ISO 6508-2 – Rockwell Hardness: Verification and Calibration of Testing Machines and Indenters

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ISO 6508-2 is the ISO standard that specifies two separate methods for verifying testing machines used to determine Rockwell hardness in accordance with ISO 6508-1, direct and indirect, together with a method for verifying Rockwell indenters. The current edition is ISO 6508-2:2023.

Direct verification checks whether the main machine parameters, such as applied force, depth measurement and testing cycle timing, fall within specified tolerances. Indirect verification uses a number of calibrated reference hardness blocks to show how well the machine measures a material of known hardness. The standard applies to stationary and portable machines, and it treats tungsten carbide composite as the standard material for ball indenters. Labs usually plan verification intervals and indenter checks around this part and the edition cited by their customers.

Rockwell testers such as the NG-RockGen DGEN Series digital Rockwell hardness tester are used for Rockwell testing where machine and indenter verification to ISO 6508-2 is part of the lab routine. If you need help matching ISO 6508-2 requirements to your parts or setup, contact our team.

Products With This Standard: ISO 6508-2

Below you can find the products in our catalog that support this standard and the related testing workflow.

NG-RockGen Analogue Series – Rockwell Hardness Tester

NG-RockGen Analogue Series – Rockwell Hardness Tester

NG-RockGen Analogue Series is a Rockwell hardness tester for routine hardness measurement of metals, available in manual and electronic models. It supports HRA, HRB, and HRC scales with a 10 kg preload and 60, 100, or 150 kg total test forces. Suitable for hardened steel, castings, aluminum alloys, bearing steel, and hard alloys, it provides practical shop-floor and laboratory verification.

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NG-RockGen DGEN Series – Digital Rockwell Hardness Tester

NG-RockGen DGEN Series – Digital Rockwell Hardness Tester

NG-RockGen DGEN Series is a digital Rockwell hardness tester for measuring metal hardness by indentation depth under standard Rockwell loading. Available in regular, superficial, and TWIN configurations, it supports common HRA, HRB, HRC, N, and T scales, automatic test cycles, LCD readout, 0.001 resolution, built-in printer, RS-232 output, and repeatable testing for steel, castings, alloys, and bearing materials.

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GenRock NG-150 Series – Rockwell Hardness Tester

GenRock NG-150 Series – Rockwell Hardness Tester

GenRock NG-150 Series is an advanced Rockwell hardness tester for regular and superficial hardness testing of metals and alloys. Available in manual and automatic configurations, it supports ASTM E18, EN ISO 6508, and GB/T 230 workflows. Touchscreen operation, fast indentation cycles, arc correction, data storage, RS-232 output, and 0.001 resolution help laboratories improve accuracy, repeatability, and reporting efficiency.

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UniGen – Universal Hardness Tester (Rockwell, Vickers, Brinell)

UniGen – Universal Hardness Tester (Rockwell, Vickers, Brinell)

UniGen is an all-in-one universal hardness testing system for Rockwell, Vickers, Knoop, and Brinell measurements. Built for accurate, repeatable hardness testing, it combines a large touchscreen interface, closed-loop load-cell force control, automated test-force correction, and compensated loading without traditional weights. ASTM, ISO, JIS, and GB/T compatibility makes it suitable for laboratories needing multiple hardness methods in one robust platform.

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Hardness Test Blocks, Indenters and Accessories

Hardness Test Blocks, Indenters and Accessories

Hardness test blocks, indenters, and accessories support daily verification and reliable operation of metal hardness testing systems. The range includes certified Rockwell, Brinell, Vickers, and Knoop blocks, along with diamond, carbide, ball, and specialized indenters, anvils, and accessories. ASTM- and ISO-aligned calibration options help laboratories confirm tester accuracy whenever scales, loads, indenters, or operating conditions change.

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