Granite Surface Plate 18x12x3 In Shop Ready Grade B Precision Ground Flatness To 0.0001 In Meets GGG-P-463C Standard With Certificate Of Inspection Calibrated To Federal Spec And Ready For Metrology And Machining Work Includes HHIP 4401-0012

Precision Granite Surface Plate 18x12x3 in, Grade B
✔️ Single plate with 0.0001 in flatness and inspection cert

This granite surface plate is a flat, stable reference surface used for precision measurement, layout, and inspection in machine shops and labs. It meets the GGG-P-463C Grade B standard and includes a certificate of inspection (not NIST-traceable). Its non-magnetic, non-conductive material makes it ideal for sensitive metrology and assembly work.

✅ Size: 18 in x 12 in x 3 in
✅ Flatness: 0.0001 in on the top surface
✅ Grade: Grade B per GGG-P-463C with inspection certificate
✅ Material: Granite; non-magnetic and non-conductive
✅ Included accessory: 4401-0012 kit

💡 What is a granite surface plate used for in precision measurement and machining?

Granite surface plates provide a stable, flat reference surface for accurate layout, inspection, and calibration.

- Handy for layout, inspection, and calibration in shop environments - Helps verify flatness, squareness, and height using height gauges - Non-magnetic and non-conductive, protecting sensitive tools - Comes with an inspection certificate confirming conformance to GGG-P-463C