbon steel balls, but does not require stainless corrosion resistance.

Application	Fit Level	Why It Fits	Buyer Note
Precision bearings	Excellent	High hardness, dimensional precision and bearing-grade material support rolling fatigue performance.	Confirm grade, roundness, surface roughness and lubrication condition.
Automotive components	Very good	Suitable for repeated mechanical contact in steering, transmission, couplings and related assemblies.	Confirm PPAP-style documentation and batch traceability if required.
Linear motion systems	Very good	Stable geometry and wear resistance support smooth motion and repeatability.	Use tighter grades for precision rails and motion assemblies.
Pumps and check valves	Good	High hardness supports seating, wear resistance and repeated contact.	Use stainless or ceramic balls if corrosion or chemical exposure is present.
Castors, conveyors and rollers	Good	Good wear resistance for rolling contact in industrial handling systems.	Confirm load, lubrication and environmental exposure.
Locks, sliders and hardware	Good	Magnetic hardened steel supports durable contact in mechanical hardware.	Lower grades may be sufficient for cost-sensitive hardware.
Food grinding systems	Conditional	Wear resistance may be useful in some systems.	Confirm food-contact requirements; stainless, ceramic or glass may be more suitable in many food applications.
Wet, marine or corrosive environments	Limited	Chrome steel is not stainless and can rust.	Recommend stainless steel, ceramic or plated alternatives.

Material Selection Guide

Material Option	Typical Strength	Limitation	When to Recommend
AISI 52100 chrome steel balls	High hardness, precision, wear resistance and bearing performance	Not stainless; can rust without protection	Bearings, automotive components, linear motion, pumps, valves, precision mechanisms
AISI 1085 high carbon steel balls	Through-hardened and economical for general wear applications	Lower bearing performance than 52100 in demanding precision use	Semi-precision mechanisms, furniture bearings, castors and general industrial use
AISI 1010/1015 low carbon steel balls	Economical with case-hardened surface and tougher core	Lower precision and fatigue capability than chrome steel	Drawer slides, hardware, castors, conveyors and cost-sensitive assemblies
Stainless steel balls	Better corrosion resistance and clean appearance	Higher cost and grade-dependent hardness	Wet, food-contact, medical, marine or hygiene-sensitive environments
Ceramic balls	Low density, non-metallic, strong corrosion and temperature advantages	Higher cost and application-specific brittleness considerations	Chemical, high-speed, electrical insulation or special bearing applications

Manufacturing & Process Control

Chrome steel ball production requires strict control from raw material through final inspection. SDBALLS manufacturing control can include raw material selection, wire drawing, cold heading, flashing, heat treatment, hard grinding, lapping, polishing, cleaning, rust-preventive oiling, inspection and export packing.

For high-precision orders, the key control points include material consistency, heat-treatment stability, hardness uniformity, diameter variation, roundness, surface finish, lot separation and packing cleanliness. For distributor and OEM projects, SDBALLS can also discuss labeling, batch traceability and repeated-order consistency.

Quality Control & Inspection

Quality control for AISI 52100 chrome steel balls should focus on the performance factors that matter in rolling contact and mechanical assemblies: size accuracy, roundness, hardness, surface appearance and packing protection.

• Diameter and lot variation inspection according to agreed grade.
• Roundness, surface appearance and visual defect control.
• Hardness inspection after heat treatment.
• Surface finish and polishing quality inspection when specified.
• Material verification and international equivalent confirmation when required.
• Rust-preventive oiling and packing condition inspection before shipment.
• Inspection reports, third-party testing, RoHS request or PPAP-style documentation can be discussed for OEM programs.
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Packing Options

SDBALLS can supply chrome steel balls in export-ready packing according to quantity, diameter, weight and buyer handling requirements. Common options include small bags, inner boxes, cartons, plastic pails, steel drums, woven bags, pallets and customized OEM labels. Rust-preventive oil and sealed packing should be considered when long ocean transit, humid storage or extended warehouse time is expected.

Packing Type	Suitable For	Buyer Note
Bulk bag / carton	General industrial orders and distributor stock	Economical and easy to handle for small to medium sizes.
Plastic pail / steel drum	Heavy bulk balls and repeated warehouse handling	Useful for larger quantities and mechanical handling.
Palletized export packing	Ocean shipment and container loading	Improves transport stability and warehouse efficiency.
Customized OEM labeling	Distributor and private-label programs	Can include material, size, grade, lot number, quantity and customer brand details.

How to Specify for Quotation

To quote AISI 52100 chrome steel balls accurately, please confirm the technical and commercial details below. Complete information helps reduce misunderstandings and improves quotation speed.

• Material designation: AISI 52100, 100Cr6, SUJ2, GCr15 or drawing-specific equivalent.
• Diameter in mm or inch, including tolerance requirement if available.
• Precision grade such as G10, G16, G20, G40, G100, G500 or G1000.
• Required hardness range and any special heat-treatment requirement.
• Surface finish: polished, lapped, oiled, dry, plated or other treatment.
• Application and working environment, especially load, speed, lubrication and corrosion exposure.
• Quantity, annual demand, packing method and labeling requirement.
• Inspection documents, third-party testing, PPAP-style documents or sample approval needs.
• Destination port, trade term and target delivery schedule.

Technical FAQ

Q: What is the material for chrome steel balls on this page?

A: The material is AISI 52100 high-carbon chromium bearing steel. International equivalents include 100Cr6, 1.3505, SUJ2 and GCr15.

Q: Are chrome steel balls the same as chrome plated balls?

A: No. In this product, chrome steel means chromium-bearing steel material, not a decorative chrome-plated surface. Plating is a separate surface treatment and should be specified separately if required.

Q: What hardness can SDBALLS supply for AISI 52100 chrome steel balls?

A: Typical hardness is HRC 60-66 after heat treatment. If a narrower hardness range is required, it should be confirmed before quotation and sample approval.

Q: Are AISI 52100 chrome steel balls corrosion resistant?

A: They have limited corrosion resistance and are not stainless steel. For rust-sensitive environments, buyers should consider rust-preventive oil, plating, stainless steel balls or ceramic balls depending on the application.

Q: What precision grades are available?

A: Common grades include G10, G16, G20, G28, G40, G48, G80, G100, H200, G500 and G1000. The best grade depends on the application, smoothness requirement, load, speed and cost target.

Q: Can AISI 52100 chrome steel balls be used in bearings?

A: Yes. AISI 52100 is a standard bearing steel material and is widely used for precision bearings and rolling elements. Bearing applications should confirm grade, roundness, surface finish, hardness and lubrication conditions.

Q: Can chrome steel balls replace stainless steel balls?

A: Only when corrosion resistance is not required. Chrome steel offers high hardness and wear resistance, while stainless steel is usually preferred for wet, food-contact, marine, chemical or hygiene-sensitive environments.

Q: What information is needed for a quotation?

A: Please provide material, diameter, precision grade, hardness, surface finish, quantity, application, packing method, inspection document needs, destination and trade term. Drawings or samples are helpful for replacement projects.

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