Linshang LS252D Hardness Conversion Guide HL, HRC, HB and HV Explained Malaysia
Linshang LS252D Hardness Conversion Guide – HL, HRC, HB and HV Explained Malaysia
When using a portable hardness tester, one question often causes confusion:
Why can one instrument display HL, HRC, HB and HV when these are different hardness testing methods?
The Linshang LS252D Leeb Hardness Tester fundamentally uses the Leeb rebound hardness testing principle. It can then provide hardness values in several supported scales through applicable conversion relationships.
Understanding the difference between measurement and conversion is important for Malaysian QA/QC engineers, manufacturers, heat-treatment companies and maintenance teams.
What Hardness Scales Does the LS252D Support?
The LS252D supports hardness scales including:
HL – Leeb
HV – Vickers
HB – Brinell
HS – Shore
HRA – Rockwell A
HRB – Rockwell B
HRC – Rockwell C
This is convenient because different industries, drawings and material specifications may use different hardness scales.
However, these values should not all be interpreted as direct measurements performed by their corresponding conventional test methods.
What Does the LS252D Actually Measure?
The LS252D is a Leeb hardness tester.
During measurement, an impact body strikes the surface of a suitable workpiece and rebounds.
The instrument evaluates the impact and rebound behavior to determine the Leeb hardness value.
In simplified form:
Impact → Rebound → HL
The instrument can then use an applicable relationship to express the result in another supported hardness scale.
For example:
Leeb Measurement → Conversion → HRC
This distinction is important.
What Is HL?
HL refers to Leeb hardness.
It is the native hardness scale associated with the Leeb rebound measurement method.
Leeb testing is especially useful for portable inspection of large, heavy and difficult-to-move metallic components.
Typical applications include:
Shafts
Forgings
Rollers
Molds
Dies
Large gears
Machinery components
Heavy fabricated parts
What Is HRC?
HRC means Rockwell C hardness.
It is widely used for hardened steels and is familiar in applications involving:
Tool steel
Heat-treated steel
Gears
Shafts
Dies
Molds
Machine components
When the LS252D displays HRC, the value is obtained through conversion from the Leeb measurement for an applicable material.
The instrument is not performing a direct Rockwell C indentation test.
What Is HB?
HB refers to Brinell hardness.
Brinell hardness is commonly encountered in engineering specifications for various metallic materials.
The LS252D supports HB conversion, allowing users to interpret suitable Leeb measurements in a familiar Brinell-related scale where applicable.
Again:
Converted HB ≠ Direct Brinell indentation test
The methods are different.
What Is HV?
HV refers to Vickers hardness.
Vickers testing is an indentation hardness method widely used for metals.
The LS252D can display converted HV values for supported materials and conditions.
This is useful for comparison, but it should not be confused with performing a direct Vickers indentation measurement.
Why Do Hardness Conversions Exist?
Different industries and engineering documents use different hardness scales.
Imagine a maintenance engineer performing a Leeb test on a large shaft while the equipment specification lists hardness in HRC.
Reporting only an HL value may be inconvenient for the engineer.
Conversion allows the measurement to be expressed in a scale that is more familiar to the user.
This makes portable hardness testing more practical for industrial work.
Are Hardness Conversions Universal?
No.
This is one of the most important points.
Hardness relationships depend on the material.
The relationship between HL and HRC for one material should not automatically be assumed to apply to every other metal.
This is why selecting the correct material group on the hardness tester is important.
Why Material Selection Matters
Suppose you measure a steel component but select an inappropriate material setting.
The instrument may still display a number.
That does not mean the converted hardness value is correct for the actual material.
Before testing:
Identify the material as accurately as possible.
Select the appropriate material group.
Select the required hardness scale.
Perform the measurement under suitable conditions.
Correct conversion begins with correct material selection.
Can I Convert Any HL Reading to HRC?
Not necessarily.
Conversion should only be used where an applicable conversion relationship exists for the material and hardness range.
Do not assume every possible HL result on every possible metal has a meaningful HRC equivalent.
The instrument's supported material and conversion ranges should be followed.
Why Two Different Hardness Testers May Not Show Exactly the Same HRC
Suppose you test a large steel component using the LS252D and obtain a converted HRC value.
You then test another appropriate area using a direct Rockwell hardness tester.
The results may not be exactly identical.
Possible reasons include:
Different testing principles
Different measurement locations
Material variation
Surface condition
Conversion relationship
Workpiece geometry
Testing uncertainty
This does not automatically mean one instrument is defective.
The two instruments are using different measurement methods.
Converted HRC vs Direct HRC
A useful way to remember the difference is:
Linshang LS252D
Impact and rebound → HL → Converted HRC
Rockwell C Tester
Specified indentation procedure → Direct HRC
If a customer only needs portable hardness assessment on a suitable large component, Leeb-to-HRC conversion may be useful.
If a contract or standard specifically requires direct Rockwell testing, use the required Rockwell method.
Converted HB vs Direct Brinell
The same principle applies to Brinell hardness.
A direct Brinell test uses its specified indentation procedure.
The LS252D instead performs a Leeb measurement and provides an applicable converted HB value.
Always distinguish between:
Hardness scale displayed
and
Hardness test method performed.
They are not necessarily the same thing.
Converted HV vs Direct Vickers
Likewise, an HV value displayed by a Leeb tester does not mean the instrument has performed a Vickers indentation.
For applications requiring direct Vickers testing according to a specified standard, use the appropriate Vickers hardness tester.
Which Scale Should I Use?
The correct scale depends on the application.
HL
Useful when working directly with Leeb hardness measurements.
HRC
Commonly used for hardened steels and heat-treated components.
HB
Frequently encountered for various engineering metals and components.
HV
Common in engineering, laboratory and material testing applications.
The required drawing, specification or QA/QC procedure should guide the selection.
Should I Record HL or Converted Values?
For internal QA/QC, it can be useful to understand and record the actual testing method used.
For example, instead of documenting only:
Hardness: 45 HRC
a quality procedure may need to distinguish that the value came from a portable Leeb measurement and conversion.
The appropriate reporting format should follow the company's quality system, customer requirements and applicable standards.
Example: Heat-Treated Shaft
A manufacturer needs to check a large heat-treated shaft.
The engineering drawing uses HRC.
Because the shaft is too large to conveniently place on a bench tester, the QA/QC engineer performs suitable Leeb measurements using the LS252D.
The instrument provides converted HRC values for comparison with the expected hardness range.
This can be useful for process checking.
However, if final customer acceptance specifically requires a direct Rockwell C test, the appropriate direct test may still be necessary.
Example: Large Casting
Another manufacturer needs to compare hardness across several areas of a large casting.
The company normally works with HB values.
Portable Leeb testing allows multiple suitable locations to be measured, with applicable converted HB values used for practical comparison.
The key is to understand that the measurement method remains Leeb.
Surface Condition Affects Conversion Too
A conversion cannot repair a poor original measurement.
If the Leeb reading is affected by:
Rust
Scale
Roughness
Workpiece movement
Insufficient thickness
Poor positioning
then the converted HRC, HB or HV value will also be affected.
Therefore:
Good conversion starts with a good Leeb measurement.
Five Rules for Using Hardness Conversion
Rule 1: Know Your Material
Do not guess the material setting.
Rule 2: Ensure the Workpiece Is Suitable
Check size, thickness, weight and rigidity.
Rule 3: Prepare the Surface
Avoid unsuitable rust, scale, paint and contamination.
Rule 4: Take Multiple Measurements
Do not depend on one isolated reading.
Rule 5: Know the Required Test Method
If the specification requires direct Rockwell, Brinell or Vickers testing, conversion may not satisfy the requirement.
Can LS252D Replace Three Different Bench Testers?
Not exactly.
The ability to display HRC, HB and HV does not mean the LS252D becomes a direct Rockwell, Brinell and Vickers tester simultaneously.
Its real advantage is different:
One compact portable Leeb tester can provide useful hardness measurements and supported conversions directly on suitable large metal components.
That is where its value lies.
Linshang LS252D Hardness Conversion Malaysia
The Linshang LS252D Leeb Hardness Tester supports multiple hardness scales, making it convenient for industrial users who work with different hardness specifications.
The most important principle to remember is:
Measurement method ≠ Displayed conversion scale.
The LS252D performs Leeb hardness testing. HRC, HB, HV and other supported values are applicable conversions.
Understanding this difference helps Malaysian engineers and QA/QC teams use portable hardness data correctly and select the appropriate test method for customer, production and maintenance requirements.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
馃寪 Website: www.mtmpre.com.my
馃摟 Email: mtmpre@yahoo.com
馃摫 WhatsApp: +6016-660 7346
Contact MTM Precision for Linshang LS252D Leeb Hardness Tester, hardness conversion guidance and portable hardness testing solutions in Malaysia.
12 Aug 2026
