Surface Plate, Granite, 12" x 9" x 2"
- Black granite surface plate, Grade B
- Accuracy is ±0001"
- 12" x 9" x 2"
- Meets or exceeds Federal Specifications GGG-P-463C
- Harder than steel and does not nick or burr
Black granite surface plate used as a horizontal reference plane for tooling setup, precision inspection and layout.
These surface plates are checked with an auto-collimator for overall accuracy. All points on the surface are between two parallel planes ±0001" apart.