Digital Rockwell Hardness Tester Tallboy

Model No. 900-366


  • 16″/400mm workpiece height testing capacity
  • Upper/Lower Limit Settings
  • Memory of 500 test results
  • Curved Surface Auto Correction

Hardness Tester Features:

This digital Rockwell hardness tester with fully automated load/unload procedures affords highly sensitive and accurate readings. Micro computer controlled with USB output to built-in mini printer or PC. Utilizing the guidelines of ASTM E-18, the 900-366 digital Rockwell hardness tester offers programmable scale conversions, dwell times, statistical capabilities and test counter. Capable of testing in all of the regular Rockwell® scales.

For full conformance to the latest E18-20 specification, please call (201)962-7373

Automatic conversions to: HRN, HRT, HB, HV, HLD and σb.


Minor Load 10 Kgf
Major Load 60 Kgf, 100 Kgf, 150 KGF
Test Force Application Dead Weight
Test Force Control Motorized
Results Display Hi Def LCD Digital Readout
Resolution 0.1HR
Vertical Capacity 16.5″
Memory/Output 500 Tests/USB
Throat Depth 6.50″
Height 28.34″
Width 7.87″
Depth 21.60″

Standard Accessories:

  • C-scale Diamond Indenter
  • 1/16″ Ball Indenter
  • Built-in Mini Printer
  • Test Table 5.87″ (150mm)
  • Flat Anvil 2.5″ (63mm)
  • Std. Vee Anvil
  • Accessory Case
  • Dust Cover
  • 3 piece-HRC test blocks
  • 1 piece-HRB test block


The 900-366 digital Rockwell hardness tester comes complete with everything needed to test in the following
Rockwell Scales: A, B, C, D, F, G. Other Rockwell Scales can be achieved with optional indentors!

Key performance parameters

  • Preload: 98.1N(10kgf)
  • Total test force: 588.4N(60kgf),980.7N(100kgf),1471N(150kgf),
  • Conversions:The 900-366 digital Rockwell hardness tester can convert the measured Rockwell hardness value to other scales or even tensile strength. Example: the value of HRA scale can be automatically converted into HBS, HBW, HV and HK value; Convert the value of HRB scale into HB10, HB30, HV, HLD, σb and HK value; Convert the value of HRC scale into HBS, HBW, HV, HLD, HR15N, HR30N, σb and HK value; Convert the value of HRD scale into HV, HK, HB value; Convert the value of HRE scale into HV, HK, HB value; Convert the value of HRF scale into HV, HB value.
  • Load cycle 3~8s
  • Load dwell duration: 2~50s
  • Resolution :0.1HR
  • Display High definition backlight LCD
  • Operation: Menu selectable, Membrane keypad
  • Auxiliary functions Upper/lower limits setting& alarming, Data statistics, Avg., Max., Min., S, R, Scale conversion, HV, HB, σb, etc. Curved surface Auto Correction
  • Data output: Print out, or output to PC through USB port
  • Memory: Max 500 items of test results stored automatically
  • Testing Capacity:Vertical:strong>7.87” Throat Depth:6.50”
  • Dimensions:Height: 21.65” Width:10” Depth: 36.6”
  • Power supply:single phase, AC, 110V, 50~60Hz, 4A
  • Prior to ship, please advise power setting needed.

  • Net weight:220 lbs (100kg)
  • Shipping Weight:approx. 300 lbs

Test parameter setting

Load dwell setting

Limit setting

Data statistics

Scale conversion

Browse through/print from memory

Testing: Preload

Automatic testing

Rockwell Hardness Tester Scale/Indentor/Load chart

Scale Symbol Indenter Type
Ball dimensions indicate diameter
Preliminary Force N (kgf)> Total Force N (kgf) Typical Application
A Spheroconical Diamond 98.07 (10) 588.4 (60) Cemented carbides, thin steel and shallow case hardened steel
B Ball 1/16″ (1.588mm) 98.07 (10) 980.7 (100) Copper alloys, soft steels, alum. Alloys, malleable iron, etc.
C Spheroconical Diamond 98.07 (10) 1471 (150) Steel, hard cast irons,pearltic malleable iron, titanium, deep case hardened steel & other
material harder than HRB 100
D Spheroconical Diamond 98.07 (10) 980.7 (100) Thin steel and medium case hardened steel and pearlitic malleable iron
E Ball – 1/8″ (3.175mm) 98.07 (10) 980.7 (100) Cast iron, aluminum&magnesium alloys and bearing metals
F Ball – 1/16″ (1.588mm) 98.07 (10) 588.4 (60) Annealed copper alloys, and thin soft sheet metals
G Ball – 1/16″ (1.588mm) 98.07 (10) 1471 (150) Malleable irons, copper-nckel-zinc and cupronickel alloys
H Ball – 1/8″ (3.175mm) 98.07 (10) 588.4 (60) Aluminum, zinc and lead
K Ball – 1/8″ (3.175mm) 98.07 (10) 1471 (150) Bearing metals and other very soft or thin materials. Use smallest ball and heaviest
load that does not give anvil effect
L Ball – 1/4″ (6.350mm) 98.07 (10) 588.4 (60)
M Ball – 1/4″ (6.350mm) 98.07 (10) 980.7 (100)
P Ball – 1/4″ (6.350mm) 98.07 (10) 1471 (150)
R Ball – 1/2″ (12.70mm) 98.07 (10) 588.4 (60)
S Ball – 1/2″ (12.70mm) 98.07 (10) 980.7 (100)
V Ball – 1/2″ (12.70mm) 98.07 (10) 1471 (150)