ZHR Rockwell hardness tester

Unique accessibility

The various hardness testers in the Rockwell product group are used for classical Rockwell methods (load 60 - 150 kg), superficial Rockwell methods (load 15 - 45 kg) and Rockwell/superficial Rockwell combinations (load 15 - 150 kg).

Key advantages and features

Advantages and features

  • Nose-mounted indenter enables testing at difficult-to-access measurement points.
  • Separate indenter, for extended range of application.
  • Fully automatic test sequence (including automatic evaluation) eliminates operator influence on test results.
  • High test-result reproducibility.
  • Rugged construction with zero-backlash, ball-bearing-mounted lead-screw.
  • Test-area height up to 250 mm enables testing of larger workpieces.
  • Visual and audible signals when specified tolerances exceeded and during pre-load setting.
  • Comprehensive equipment included in delivery.
  • RS232C interface as standard.
  • Special specimen holders/grips to suit individual customer requirements.

Range of application

  • The hardness testers in the ZHR product group cover the following methods.
  • Classical Rockwell methods (ZHR4150)
    as per ISO 6508 and ASTM E18.
    pre-load: 10 kg. test load: 60, 100, 150 kg
    scales: A B C D E F G H K L M P R S V.
  • Superficial Rockwell (ZHR4045)
    as per ISO 6508 and ASTM E18
    pre-load: 3 kg. test load: 15, 30, 45 kg
    scales: N T W X Y.
  • Universal Rockwell (ZHR8150)
    as per ISO 6508 and ASTM E18.
    pre-load: 3, 10 kg. test load: 15, 30, 45, 60, 100, 150 kg.
    scales: A B C D E F G H K L M N P R S T V W X Y.
  • Rockwell for plastics (LKP)
    as per ISO 2039-2 and ASTM D785 (A & B).

Technical data for basic instruments

Loading control (load, dwell, unload)


Resolution, min.

0.1 units (e. g. 62.1 HRC)

Pre-load setting

with visual and audible aids

Test sequence start

manual or automatic

Test area, standard (H x D)

250 x 150


Dimensions (H x W x D)

800 x 260 x 670


Approx. weight



Power supply voltage

120 or 240


Power supply frequency

50 to 60


  • Included in delivery:
  • 1 diamond indenter
  • 1x 1/16'' ball indenter
  • 1 support table, Ø 70 mm
  • 1 user manual
  • 1 UKAS test certificate








Data processing

Mean value (display)

Mean value and variance (graphic)

Test series data file

Histogram (display + print)

Capability indices (display + print)

Standard deviation (display + print)

Good/bad evaluation (display and print)

Automatic display of selected hardness method

Automatic conversion (Vickers, Brinell, Rockwell, Knoop, tensile strength)

Automatic curvature correction (Ø = 3 to 20 mm)

Minimum thickness monitoring

Automatic load change

Programmable dwell time (1 to 50 sec.)

Single RS232C port

Twin RS232C ports

Internal clock

Holding-down clamp (factory-fitted option)

Motorized lead-screw (factory-fitted option)

The modular 'building block' system of these Rockwell hardness testers features different equipment versions and enables optimum instrument configuration for the application concerned.