Specimens
Flat specimens should be tested on a smooth, flat anvil whose surface is perpendicular to the axis of the
indenter.
Cylindrical specimens should be tested using a V-grooved anvil that supports the specimen with the V-groove
directly under the indenter. Alternatively, you can use hard, parallel twin cylinders positioned and clamped at
the base.
For thin specimens or specimens that are not perfectly flat, an anvil with an elevated flat spot approximately
6mm in diameter should be used. The spot must be polished smooth and have a Rockwell hardness of at least
60 HRC. Very soft material should not be tested using the spot anvil because the applied force may result in
penetration of the anvil into the underside of the specimen.