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Webster Hardness Tester

The Webster Hardness Testers are a portable, fast, accurate hardness gauge that are made in three distinct models for testing Aluminum, Brass, Copper and Mild Steel. Webster Hardness Testers will quickly identify tempers and test a variety of shapes that other testers cannot check, such as extrusions, tubing and flat stock.

All testers operate in the same manner but differ only in penetrator design, type of load spring and hardness ranges. The principle of operation is simple. The work to be tested is placed between the anvil and the penetrator. Pressure is then applied to the handles until "bottom" is felt at which time the dial indicator is read.

Model B

The Model B Tester is designed to cover the hardness of aluminum alloys from the 100 to the 7075 series. The 20 graduations on the Webster dial indicator covers the range between 25 and 110 on the Rockwell E Scale.

Model B-75

The Model B- 75 Tester was developed to obtain more sensitive response to slight changes in the upper range of hardness covered by the Model B. This sensitivity is particularly useful in testing mild steel and the stronger aluminum alloys. For brass the B-75 covers the range from annealed to full-hard. This added sensitivity is accomplished by incorporating a penetrator of slightly different contour and a heavier load spring than used in the Model B. The 20 graduations on the Webster dial indicator covers the range between 20 and 100 on the Rockwell B Scale.

Model BB-75

The Model BB-75 Tester was developed to answer the need of certain industries for a method of rapidly testing the hardness of electro-deposited copper in the low hardness range. The B-75 penetrator is used to give sensitivity, and the Model B load spring is employed to give light pressures. This combination allows the user to test the soft range of many common materials. The graph below shows the range covered by the Model BB-75 tester on copper.

Applications and Features

Applications for Webster Hardness Testers are:
  • Identifies heat-treated from nonheat-treated parts.
  • Provides correlation between a bench mounted hardness tester and the production line.
  • Segregates materials in stock.
  • Differentiates between soft or work-hardened material.
  • Identifies parts made from improper or substandard alloys.
  • Checks for proper heat-treatment response.
  • Useful in conjunction with stationary laboratory hardness testers. Gives a rapid 100% check on parts which would consume many man hours with slower operating test equipment.
  • Can be used on assemblies that cannot be brought to the labs.
Webster Hardness Testers Feature:
  • One hand operation and portability.
  • Round 3/8 inch diameter anvil permits testing a great variety of shapes.
  • Simple operation permits readings independent of the operator's skill.
  • Test is made by simply applying pressure to the handles until "bottom" is felt.
  • Easy-to-read dial indicator with 20 graduations permits use of the tester as "go" and "no-go" gauge.
  • Standard hardness gauge tests materials up to 1/4 inch in thickness.
  • Increased capacities available up to 1 inch.


Repair and Replacement
Webster Hardness Tester
Parts List For Models B, B-75 And Bb-75
    B B-75 BB-75
A Frame Part No. 103 103 103
B Handle 104 104 104
C Pivot Screw 108 108 108
D Anvil 107 107 107
E Housing Key 112 112 112
F Return Spring 111 111 111
G Penetrator 116 117 117
H Load Spring 110-B 110 110-B
J Penetrator Housing 118 118 118
K Adjusting Nut 106 106 106
L Dial Indicator Assembly 125-B 125-B 125-B

This cutaway view of a Webster Hardness tester shows the working parts common to all testers. Each tester is identified with a model and serial number stamped on the frame and should be mentioned in all correspondence relative to repair or when ordering parts. Penetrators should be examined periodically for wear and replaced with new ones.

Please note the following for replacement parts:

Penetrators and Load Springs differ with each model tester.
All of the other parts are common to all three testers.

To order replacement parts, please contact