Metrology Material, Precision Measuring, Hardness Testers Phase II Plus Register
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21 Industrial Ave.
Upper Saddle River, NJ 07458
Phone: 201-962-7373
Toll Free: 800-526-9087
Fax: 201-962-8353


Model No. 900-331

This hardness tester comprises the very best in  state of the art design along with dynamic precision only found at Phase II. The 900-331 Rockwell scale hardness tester is easy to operate, yet engineered to obtain highly sensitive and accurate readings. Conforming to ASTM E-18 Rockwell Hardness standards, the 900-331 tester will offer unmatched repeatability in all standard Rockwell Hardness scales (table shown below). A perfect, rugged performer suited for any environment including heat treat facilities, tool rooms, workshops, laboratories and inspection labs. Lifetime technical support is included on all Phase II Hardness Testers. So test away with confidence and a level of accuracy you will only find at Phase II.

  • Direct analog dial reading
  • Advanced design, easy to operate
  • Engineered to obtain highly sensitive and accurate readings
  • Conforms to ASTM E-18
Perfect for laboratories, workshops, tool rooms, inspection labs, etc.


Minor Load 10Kgf
Major Load 60Kgf, 100Kgf, 150Kgf
Test Force Application Dead Weight
Test Force Control Hydraulic Dashpot System
Results Display Analog Dial Gage
Vertical Capacity 6.7 in.
Throat Depth 6.6 in.
Height 30.0 in.
Width 8.50 in.
Depth 20.0 in.
Shipping Weight 242 lbs.

  • C-scale Diamond Indentor
  • 1/16 Ball Indentor
  • 3- HRC Test Blocks
  • 1- HRB Test Block
  • 1-HRA Test Block
  • Test Table 5.87 (150mm)
  • Flat Anvil 2.5 (63mm)
  • Spot Anvil .38: (10mm)
  • Std. Vee Anvil
  • Accessory Case
  • Dust Cover
rockwell hardness tester phase II precision analog
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)

Related Products
  1. For testing very thin, soft metals, please click here for the Phase II Superficial Rockwell Hardness Tester, 900-340.
  2. For the Phase II Digital Rockwell Hardness Tester, click here for 900-360.
  3. For testing of both Rockwell and Superficial Rockwell scales, click here for the Phase II 900-370.
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  Phase II Plus
21 Industrial Ave.
Upper Saddle River, NJ 07458
Phone: 201-962-7373
Toll Free: 800-526-9087
Fax: 201-962-8353
Click here for a free catalog