Method, load range, specimen geometry and automation must match the actual hardness-testing task.
Products · Hardness testers · Selection guide
Select hardness testers for metals, ceramics and polymers
Vickers, Rockwell, Brinell, Knoop or a portable system: the right instrument depends on material, test objective, standard, specimen geometry and required automation.
A hardness tester measures a material's resistance to a defined indenter. Diamond or carbide is applied with a specified force and dwell time. The instrument then evaluates the residual indentation optically or measures the penetration depth.
A sound selection considers more than the desired hardness scale. Specimen thickness, surface condition, microstructure, accessibility, point spacing, throughput and documentation all affect the required configuration.
Which hardness tester fits which task?
This comparison is an initial filter. The final selection must be checked against the applicable standard, real component and required measuring range.
Tester
Principle
Typical strength
Materials and tasks
Common standards
Vickers
Optical measurement of diamond-indentation diagonals
Micro and low-load testing, traverses, thin zones
Metals, ceramics, coatings and small specimens
ISO 6507, ASTM E92, ASTM E384
Rockwell
Depth difference between minor and major load
Fast routine and production testing
Mainly metals; further materials depend on scale
ISO 6508, ASTM E18
Brinell
Optical measurement of a ball indentation
Coarse or heterogeneous materials
Cast materials, steels and non-ferrous alloys of sufficient thickness
ISO 6506, ASTM E10
Knoop
Optical measurement of an elongated diamond indentation
Brittle materials, thin layers and small areas
Ceramics, coatings and microhardness tasks
ISO 4545, ASTM E384
Shore / IRHD
Spring-loaded, depth-related indentation
Fast assessment of elastic materials
Rubber, elastomers and polymers
ISO 48, ISO 868, ASTM D1415, ASTM D2240
Portable
Method-dependent measurement on the component
On-site testing of large or installed parts
Assets, large components and difficult locations
Depends on the selected method
Hardness testers by method and application profile
Micro to macro hardness
Vickers testers
For small indents, hardness traverses, layers and differentiated point patterns.
Coarse microstructures
Brinell testers
For larger representative impressions in castings, steels and heterogeneous structures.
Routine and production
Rockwell testers
A depth-based method for robust, fast and readily automated workflows.
Multiple methods and points
Universal and automated
For changing load ranges, motorised axes, point sequences and structured data output.
Seven criteria for selecting a hardness tester
Material and hardness range: metals, ceramics, coatings, polymers and elastomers require different methods.
Test objective: a single value, traverse, layer assessment, incoming inspection or release.
Specimen geometry: height, support, curvature, accessibility and thickness define the usable space.
Surface preparation: optical methods usually need a better finish than robust depth methods.
Standard and uncertainty: load, indenter, verification and reporting must match the rules.
Test volume: motorised stages, autofocus and image analysis reduce recurring effort.
Data flow: recipes, users, exports and LIMS or quality-system integration should be defined early.
Manual, stationary or fully automated?
A manual tester can be sufficient for a few clearly defined measurements. Traverses, mounted specimen batches and recurring plans benefit from a motorised XY stage, reproducible positioning and automated optical evaluation. Production additionally requires component handling, cycle time, interfaces and traceable result assignment.
A universal tester provides flexibility when multiple methods are genuinely used. For a stable task, a dedicated Vickers, Rockwell or Brinell tester may be simpler and more economical.
Standards, verification and reference blocks
Standard-compliant testing covers more than the method name. Force application, indenter, measuring system, dwell time, specimen requirements and reporting are defined. Clarify the applicable ISO or ASTM edition and the required direct and indirect verification before procurement.
Calibrated reference blocks support routine checks but do not replace professional machine verification or examination of load application and indenter condition.
Hardness tester or instrumented indentation?
A classical hardness tester returns a standardised hardness value. If local stress-strain curves, proof stress or tensile-strength comparison values are required from small zones, indentation plastometry may be the better addition. For load-depth curves, modulus and micro- or nanoscale behaviour, see instrumented indentation testing.
Frequently asked questions about hardness testers
What is a hardness tester?
A hardness tester presses a defined indenter into a specimen under controlled load. Depending on the method, it evaluates either the residual indentation or the penetration depth.
Which hardness tester is suitable for metals?
Vickers, Rockwell and Brinell testers are widely used for metals. Material condition, thickness, microstructure, expected hardness, applicable standard and throughput determine the best method.
When is a universal hardness tester useful?
A universal tester is useful when several standardised methods or substantially different load ranges are used regularly on one platform.
When should hardness testing be automated?
Automation is valuable for many points, hardness traverses, recurring specimens and traceable documentation, while also reducing operator influence.
Which standards matter for hardness testers?
Common standards include ISO 6506 and ASTM E10 for Brinell, ISO 6507 and ASTM E92 or E384 for Vickers, ISO 6508 and ASTM E18 for Rockwell, and ISO 4545 and ASTM E384 for Knoop.
Can a portable hardness tester replace a laboratory instrument?
Portable instruments help with large or installed components. Whether they replace a stationary system depends on method, geometry, surface, required uncertainty and the applicable standard.
