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Tall Frame TWIN Rockwell Hardness Tester

Model No. 900-386


The NEW! Phase II Tall Frame 900-386 twin hardness tester can be used directly to measure Rockwell and superficial Rockwell hardness and change those values of Rockwell hardness into HB, HV, HLD, HK and σb values. Loaded with features such as ultra precise measurements, wide measuring range, automatic main test force loading/unloading, digitally displayed results, etc. The 900-386 is suitable for hardness testing on carbon steel, alloy steel, cast iron, non ferrous metal and engineering plastics. A perfect performer suited for any environment including heat treat facilities, tool rooms, workshops, laboratories and inspection labs

  • The protruding indenter design is ideal for testing inside diameters and recesses, often impossible with more traditional hardness testers. Inside diameters as small as 1-1/2-inches can be tested with the standard indenter. Operators can test close to vertical surfaces, to within 1/4-inch with the standard indenter. Testing is fast, accurate and there are fewer broken diamonds due to an outstanding viewing area
  • Wide measurement range: 30 rockwell hardness scales in total, HRA, HRB, HRC, HRD, HRE, HRF, HRG, HRH, HRK, HRL, HRM, HRP, HRR, HRS, HRV, HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, HR15W, HR30W, HR45W, HR15X, HR30X, HR45X, HR15Y, HR30Y and HR45Y
  • Auxiliary functions: The 900-386 rockwell hardness tester is capable of upper and lower limit settings; data statistics, the computing for average value, standard deviation, maximum and minimum; scale conversion (the testing results can be converted into the values of HB, HV, HLD, HK and σb (strength); curved surface correction will automatically correct the measuring results for cylindrical surface and spherical surface
rockwell - superficial rockwell hardness tester digital twin


Minor Load 3 Kgf, 10 Kgf
Major Load 15Kgf 60 Kgf
30 Kgf 100 Kgf
45 Kgf 150 Kgf
Test Force Application Dead Weight
Test Force Control Motorized
Display Hi-Def. Digital Readout
Display Resolution 0.1HR
Vertical Capacity 16.9 in.
Throat Depth 7.8 in.
Power Supply single phase, AC, 110V/220V(selectable)
Weight 285lbs Net (Shipping weight = 350 lbs)
Dimensions 730mm×400mm×1000mm

Hardness Tester Accessories Portable Hardness Testers
Hardness Tester Block Certification Minimum Thickness Chart for Rockwell Hardness Testing
Rebuilt Inventory with Full Warranty Rockwell Hardness Scale Indentor Load Chart
Hardness Tester Conversion Chart Hardness Setup:
  • 900-331
  • Principle of Rockwell Hardness Testing NIST Links
    Roundness Correction Chart for Hardness Testing ASTM Links