52100 Round Bar for Bearing, Shaft and High-Wear Applications
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52100 Round Bar is a high-carbon chromium alloy steel widely considered for bearing components, rollers, races, shafts and other applications where hardness, wear resistance and fatigue performance are important.
The grade is particularly relevant to manufacturers that machine or process steel bar into precision components.
Industrial buyers may encounter several designations while sourcing the material:
- AISI 52100
- SAE 52100
- EN31
- 100Cr6
- 1.3505
- Bearing Steel 52100
- Chrome Bearing Steel
When purchasing the material, the exact specification should be confirmed rather than relying only on an equivalent-grade name.
A buyer searching Google may be looking for:
- 52100 Round Bar Supplier
- AISI 52100 Round Bar
- SAE 52100 Steel
- EN31 Round Bar
- 100Cr6 Round Bar
- 52100 Bearing Steel
- 52100 Round Bar Price
- 52100 Steel Supplier Mumbai
- 52100 Heat Treatment
- 52100 Hardness
This guide brings those commercial and technical search requirements together in one industrial resource.
Table of Contents
- What is 52100 Round Bar?
- Why is 52100 steel used for bearings?
- AISI 52100 and SAE 52100
- EN31 and 100Cr6 equivalent designations
- 52100 chemical composition
- 52100 mechanical properties
- 52100 hardness
- 52100 wear resistance
- 52100 fatigue performance
- 52100 bearing applications
- 52100 roller applications
- 52100 shaft applications
- 52100 precision components
- 52100 machining
- 52100 heat treatment
- 52100 annealing
- 52100 hardening
- 52100 tempering
- 52100 surface finish
- 52100 Round Bar sizes
- 52100 testing and certification
- 52100 equivalent grades
- 52100 vs EN31
- 52100 vs 4140
- 52100 Round Bar price
- How to buy 52100 Round Bar
- 52100 Round Bar supplier in Mumbai
- Frequently asked questions
- Request a quotation
- Conclusion
What is 52100 Round Bar?
52100 Round Bar is a high-carbon chromium alloy steel supplied in round bar form for demanding mechanical applications.
Its combination of high carbon and chromium contributes to the hardness and wear resistance required for many bearing-related applications.
The material can be processed into components such as:
- Bearing rings
- Bearing races
- Rollers
- Balls
- Shafts
- Pins
- Bushes
- Guide components
- Wear-resistant parts
- Precision mechanical components
The final performance depends heavily on manufacturing process, heat treatment, dimensional accuracy and surface condition.
For this reason, the bar grade alone is only one part of the material-selection process.
Why is 52100 Steel Used for Bearings?
Bearing components operate under repeated rolling and contact loads.
The material therefore needs to withstand:
- Repeated stress
- Surface contact
- Wear
- Friction
- Fatigue
- Dimensional changes
52100 is widely associated with bearing steel because its properties can be developed through appropriate heat treatment and manufacturing processes.
The material is especially relevant where a hardened, wear-resistant steel is required.
However, bearing performance does not depend on material grade alone.
Heat treatment, cleanliness, surface finish, dimensional precision and manufacturing quality are equally important.
AISI 52100 and SAE 52100
AISI 52100 and SAE 52100 are commonly used names for this bearing steel grade.
Industrial enquiries may therefore use either designation.
A purchasing specification might read:
AISI 52100 Round Bar
or
SAE 52100 Bearing Steel Round Bar
For procurement clarity, it is useful to provide the grade along with the applicable standard.
This helps avoid confusion with other high-carbon chromium steels.
EN31 and 100Cr6 Equivalent Designations
52100 is frequently compared with grades such as:
- EN31
- 100Cr6
- 1.3505
These designations are often encountered in international procurement.
However, an “equivalent” grade should not be accepted simply because an online table lists it as equivalent.
The buyer should verify:
- Chemical composition
- Product specification
- Heat-treatment condition
- Mechanical properties
- Dimensional requirements
- Customer specification
For critical bearing or fatigue-loaded components, engineering approval should be obtained before substituting a grade.
52100 Chemical Composition
The chemistry of 52100 is designed around a high-carbon chromium steel composition.
The major alloying elements include:
- Carbon
- Chromium
- Manganese
- Silicon
- Iron
Carbon contributes strongly to hardness after heat treatment.
Chromium contributes to hardenability, wear performance and the material’s overall engineering characteristics.
For an actual purchase, the chemistry should always be verified using the Material Test Certificate for the supplied heat.
Generic composition figures found online should not replace certified material documentation.
52100 Mechanical Properties
Mechanical properties depend on the material condition and heat-treatment process.
Engineers may evaluate:
- Tensile strength
- Yield strength
- Hardness
- Elongation
- Impact behaviour
- Fatigue performance
- Wear resistance
For bearing applications, hardness and fatigue behaviour are particularly important.
However, the required values should be specified according to the actual component and applicable standard.
A supplier should provide certified test information when it is required by the project.
52100 Hardness
52100 is capable of achieving high hardness through suitable heat treatment.
This is one of the reasons it is used for bearing and wear-related components.
The required hardness depends on:
- Component geometry
- Heat-treatment process
- Application
- Required service life
- Customer specification
Rather than specifying one hardness value for every application, buyers should state the required condition or hardness range in the purchase specification.
52100 Wear Resistance
Wear resistance is one of the key characteristics considered when selecting 52100.
The grade is particularly relevant to components where repeated contact occurs.
Examples include:
- Bearing rollers
- Bearing races
- Guide components
- Wear pins
- Rollers
- Precision mechanical parts
The actual wear performance depends on surface hardness, lubrication, contact stress, surface finish and operating conditions.
52100 Fatigue Performance
Rolling-contact components can experience millions of repeated loading cycles.
This makes fatigue performance a major consideration in bearing applications.
52100 is widely associated with bearing applications because appropriate processing and heat treatment can provide the hardness and structural characteristics required for demanding rolling-contact service.
For critical applications, the complete manufacturing process should be controlled rather than evaluating the raw material alone.
52100 Bearing Applications
52100 Round Bar can be used as raw material for manufacturing various bearing components.
Potential applications include:
- Bearing races
- Bearing rings
- Rollers
- Balls
- Bearing shafts
- Precision components
The final manufacturing route may include:
Cutting → Turning → Heat Treatment → Grinding → Finishing → Inspection
Each stage can influence the performance of the final bearing component.
52100 Roller Applications
Rollers may operate under continuous contact and repeated mechanical loading.
52100 can be considered for selected roller applications because it can achieve high hardness and wear resistance after appropriate processing.
Potential applications include:
- Industrial rollers
- Guide rollers
- Cam followers
- Bearing rollers
- Precision rolling components
The application should determine the required hardness and dimensional tolerance.
52100 Shaft Applications
52100 Round Bar can also be used for selected shaft and spindle applications where wear resistance and hardness are more important than the toughness requirements of a general-purpose alloy steel.
Possible components include:
- Small shafts
- Spindles
- Pins
- Axle components
- Wear shafts
- Precision mechanical shafts
For heavily loaded shafts requiring high toughness, engineers should compare 52100 with alternatives such as 4140 or other alloy steels.
52100 Precision Components
Precision manufacturing requires more than the correct chemical composition.
The bar may need to meet requirements for:
- Diameter tolerance
- Straightness
- Surface finish
- Internal quality
- Heat treatment
- Decarburization control
- Dimensional stability
These factors can become especially important when the bar is being converted into a precision bearing component.
52100 Machining
Machining 52100 depends strongly on its supplied condition.
Annealed or spheroidized material is generally easier to machine before hardening.
Machining considerations include:
- Cutting speed
- Feed
- Tool geometry
- Coolant
- Machine rigidity
- Material hardness
After hardening, conventional machining becomes significantly more difficult and grinding or other finishing processes may be required.
The manufacturing route should therefore be planned before purchasing the material.
52100 Heat Treatment
Heat treatment is a critical part of 52100’s final performance.
The process may involve stages such as:
- Annealing
- Heating
- Austenitizing
- Quenching
- Tempering
The actual parameters depend on:
- Bar diameter
- Component geometry
- Required hardness
- Furnace conditions
- Cooling medium
- Applicable specification
Heat treatment should always be performed according to a qualified procedure.
52100 Annealing
Annealing is used to produce a softer and more machinable material condition before subsequent processing.
For bearing steel, spheroidizing treatments may also be used to improve machinability and prepare the microstructure for hardening.
The exact thermal cycle should be selected according to the material specification and manufacturing process.
52100 Hardening
52100 can be hardened through suitable heating and quenching.
The hardening process must be carefully controlled because incorrect heating or cooling can create:
- Distortion
- Cracking
- Undesirable microstructure
- Dimensional changes
- Surface defects
For precision components, heat-treatment control is therefore essential.
52100 Tempering
After hardening, tempering is generally performed to achieve the required balance of hardness and toughness.
The correct tempering temperature depends on the intended final properties.
Industrial buyers requiring a specific hardness should communicate the requirement before production.
52100 Surface Finish
Surface quality is especially important for bearing-related components.
Depending on the application, buyers may require:
- Bright finish
- Peeled finish
- Ground finish
- Turned finish
- Precision ground finish
A precision bearing component may require significantly tighter surface and dimensional requirements than a general engineering shaft.
52100 Round Bar Sizes
52100 Round Bar can be required in a wide range of diameters.
A proper enquiry should include:
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg
Finish: ______
Tolerance: ______
Condition: ______
Standard: ______
For larger or customized sizes, availability should be confirmed before purchase.
52100 Testing and Certification
Industrial buyers may require documentation such as:
- Material Test Certificate
- Chemical analysis
- Mechanical test report
- Hardness test
- Heat-treatment records
- Ultrasonic testing where specified
- Dimensional inspection
- Heat number traceability
- Third-party inspection
For bearing applications, additional internal-quality requirements may apply depending on the customer’s specification.
The required inspection level should therefore be confirmed before ordering.
52100 Equivalent Grades
Commonly searched equivalents include:
- EN31
- 100Cr6
- 1.3505
- AISI 52100
- SAE 52100
However, these should be treated as potentially corresponding grades, not automatic substitutes.
Always compare the relevant standard and chemical requirements before approving an equivalent.
52100 vs EN31
52100 and EN31 are frequently compared in industrial procurement.
Both are associated with high-carbon chromium bearing steels.
However, the exact chemistry, standard and product condition should be checked before treating them as interchangeable.
For international sourcing, the purchase order should ideally specify the required standard rather than relying only on a trade name.
52100 vs 4140
52100 and 4140 are both alloy steels, but they are designed around different engineering requirements.
52100 is strongly associated with:
- Bearings
- High hardness
- Wear resistance
- Rolling-contact fatigue
4140 is commonly selected for:
- Shafts
- Gears
- Bolts
- General machine components
- High-strength engineering applications
If toughness and shock loading are dominant requirements, 4140 may be more appropriate.
If high hardness and rolling-contact performance are dominant requirements, 52100 may be considered.
The application should determine the material.
52100 Round Bar Price
The price of 52100 Round Bar depends on:
- Diameter
- Quantity
- Length
- Surface finish
- Material condition
- Heat-treatment requirements
- Certification
- Testing
- Stock availability
- Market conditions
Therefore, a search for 52100 Round Bar Price Per Kg cannot provide a meaningful industrial quotation without the actual specification.
For an accurate price, send the complete size and quantity requirement.
How to Buy 52100 Round Bar
For a fast quotation, provide:
Material: AISI / SAE 52100
Product: Round Bar
Equivalent designation: EN31 / 100Cr6, if specifically required
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg
Finish: ______
Condition: ______
Hardness: ______
Testing: ______
MTC: Required / Not Required
Application: ______
This allows the supplier to evaluate the technical and commercial requirement correctly.
52100 Round Bar Supplier in Mumbai
For buyers searching for a 52100 Round Bar Supplier in Mumbai, the supplier should be able to understand both the material specification and the intended application.
Before purchasing, confirm:
- Grade
- Standard
- Diameter
- Length
- Surface condition
- Heat-treatment condition
- Testing requirements
- Certification
- Delivery requirement
Manan Steel & Metals supplies engineering steel and alloy products for industrial requirements.
Customers looking for 52100 Round Bar, AISI 52100, SAE 52100 or bearing steel can provide their complete requirement for availability and quotation.
Frequently Asked Questions
What is 52100 Round Bar?
52100 Round Bar is a high-carbon chromium alloy steel commonly used for bearings, rollers, races, shafts and high-wear components.
What is AISI 52100?
AISI 52100 is a high-carbon chromium bearing steel grade widely used for rolling-contact applications.
What is the equivalent of 52100 steel?
Commonly referenced corresponding designations include EN31, 100Cr6 and 1.3505, subject to confirmation against the relevant standard.
Is 52100 bearing steel?
Yes. 52100 is widely associated with bearing steel applications.
Is 52100 harder than 4140?
52100 is capable of achieving high hardness suitable for bearing and wear applications. 4140 is generally selected for a different combination of strength and toughness.
Can 52100 be heat treated?
Yes. Heat treatment is an important part of achieving the desired properties of 52100.
What is 52100 Round Bar used for?
It is used for bearing rings, races, rollers, shafts, pins, wear components and precision mechanical parts.
What is 52100 Round Bar price?
Price depends on size, quantity, finish, condition, testing, certification and market availability.
Where can I buy 52100 Round Bar in Mumbai?
Contact Manan Steel & Metals with your required diameter, length, quantity and specification for availability and quotation.
Request a Quotation
Material: AISI / SAE 52100
Product: Round Bar
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg
Finish: ______
Condition: ______
Hardness: ______
Testing: ______
MTC: Required / Not Required
Application: ______
Manan Steel & Metals
Shop No. 2, Hira Building,
97 Khetwadi Main Road (Nanubhai Desai Road),
Girgaon, Mumbai – 400004,
Maharashtra, India.
Phone: 7977369869
Email: manansteel@gmail.com
Conclusion
52100 Round Bar remains an important material for manufacturers working with bearings, rollers, races and other components where hardness, wear resistance and rolling-contact fatigue performance are important.
Its common identification as AISI 52100, SAE 52100, EN31 and 100Cr6 also makes it a frequent subject of international industrial searches.
For procurement teams, however, an equivalent designation should never replace the actual material specification.
The buyer should clearly identify the required grade, standard, diameter, length, surface condition, heat-treatment condition, hardness and inspection requirements.
This becomes particularly important for precision components where dimensional accuracy, surface quality and heat-treatment control can directly influence component performance.
For companies searching for 52100 Round Bar Supplier, AISI 52100 Round Bar, SAE 52100 Steel, EN31 Round Bar, 100Cr6 Round Bar, Bearing Steel Round Bar, 52100 Price or 52100 Steel Supplier in Mumbai, Manan Steel & Metals can evaluate the required industrial specification and provide availability based on the actual requirement.
Send the complete material and dimensional details for a quotation.
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