The Class H tester is built around the standard Charpy specimen sizes used in ISO 148 and ASTM E23. It supports full-size specimens of 2.16 x 0.40 x 0.40 inches (55 x 10 x 10 mm), which are the most common dimensions for metallic impact testing. The machine also accepts sub-size specimens such as 2.16 x 0.40 x 0.30 inches (55 x 10 x 7.5 mm) and 2.16 x 0.40 x 0.20 inches (55 x 10 x 5 mm).

The support span, striker geometry and frame layout are designed to match these dimensions, so operators can switch between full-size and sub-size bars without needing a different machine. Centering blocks and tongs help position each specimen correctly over the supports and under the striker.

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