Rock 3

Consistent high quality at an affordable price


The Rock 3 is the Entry Level Rockwell tester in the Ernst by King line. This machine is ideal for various volume, accurate testing on all scales.

The Nose Piece serves as a reference point during testing to compensate for any deformation of the machine or the test piece that would otherwise effect the result. This reduces operator error and provides consistent and accurate results with minimal test piece preparation and operator training.

Test times as low as 4 seconds increases efficiency in the lab as the preload and load are applied through one pull of a lever.

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Rock 3
  • Meets ASTM E 18, ASTM D-785 & ISO 6056

  • Interchangeable heads for Rockwell and Superficial Rockwell testing

  • Digital output

  • Easy pre load & load application

4 Stand Options 
  •  N stand: standard 12x24x29 inch base.

  • T stand: allows for a larger vertical capacity with a 12x24x37 inch base. 

  • Car stand: essential for all mobile testing with a 37x13x43 inch base, with casters for east travel.

  • Mur stand: wall mounted stand perfect for vertical adjustments when testing, measuring 12x27.5x41 inches.

Rock 3 Technical Data

Operating Method/Principlew Rockwell and Superficial Rockwell
Certifications and Standards ASTM E-18, ASTM D-785, ISO 6506
Weight 128 lbs
Scales Rockwell: HRC, HRD, HRE, HRF, HRG, HRH, HRK, Brinell: HB30 and other scales on request Superficial Rickwell: HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, HR15W, HR30W, HR45W, HR15X and other scales on request
Pre-load Rockwell: 10 kgf; Superficial,: 3kgf
Load Rockwell: 60 kgf, 62.5 kgf, 100kgf, 125 kgf, 187.5 kgf, 150 kgf,; Superficial: 10kgf, 15 kgf, 15.6 kgf, 30 kgf, 31.2 kgf, 45 kgf
Load Application Manual
Tester capacity 8" vertical and 7' horizontal reach
Min Measurable Diameter 4mm
Load time Operator Choice
Read Out Digital
Output RS-232