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52100 Bearing Steel Round Bar
xxheise
52100 Bearing Steel Round Bar is a high-carbon, high-chromium through-hardening steel manufactured to ASTM A295 / SAE J403 standards. It delivers excellent surface hardness, superior wear resistance and high rolling contact fatigue strength — making it the industry standard for rolling-element bearing components including balls, rollers, races and bearing rings. Supplied in hot-rolled, forged, peeled or ground finish with full mill test certification.
WhatsApp ：8613052238878
Email ：elena@shengxisteel.com

- PRODUCT PARAMETERS -

Product Attributes:


Item

Details

Product name

52100 Bearing Steel Round Bar

Material

ASTM A295, SAE J403, UNS G52986

Diameter

6-300mm, or as your request

Standard

ASTM A295/A295M, SAE J403

Technique

Hot rolled, Forged, Peeled, Precision ground

Application

Ball bearings, roller bearings, bearing rings, bushings, precision shafts, high-wear machine components


Product Parameters


Item

Details

Grade

52100

Standard

ASTM A295/A295M, SAE J403

Type

High-carbon chromium through-hardening bearing steel

Product

Hot-rolled round bar, forged bar, peeled bar, precision ground bar

Application

Ball bearings, roller bearings, bearing rings, bushings, precision shafts, high-wear machine components

Explanation

52100 is a high-carbon chromium anti-friction bearing steel supplied in spheroidized annealed condition. After quenching and low-temperature tempering, it achieves 60–65 HRC surface hardness with excellent wear resistance and rolling contact fatigue strength.


Chemical Composition (wt.%)


Carbon C

Silicon Si

Manganese Mn

Chromium Cr

Phosphorus P

Sulfur S

0.98~1.10

0.15~0.35

0.25~0.45

1.30~1.60

≤0.025

≤0.025


Mechanical Properties


Condition

Diameter (mm)

Details


Explanation

Annealed (as-supplied)

≤150

Hardness (HB)

≤217

Spheroidized annealed, machinable

Quenched & Tempered

≤150

Hardness (HRC)

60~65

After oil quench + low temp temper


Product Selling Points


High-purity bearing steel round bar with uniform grain structure, high hardness and excellent wear resistance after heat treatment, ideal for manufacturing bearing rings, balls and rollers.

Fine carbide distribution delivers superior contact fatigue strength, effectively extending service life under high-load and high-speed operating conditions.

Strictly produced per ASTM A295 / SAE J403 standard, stable chemical composition and consistent mechanical performance for precision-bearing production.

Good machinability in annealed condition, support custom cut-to-length service, suitable for various precision mechanical part processing.

Complete mill test certificates are available, rigorous quality inspection ensures stable quality for automotive, machinery and industrial bearing applications.


- FACTORY DISPLAY -

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We have our own independent factory which can provide one-stop service for steel cutting, forming and surface treatment. The factory has a strict quality inspection system and various precision testing instruments, and has passed all the third party quality tests such as SGS, BV and CE.

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【 OUR CERTIFICATIONS 】

- CUSTOMER VISITS -

We are listed as a high-quality supplier by many overseas customers andforeign trade companies.

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- PRODUCTION AND PROCESSING -

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- PACKING & DELIVERY -

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- FAQ -

Q1. What is 52100 bearing steel?

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.

Q2. What standards does your 52100 round bar comply with? 

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.

Q3. What sizes and finishes are available? 

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.

Q4. What are typical applications of 52100 bearing steel? 

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.

Q5. What is the typical hardness of 52100 after heat treatment? 

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.


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