Gauge Blocks, Granite Surface Plates & Accessories

Gauge blocks are precision‑ground bars used to calibrate measuring equipment and inspect tolerances.  Granite surface plates provide a flat reference surface for inspection and layout work.  Together, they form the foundation of precision metrology.

Can gauge blocks be used on their own, or must they be wrung together?
They can be used individually for certain reference measurements, but their real versatility comes from wringing blocks together to build custom lengths with extreme precision.

How do I check if my granite surface plate is still accurate?
Surface plates should be inspected periodically using a certified straightedge or an electronic level. For professional work, they should be re-lapped or certified by a calibration service according to your quality control schedule.

Why do gauge blocks need such careful handling?
Even the slightest scratch, dust particle, or fingerprint can change their effective length. Always handle them with clean hands or gloves, and never slide them on abrasive surfaces.