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

CERTIFICATE NUMBER: AC-3026

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.

Rockwell

Hardness Scale	Hardness Range	Size mm with mirror surface	Weight
HRA	< 70	Ø 60X10 mm	0,35 kg
	≥ 70 and < 80	Ø 60X10 mm	0,35 kg
	≥ 80	Ø 60X10 mm	0,35 kg
HRB	< 60	Ø 60X10 mm	0,35 kg
	≥ 60 and < 88	Ø 60X10 mm	0,35 kg
	≥ 88	Ø 60X10 mm	0,35 kg
HRC	< 35	Ø 60X10 mm	0,35 kg
	≥ 35 and < 60	Ø 60X10 mm	0,35 kg
	≥ 60	Ø 60X10 mm	0,35 kg
HRD	< 51	Ø 60X10 mm	0,35 kg
	≥ 51 and < 71	Ø 60X10 mm	0,35 kg
	≥ 71	Ø 60X10 mm	0,35 kg
HRE	< 84	Ø 60X10 mm	0,35 kg
	≥ 84 and < 93	Ø 60X10 mm	0,35 kg
	≥ 93	Ø 60X10 mm	0,35 kg
HRF	< 80	Ø 60X10 mm	0,35 kg
	≥ 80 and < 94	Ø 60X10 mm	0,35 kg
	≥ 94	Ø 60X10 mm	0,35 kg
HR15N	< 78	Ø 60X10 mm	0,35 kg
	≥ 78 and < 90	Ø 60X10 mm	0,35 kg
	≥ 90	Ø 60X10 mm	0,35 kg
HR30N	< 55	Ø 60X10 mm	0,35 kg
	≥ 55 and < 77	Ø 60X10 mm	0,35 kg
	≥ 77	Ø 60X10 mm	0,35 kg
HR45N	< 37	Ø 60X10 mm	0,35 kg
	≥ 37 and < 66	Ø 60X10 mm	0,35 kg
	≥ 66	Ø 60X10 mm	0,35 kg
HR15T	< 81	Ø 60X10 mm	0,35 kg
	≥ 81 and < 87	Ø 60X10 mm	0,35 kg
	≥ 87	Ø 60X10 mm	0,35 kg
HR30T	< 57	Ø 60X10 mm	0,35 kg
	≥ 57 and < 70	Ø 60X10 mm	0,35 kg
	≥ 70	Ø 60X10 mm	0,35 kg
HR45T	< 33	Ø 60X10 mm	0,35 kg
	≥ 33 and < 53	Ø 60X10 mm	0,35 kg
	≥ 53	Ø 60X10 mm	0,35 kg

Brinell

Hardness Scale	Hardness Range	Size mm with mirror surface	Weight
HBW 10/3000	95.5 to 650	Ø 90X17 mm	1 kg
HBW 10/1500	47.7 to 327	Ø 90X17 mm	1 kg
HBW 10/1000	31.8 to 218	Ø 90X17 mm	1 kg
HBW 10/500	15.9 to 109	Ø 90X17 mm	1 kg
HBW 10/250	7.96 to 54.5	Ø 60X10 mm	0,35 kg
HBW 10/100	3.18 to 21.8	Ø 60X10 mm	0,35 kg
HBW 5/750	95.5 to 650	Ø 60X10 mm	1 kg
HBW 5/250	31.8 to 218	Ø 60X10 mm	0,35 kg
HBW 5/125	15.9 to 109	Ø 60X10 mm	0,35 kg
HBW 5/62,5	7.96 to 54.5	Ø 60X10 mm	0,35 kg
HBW 5/25	3.18 to 21.8	Ø 60X10 mm	0,35 kg
HBW 2.5/187.5	95.5 to 650	Ø 60X10 mm	0,35 kg
HBW 2.5/62.5	31.8 to 218	Ø 60X10 mm	0,35 kg

Vickers

Hardness Scale	Hardness Range	Size mm with mirror surface	Weight
HV2	From 200 to 750	Ø 60X10 mm	0,35 kg
HV3	From 200 to 750	Ø 60X10 mm	0,35 kg
HV5	From 175 to 750	Ø 60X10 mm	0,35 kg
HV10	From 175 to 750	Ø 60X10 mm	0,35 kg
HV20	From 175 to 750	Ø 60X10 mm	0,35 kg
HV30	From 175 to 750	Ø 60X10 mm	0,35 kg
HV50	From 175 to 750	Ø 60X10 mm	0,35 kg
HV100	From 175 to 750	Ø 60X10 mm	0,35 kg

Micro Vickers

Hardness Scale	Hardness Range	Size mm with mirror surface	Weight
HV0.01	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.015	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.02	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.025	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.05	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.1	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.2	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.3	From 200 to 750	Ø 25X10 mm	0,4 kg
HV0.5	From 200 to 750	Ø 25X10 mm	0,4 kg
HV1	From 200 to 750	Ø 25X10 mm	0,4 kg

Knoop

Hardness Scale	Hardness Range	Size mm with mirror surface	Weight
HK0.01	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.02	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.025	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.05	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.1	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.2	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.3	From 200 to 750	Ø 25X10 mm	0,4 kg
HK0.5	From 200 to 750	Ø 25X10 mm	0,4 kg
HK1	From 200 to 750	Ø 25X10 mm	0,4 kg
HK2	From 200 to 750	Ø 25X10 mm	0,4 kg

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