12 Inch By 9 Inch By 2 Inch Granite Surface Plate Grade B With Zero Ledge, Precision Ground For Flatness To 0.0001 Inch, Meets GGG P-463C Standards, Includes Certificate Of Inspection

12x9x2 Granite Surface Plate, Grade B with Zero Ledge
✔️ Precision ground top, 0.0001 in flatness, Grade B, single unit

The granite surface plate is a Grade B (Grade 1) reference surface used to check flatness and squareness, lay out parts, calibrate instruments, and set up tools in machining and inspection environments. The top surface is precision ground to 0.0001 in flatness, and the plate includes a Certificate of Inspection. It meets the federal specification GGG-P-463C but is not NIST traceable. The plate is non-magnetic and non-conductive, providing a stable work surface for assembling, inspecting, and marking parts.

✅ Size: 12 in x 9 in x 2 in (304.8 mm x 228.6 mm x 50.8 mm)
✅ Flatness: ±0.0001 in across the top surface
✅ Grade B (Grade 1) with zero ledge
✅ Meets GGG-P-463C with Certificate of Inspection

💡 What is a granite surface plate used for in precision work?

Handy tool for accurate layout, inspection, and setup in machining and labs. - 0.0001 in flatness across the top surface for repeatable measurements
- Non-magnetic and non-conductive surface minimizes interference during checks
- Certificate of Inspection confirms GGG-P-463C compliance
- Provides a stable work surface for assembling and marking parts