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MASTER HARDNESS TEST BLOCKS

We provide high-precision master hardness test blocks for every hardness scale, including ILAC MRA certification by ANAB ISO/IEC 17025, to ensure daily and continuous accuracy on your hardness testers. They are available in all Rockwell, Brinell, Vickers, and Knoop scales. Choose AFFRI Inc. for precise, certified specimens that meet the highest standards.

CERTIFICATE NUMBER: AC-3026

MASTER HARDNESS TEST BLOCKS

We provide high-precision master hardness test blocks for every hardness scale, including ILAC MRA certification by ANAB ISO/IEC 17025, to ensure daily and continuous accuracy on your hardness testers. They are available in all Rockwell, Brinell, Vickers, and Knoop scales. Choose AFFRI Inc. for precise, certified specimens that meet the highest standards.

CERTIFICATE NUMBER: AC-3026

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Certified Precision Master Test Blocks for Hardness Instrument Calibration

ATI Laboratory Accredited ISO/IEC 17025

Affri Testing Instruments Laboratory is ANAB ISO/IEC 17025 accredited with certificate no. AC 3026, and offers high-precision certified test blocks for the calibration and verification of hardness testers, ensuring full compliance with international ISO and ASTM standards. Our certified test blocks cover all hardness scales, including Rockwell, Brinell, Vickers, and Knoop, and are available in a wide range of values to meet the diverse calibration needs of our customers.

Brinell Master Test Block
Rockwell Master Test Block
Vickers Master Test Block
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CERTIFIED PRECISION MASTER TEST BLOCKS
FOR HARDNESS INSTRUMENT CALIBRATION

Affri Testing Instruments Laboratory is ANAB ISO/IEC 17025 accredited with certificate no. AC 3026, and offers high-precision certified test blocks for the calibration and verification of hardness testers, ensuring full compliance with international ISO and ASTM standards. Our certified test blocks cover all hardness scales, including Rockwell, Brinell, Vickers, and Knoop, and are available in a wide range of values to meet the diverse calibration needs of our customers.

Brinell Master Test Block
Rockwell Master Test Block
Vickers Master Test Block
ATI Laboratory Accredited ISO/IEC 17025

Rockwell

  • Rockwell
Hardness ScaleHardness RangeSize mm with mirror surfaceWeight
HRA20 < HRA < 40Ø 60X10 mm0,2 kg
45 < HRA < 75Ø 60X10 mm0,2 kg
80 < HRA < 84Ø 60X10 mm0,2 kg
HRB20 < HRB < 5050X50 mm**0,2 kg
60 < HRB < 7060X40 mm0,2 kg
88 < HRB < 10060X40 mm0,2 kg
HRC20 < HRC < 30Ø 60X10 mm0,2 kg
35 < HRC < 55Ø 60X10 mm0,2 kg
60 < HRC < 70Ø 60X10 mm0,2 kg
HRD*40 < HRD < 47Ø 60X10 mm0,2 kg
55 < HRD < 63Ø 60X10 mm0,2 kg
70 < HRD < 75Ø 60X10 mm0,2 kg
HRE95 < HRE < 100Ø 60X10 mm0,2 kg
107 < HRE < 114Ø 60X10 mm0,2 kg
HRF105 < HRF < 114Ø 60X10 mm0,2 kg
HR15N70 < HR15N < 77Ø 60X10 mm0,2 kg
78 < HR15N < 88Ø 60X10 mm0,2 kg
89 < HR15N < 91Ø 60X10 mm0,2 kg
HR30N42 < HR30N < 54Ø 60X10 mm0,2 kg
55 < HR30N < 73Ø 60X10 mm0,2 kg
74 < HR30N < 80Ø 60X10 mm0,2 kg
HR45N20 < HR45N < 31Ø 60X10 mm0,2 kg
32 < HR45N < 61Ø 60X10 mm0,2 kg
62 < HR45N < 70Ø 60X10 mm0,2 kg
HR15T77 < HR15T < 80Ø 60X10 mm0,2 kg
80 < HR15T< 83Ø 60X10 mm0,2 kg
88 < HR15T < 93Ø 60X10 mm0,2 kg
HR30T49 < HR30T < 56Ø 60X10 mm0,2 kg
57 < HR30T < 63Ø 60X10 mm0,2 kg
73 < HR30T < 82Ø 60X10 mm0,2 kg
HR45T23 < HR45T < 33Ø 60X10 mm0,2 kg
34 < HR45T < 43Ø 60X10 mm0,2 kg
58 < HR45T < 72Ø 60X10 mm0,2 kg

**HRB (20<HRB<50) has squared shape

*These master hardness test blocks are subject to availability

Brinell

  • 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
225 < HBW < 350 Ø 90X17 mm 0,8
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

Vickers

  • 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
HV30* 200 < HV3 < 350 Ø 60X10 mm 0,2 kg
6350 < 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

Micro Vickers

  • 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
6350 < 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

When Should a Hardness Test Block Be Used?
These blocks are essential in several scenarios, including:

  • Routine checks before using a hardness tester each day

  • Scheduled calibrations carried out by accredited labs

  • After servicing, adjustments, or relocation of the testing machine

  • To ensure consistent results between different operators or instruments

When Is a Certified Block Required?
Using a certified hardness block is mandatory in the following cases:

  • When compliance with ISO/IEC 17025, ISO, or ASTM standards is needed

  • During internal audits or third-party inspections

  • In industries that require traceable test data (such as aerospace, medical, or automotive)

  • If the hardness tester hasn’t been verified recently or has undergone changes

Best Practices for Maintaining Test Blocks
To extend the life and reliability of your test blocks:

  • Distribute tests across the surface to avoid repeated impressions in one area

  • Store blocks in protective cases, away from dust and moisture

  • Clean with alcohol or a lint-free cloth to prevent contamination

  • Avoid contact with oil, dirt, or residue from test samples

  • Replace blocks when worn or visibly deformed

  • Schedule recalibration annually or according to your internal quality system