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
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.
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.
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
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 for Webster
Hardness Testers are:
Identifies heat-treated from
Provides correlation between
a bench mounted hardness tester and the production line.
Segregates materials in
Differentiates between soft
or work-hardened material.
Identifies parts made from
improper or substandard alloys.
Checks for proper
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
One hand operation and
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"
Standard hardness gauge tests
materials up to 1/4 inch in thickness.