52100 bearing steel round bar is a high-carbon chromium bearing steel widely used for rolling bearing components and wear-resistant precision parts. It offers high hardness, good wear resistance and excellent rolling contact fatigue performance after proper heat treatment. 52100 round bar is commonly supplied annealed for machining and can be further hardened for bearing races, balls, rollers, shafts and precision mechanical parts.
Materials can be cut to required sizes according to customer specifications or project needs.
Different surface finishes can be supplied according to product type and application requirements.
Processing services such as cutting, machining, heat treatment or surface finishing can be arranged upon request.
Products are packed for international transportation with flexible delivery support for global buyers.
For high-hardness, highly wear-resistant bearings and precision rolling components.
Suitable for ball bearings, roller bearings, bearing rings, precision rolling elements, track rollers, mechanical transmission bearing components, and more. Ideal for applications requiring resistance to rolling contact fatigue and high wear over the long term.| Item | Typical Information |
| Product Name | 52100 Bearing Steel Round Bar |
| Equivalent Grades | AISI 52100 / 100Cr6 / EN 1.3505 / SUJ2 / EN31 |
| Product Form | Round bar, forged bar, peeled bar, ground bar |
| Standard Reference | ASTM A295, EN ISO 683-17, JIS G4805 or customer specification |
| Supply Condition | Annealed, spheroidized annealed, hot rolled, forged |
| MOQ | Usually 1 ton or negotiable for stock diameters |
| Application | Bearings, rollers, balls, races, precision wear parts |
| Property | Typical Range / Note |
| Annealed Tensile Strength | Often around 570–720 MPa depending on condition |
| Hardened Hardness | Commonly about 60–66 HRC after proper heat treatment |
| Elastic Modulus | About 190–210 GPa |
| Key Property | High wear resistance and rolling contact fatigue resistance |
| Note | Final properties depend on heat treatment and size |
| C | Si | Mn | Cr | P | S | Fe |
| 0.93–1.05 | 0.15–0.35 | 0.25–0.45 | 1.35–1.60 | ≤0.025 | ≤0.025 | Balance |
Q: What is 52100 bearing steel?
A: 52100 is a high-carbon chromium alloy steel (UNS G52986) widely used for anti-friction bearings. It contains approximately 1.0% carbon and 1.5% chromium, providing through-hardening capability and excellent wear resistance after quenching and tempering.
Q: What standards does your 52100 round bar comply with?
A: Our 52100 bearing steel round bar is manufactured and tested in accordance with ASTM A295 (Standard Specification for High-Carbon Anti-Friction Bearing Steel) and SAE J403 chemical composition requirements. Full MTC is provided with every shipment.
Q: What sizes and finishes are available?
A: We supply 52100 round bars ranging from 6mm to 300mm in diameter. Standard finishes include hot-rolled, forged, peeled (turned), and precision ground. Cut-to-length service is available per customer specification.
Q: What are typical applications of 52100 bearing steel?
A: 52100 is primarily used for ball and roller bearing components — bearing balls, tapered rollers, cylindrical rollers, inner and outer races, and bearing rings. It also finds use in high-wear machine parts, tooling, bushings and precision shafts requiring high hardness and fatigue resistance.
Q: What is the typical hardness of 52100 after heat treatment?
A: After proper quenching and low-temperature tempering, 52100 achieves a surface hardness of approximately 60–65 HRC, with a uniform through-hardened microstructure ideal for rolling contact fatigue applications.
