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CALIBRATED HARDNESS TEST BLOCKS

ISO/IEC 17025 accredited certificates for Rockwell, Brinell, Vickers and Knoop scales

ATI supplies certified hardness test blocks for the verification and calibration of hardness testers according to major ISO and ASTM standards. Our range includes reference blocks for Rockwell, Brinell, Vickers, Micro Vickers and Knoop applications, with certified values across a wide selection of scales and hardness ranges.

Each block is certified through our ISO/IEC 17025 accredited laboratory, ANAB accreditation No. AC-3026.01, with ILAC-MRA recognition. This ensures traceability, international acceptance and reliable support for laboratories, manufacturers and quality control departments that require dependable hardness verification.

ANAB ISO/IEC 17025 Accreditation No. AC-3026.01

CERTIFIED HARDNESS TEST BLOCKS FOR INSTRUMENT VERIFICATION AND CALIBRATION

ATI provides certified hardness test blocks for the routine verification and calibration of hardness testers in accordance with major ISO and ASTM standards. Our range covers Rockwell, Brinell, Vickers, Micro Vickers and Knoop methods, with multiple hardness levels available for different verification needs.

Each certified block is produced and certified to support accurate machine checks, reliable calibration workflows and traceable quality control procedures. Thanks to our ISO/IEC 17025 accredited laboratory and international recognition through ILAC-MRA, ATI test blocks are suitable for demanding industrial and laboratory environments where metrological confidence is essential.

Available Types of Certified Hardness Test Blocks

Typical Applications

ATI certified hardness test blocks are used by accredited laboratories, manufacturers, heat treatment companies, aerospace suppliers, automotive producers, medical device companies and quality control departments that need traceable and repeatable hardness verification.

ILAC-MRA and ANAB accredited calibration lab logo, certifying ISO/IEC 17025 compliance.
Brinell, Rockwell, and Micro Vickers Master Test Blocks in white boxes for hardness testing from ATI.

WHY CHOOSE ATI TEST BLOCKS

  • ISO/IEC 17025 accredited certification
  • ILAC-MRA recognized traceability
  • Wide availability of scales and hardness ranges
  • Fast worldwide supply and technical support
Request a Quote for Calibrated Hardness Test Blocks

LIST OF AVAILABLE HARDNESS TEST BLOCKS

Below you can explore the available scales, hardness ranges, typical dimensions and weights of our certified hardness test blocks for each test method.

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Rockwell and Superficial Rockwell

Hardness Scale Hardness Range Size mm with mirror surface Weight
HRA 20 < HRA < 40 Ø 60X10 mm 0,2 kg
45 < HRA < 75 Ø 60X10 mm 0,2 kg
80 < HRA < 84 Ø 60X10 mm 0,2 kg
HRB 20 < HRB < 50 50X50 mm** 0,2 kg
60 < HRB < 70 60X40 mm 0,2 kg
88 < HRB < 100 60X40 mm 0,2 kg
HRC 20 < HRC < 30 Ø 60X10 mm 0,2 kg
35 < HRC < 55 Ø 60X10 mm 0,2 kg
60 < HRC < 70 Ø 60X10 mm 0,2 kg
HRD* 40 < HRD < 47 Ø 60X10 mm 0,2 kg
55 < HRD < 63 Ø 60X10 mm 0,2 kg
70 < HRD < 75 Ø 60X10 mm 0,2 kg
HRE 95 < HRE < 100 Ø 60X10 mm 0,2 kg
107 < HRE < 114 Ø 60X10 mm 0,2 kg
HRF 105 < HRF < 114 Ø 60X10 mm 0,2 kg
HR15N 70 < HR15N < 77 Ø 60X10 mm 0,2 kg
78 < HR15N < 88 Ø 60X10 mm 0,2 kg
89 < HR15N < 91 Ø 60X10 mm 0,2 kg
HR30N 42 < HR30N < 54 Ø 60X10 mm 0,2 kg
55 < HR30N < 73 Ø 60X10 mm 0,2 kg
74 < HR30N < 80 Ø 60X10 mm 0,2 kg
HR45N 20 < HR45N < 31 Ø 60X10 mm 0,2 kg
32 < HR45N < 61 Ø 60X10 mm 0,2 kg
62 < HR45N < 70 Ø 60X10 mm 0,2 kg
HR15T 77 < HR15T < 80 Ø 60X10 mm 0,2 kg
80 < HR15T < 83 Ø 60X10 mm 0,2 kg
88 < HR15T < 93 Ø 60X10 mm 0,2 kg
HR30T 49 < HR30T < 56 Ø 60X10 mm 0,2 kg
57 < HR30T < 63 Ø 60X10 mm 0,2 kg
73 < HR30T < 82 Ø 60X10 mm 0,2 kg
HR45T 23 < HR45T < 33 Ø 60X10 mm 0,2 kg
34 < HR45T < 43 Ø 60X10 mm 0,2 kg
58 < HR45T < 72 Ø 60X10 mm 0,2 kg

** The HRB (20 < HRB < 50) master test block has a square shape.
*These master hardness test blocks are subject to availability

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Brinell

Hardness Scale Hardness Range Size mm with mirror surface Weight
HBW 10/3000 150 < HBW < 225 Ø 90X17 mm 0,8 kg
225 < HBW < 350 Ø 90X17 mm 0,8 kg
350 < HBW < 650 Ø 90X17 mm 0,8 kg
HBW 10/1500* 150 < HBW < 225 Ø 90X17 mm 0,8 kg
225 < HBW < 350 Ø 90X17 mm 0,8 kg
350 < HBW < 650 Ø 90X17 mm 0,8 kg
HBW 10/1000 75 < HBW < 150 Ø 90X17 mm 0,8 kg
150 < HBW < 300 Ø 90X17 mm 0,8 kg
300 < HBW < 450 Ø 90X17 mm 0,8 kg
HBW 10/500 75 < HBW < 150 Ø 90X17 mm 0,8 kg
150 < HBW < 300 Ø 90X17 mm 0,8 kg
300 < HBW < 450 Ø 90X17 mm 0,8 kg
HBW 10/250* 75 < HBW < 150 Ø 60X10 mm 0,2 kg
150 < HBW < 300 Ø 60X10 mm 0,2 kg
300 < HBW < 450 Ø 60X10 mm 0,2 kg
HBW 10/100* 75 < HBW < 125 Ø 60X10 mm 0,2 kg
HBW 5/750 100 < HBW < 225 Ø 90X17 mm 0,8 kg
225 < HBW < 350 Ø 90X17 mm 0,8 kg
350 < HBW < 650 Ø 90X17 mm 0,8 kg
HBW 5/250* 75 < HBW < 150 Ø 60X10 mm 0,2 kg
150 < HBW < 300 Ø 60X10 mm 0,2 kg
300 < HBW < 450 Ø 60X10 mm 0,2 kg
HBW 5/125* 75 < HBW < 150 Ø 60X10 mm 0,2 kg
150 < HBW < 300 Ø 60X10 mm 0,2 kg
300 < HBW < 450 Ø 60X10 mm 0,2 kg
HBW 5/62,5* 75 < HBW < 150 Ø 60X10 mm 0,2 kg
150 < HBW < 300 Ø 60X10 mm 0,2 kg
300 < HBW < 450 Ø 60X10 mm 0,2 kg
HBW 2.5/187.5 100 < HBW < 225 Ø 90X17 mm 0,8 kg
225 < HBW < 350 Ø 90X17 mm 0,8 kg
350 < HBW < 650 Ø 90X17 mm 0,8 kg
HBW 2.5/62.5 75 < HBW < 150 Ø 60X10 mm 0,2 kg
150 < HBW < 300 Ø 60X10 mm 0,2 kg
300 < HBW < 450 Ø 60X10 mm 0,2 kg

*These master hardness test blocks are subject to availability

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Vickers

Hardness Scale Hardness Range Size mm with mirror surface Weight
HV2* 200 < HV2 < 350 Ø 60X10 mm 0,2 kg
350 < HV2 < 450 Ø 60X10 mm 0,2 kg
450 < HV2 < 750 Ø 60X10 mm 0,2 kg
HV3* 200 < HV3 < 350 Ø 60X10 mm 0,2 kg
350 < HV3 < 450 Ø 60X10 mm 0,2 kg
450 < HV3 < 750 Ø 60X10 mm 0,2 kg
HV5 175 < HV5 < 350 Ø 60X10 mm 0,2 kg
350 < HV5 < 450 Ø 60X10 mm 0,2 kg
450 < HV5 < 750 Ø 60X10 mm 0,2 kg
HV10 175 < HV10 < 350 Ø 60X10 mm 0,2 kg
350 < HV10 < 450 Ø 60X10 mm 0,2 kg
450 < HV10 < 750 Ø 60X10 mm 0,2 kg
HV20* 175 < HV20 < 350 Ø 60X10 mm 0,2 kg
350 < HV20 < 450 Ø 60X10 mm 0,2 kg
450 < HV20 < 750 Ø 60X10 mm 0,2 kg
HV30 175 < HV30 < 350 Ø 60X10 mm 0,2 kg
350 < HV30 < 450 Ø 60X10 mm 0,2 kg
450 < HV30 < 750 Ø 60X10 mm 0,2 kg
HV50* 175 < HV50 < 350 Ø 60X10 mm 0,2 kg
350 < HV50 < 450 Ø 60X10 mm 0,2 kg
450 < HV50 < 750 Ø 60X10 mm 0,2 kg
HV100* 175 < HV100 < 350 Ø 60X10 mm 0,2 kg
350 < HV100 < 450 Ø 60X10 mm 0,2 kg
450 < HV100 < 750 Ø 60X10 mm 0,2 kg

*These master hardness test blocks are subject to availability

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Micro Vickers

Hardness Scale Hardness Range Size mm with mirror surface Weight
HV0.01* 200 < HV0.01 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.01 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.01 < 750 Ø 25X10 mm 0,1 kg
HV0.015* 200 < HV0.015 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.015 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.015 < 750 Ø 25X10 mm 0,1 kg
HV0.02* 175 < HV0.02 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.02 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.02 < 750 Ø 25X10 mm 0,1 kg
HV0.025* 175 < HV0.025 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.025 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.025 < 750 Ø 25X10 mm 0,1 kg
HV0.05* 175 < HV0.05 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.05 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.05 < 750 Ø 25X10 mm 0,1 kg
HV0.1 175 < HV0.1 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.1 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.1 < 750 Ø 25X10 mm 0,1 kg
HV0.2 175 < HV0.2 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.2 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.2 < 750 Ø 25X10 mm 0,1 kg
HV0.3 175 < HV0.3 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.3 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.3 < 750 Ø 25X10 mm 0,1 kg
HV0.5 175 < HV0.5 < 350 Ø 25X10 mm 0,1 kg
350 < HV0.5 < 450 Ø 25X10 mm 0,1 kg
450 < HV0.5 < 750 Ø 25X10 mm 0,1 kg
HV1 175 < HV1 < 350 Ø 25X10 mm 0,1 kg
350 < HV1 < 450 Ø 25X10 mm 0,1 kg
450 < HV1 < 750 Ø 25X10 mm 0,1 kg

*These master hardness test blocks are subject to availability

F.A.Q.

What Is a Hardness Test Block?

A hardness test block is a certified reference specimen used to verify the performance and accuracy of a hardness testing machine. Each block has a defined hardness value established through a controlled calibration process and documented in a certificate traceable to recognized international standards.

Certified hardness test blocks are used for routine checks, calibration procedures, machine verification after maintenance or relocation, and whenever traceable hardness results are required by internal quality systems or customer specifications.

When Is a Hardness Test Block Used?

Hardness test blocks are used:

  • Before daily use of a hardness tester (as part of routine verification)
  • During periodic calibrations by accredited laboratories
  • After repairs or mechanical adjustments
  • To ensure test consistency across different operators or machines

They are essential for confirming that your Rockwell, Brinell, Vickers, or Knoop hardness tester is providing accurate and repeatable results.

When Is It Necessary to Use a Certified Block?

A certified test block is typically required when:

  • You must comply with ISO/IEC 17025, ISO, or ASTM quality standards
  • You are performing internal audits or external inspections
  • Your process requires traceable results (e.g. aerospace, automotive, or medical industries)
  • Your hardness tester has not been verified recently or has been moved or adjusted

How to Maintain a Hardness Test Block

To ensure the accuracy and longevity of your test blocks:

  • Avoid repeated testing on the same area; use the entire surface systematically
  • Store in a protective case, away from dust and humidity
  • Clean regularly with alcohol or a lint-free cloth
  • Avoid contamination or oil residue from samples
  • Replace when surface wear or deformation is visible
  • Recalibrate annually, or as required by your internal quality procedures
Certificate of Calibration for Master Hardness Test Block Rockwell, issued by ATI, showing calibration details.