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Rockwell Hardness Calibration Test Blocks
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Make sure your hardness testers are accurately calibrated. Blocks are marked with their corresponding Rockwell hardness and a serial number.
All blocks come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.
Rockwell Hardness Scale | Accuracy | Ht. | Wd. | Dp. | Specs. Met | Choose a Hardness | Each | ||
|---|---|---|---|---|---|---|---|---|---|
| A | ±5 | 2" | 2" | 1/4" | ASTM E18 | Rockwell A30, Rockwell A40, Rockwell A50, Rockwell A54, Rockwell A55, Rockwell A60, Rockwell A61, Rockwell A70, Rockwell A80 | 12105T54 | 0000000 | |
| B | ±5 | 2" | 2" | 1/4" | ASTM E18 | Rockwell B30, Rockwell B40, Rockwell B50, Rockwell B60, Rockwell B65, Rockwell B70, Rockwell B75, Rockwell B80, Rockwell B85, Rockwell B90, Rockwell B100 | 12105T55 | 000000 | |
| C | ±5 | 2" | 2" | 1/4" | ASTM E18 | Rockwell C20, Rockwell C25, Rockwell C30, Rockwell C33, Rockwell C35, Rockwell C36, Rockwell C40, Rockwell C44, Rockwell C45, Rockwell C50, Rockwell C55, Rockwell C58, Rockwell C60, Rockwell C62, Rockwell C63 | 12105T53 | 000000 | |
| E | ±5 | 2" | 2" | 1/4" | ASTM E18 | Rockwell E75, Rockwell E80, Rockwell E85, Rockwell E90, Rockwell E100 | 12105T56 | 000000 |
