Hardness reference blocks

Vickers, Rockwell, Knoop and Brinell

Hardness reference blocks, also referred to as test plates, are used for indirect calibration methods and periodic daily inspection of hardness testing instruments.

The use of high quality, consistent hardness reference blocks with minimal hardness deviation is essential to ensure the operational reliability of hardness testing machines. To ensure traceability to the hardness standard, the reference blocks must have a minimal hardness deviation and be calibrated with minimal measurement uncertainty.

Hardness reference blocks from ZwickRoell are calibrated according to UKAS standards in the Indentec UKAS-accredited lab to ensure that every block is reliable and meets the required standard. Our hardness reference blocks cover the full spectrum of hardness test methods, scales and values and are used in a number of different industries around the world, including aerospace, automotive, science, engineering, manufacturing, medicine and primary metal production.

Trust through accreditation Vickers Rockwell & Superficial Knoop and micro-Knoop Brinell Additional options

ZwickRoell hardness reference blocks to Vickers, Rockwell and Superficial Rockwell, Knoop and micro-Knoop as well as Brinell according to

Trust through calibration

The calibration lab at Indentec is accredited by UKAS, the national accreditation organization for Great Britain. As part of the European and international accreditation organizations and a signatory to the ISO/IEC 17011 agreements, UKAS provides global recognition to ensure that the highest standards are met, giving customers full confidence in ZwickRoell Indentec products.

Every hardness reference block from ZwickRoell Indentec is delivered with a UKAS certificate.

Vickers hardness reference blocks

We deliver hardness reference blocks for macro-Vickers, low load Vickers and micro-Vickers hardness scale, which cover the entire range of hardness values.
All hardness reference blocks are delivered with a UKAS calibration certificate.

The following hardness values by Vickers hardness scale are available:

Table with all Vickers hardness reference block options

Rockwell & Superficial Rockwell hardness reference blocks

We supply hardness reference blocks that cover both Rockwell and Superficial Rockwell hardness, with blocks for all scales that cover the range of hardness values.
All reference blocks are delivered with a UKAS calibration certificate.

The following hardness values by scale are available:

Table with all Rockwell & Superficial Rockwell hardness reference block options

Hardness reference blocks for Knoop and micro-Knoop

We supply hardness reference blocks for a wide range of Knoop scales and hardness values.
All reference blocks are delivered with a UKAS calibration certificate.

Hardness reference blocks to Knoop for the following values by scale are available:

Table with all Knoop & micro-Knoop hardness reference block options

Brinell hardness reference blocks

We supply hardness reference blocks for a series of Brinell hardness scales, which cover a wide range of hardness values. All reference blocks are delivered with a UKAS calibration certificate. See below for the values by scale options.

Table with all Brinell hardness reference block options

Additional options for hardness reference blocks

Adding grid lines to the reference block:
- Rockwell standards; 3 mm or 4 mm
- Macro-Vickers reference blocks; 4 mm
- Brinell; 4 mm, 11 mm or 18 mm
Recalibration of existing hardness reference blocks
Additional calibration of a new hardness reference block

Do you have any questions regarding our products?

Please feel free to contact our product experts.
We look forward to discussing your needs.

Vickers hardness reference blocks

Nominal Vickers hardness reference block values
Indents produced <20µm are not covered by ISO/ASTM standard

_{Standard loads (Kg) available:
HV2 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV3 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV5 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV10 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV20 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV30 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV50 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV100 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900}

Nominal low force Vickers & micro Vickers reference block values
_{Low force loads (Kg) available:HV0.2 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV0.3 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV0.5 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV1 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900}

_{Micro force loads (Kg) available:}
_{HV0.010 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV0.025 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV0.050 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HV0.1 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900}

Rockwell & superficial hardness reference blocks

Rockwell and Superficial Rockwell

_{SCALE NOMINAL REFERENCE BLOCK VALUES
HRL 123 118 92
HRM 118 107 67
HRP 112 94 86
HRR 126 123 105
HRS 123 117 115
HRV 120 109 107
HR15W 94 87 84
HR30W 87 73 67
HR45W 80 59 50
HR15X 96 93 92
HR30X 92 84 82
HR45X 85 76 72
HR15Y 98 96 95
HR30Y 95 91 90
HR45Y 94 87 85}

_{SCALE NOMINAL REFERENCE BLOCK VALUES
HRC 20 25 30 35 40 45 50 55 60 65
HRA (±1.5) 60 62,5 65 67,5 70 72,5 75 77,5 81 84
HRD (±2) 40 44 48 52 55 59 63 67 71 75
HR15N (±1.5) 69 72 75 78 80 83 86 88 90 92
HR30N (±2.5) 41 46 50 55 60 64 69 73 78 82
HR45N (±3) 20 26 31 37 43 49 55 61 67 72}

_{SCALE NOMINAL REFERENCE BLOCK VALUES
HRB 20 30 40 50 60 70 80 90 100
HRA (±2.5) 23 27 31 35 40 44 50 55 61
HRE (±3) 69 75 81 87 93 100
HRF (±3) 68 74 80 86 91 97
HRG (±8) 3 18 33 49 66 83
HRH 95 98
HRK (±4.5) 38 47 56 65 73 82 91 99
HR15T (±2) 68 71 74 77 80 83 87 90 93
HR30T (±3.5) 29 36 43 50 56 63 70 76 83
HR45T (±5) 3 13 23 33 43 53 63 73}

Knoop hardness reference blocks

Nominal low force Knoop & micro Knoop reference block values
Indents produced <20µm are not covered by ISO/ASTM standard

_{Micro force loads (Kg) available:}
_{HK0.001 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.005 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.010 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.025 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.050 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.1 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900}

_{Low force loads (Kg) available:}
_{HK0.2 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.3 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK0.5 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900
HK1 40 70 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 900}

Brinell hardness reference blocks

Brinell heavy load

_{SCALE NOMINAL REFERENCE BLOCK VALUES}
_{HBW 10/3000 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 10/1500 40 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 10/1000 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 10/500 40 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 10/250 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 5/750 70 100 150 170 200 250 300 350 400 450 500 550 600 650
HBW 5/250 40 70 100 150 170 200 250 300 350 400 450 500 550 600 650
Values in italics are not covered by standard}

Brinell low load

_{SCALE NOMINAL REFERENCE BLOCK VALUES
HBW 10/100 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 5/125 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 5/62.5 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 5/25 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 2.5/187.5 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 2.5/62.5 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 2.5/31.25 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 2.5/15.625 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 2.5/6.25 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 1/30 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 1/10 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 1/5 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 1/2.5 40 70 100 150 170 200 250 300 350 400 450 500 550 600
HBW 1/1 40 70 100 150 170 200 250 300 350 400 450 500 550 600
Values in italics are not covered by standard}

Adding grid lines to the reference block:

Recalibration of existing hardness reference blocks

Additional calibration of a new hardness reference block

Vickers hardness reference blocks

Rockwell & superficial hardness reference blocks

Knoop hardness reference blocks

Brinell hardness reference blocks