HHIP 4401-2418 24 x 18 x 3″ Grade A Granite Surface Plate is a precision-grade granite surface plate designed for highly accurate measurement, inspection, and layout work. The top surface is precision ground to achieve a flatness tolerance of ±0.000075″, making it ideal for calibrating instruments, checking parallelism and perpendicularity, and providing a stable reference surface for precision work.
Features:
- Grade A (Grade 0) granite surface plate for high-accuracy applications.
- Precision-ground top surface with ±0.000075″ flatness tolerance.
- Size: 24″ x 18″ x 3″ with ledge design for stability and convenience.
- Non-magnetic and non-conductive material, resistant to nicks and burrs.
- Certified inspection included (not NIST traceable).
- Meets or exceeds Federal Specifications GGG-P-463C.
- Checked by auto collimator to ensure overall accuracy.
Benefits:
- Provides an extremely flat and stable reference surface for measurement and inspection.
- Durable granite material ensures long-lasting accuracy and wear resistance.
- Non-magnetic and non-conductive properties make it safe for a wide range of applications.
- Facilitates precise setup of tools, parts inspection, and instrument calibration.
- Versatile use for layout work, assembly, and quality control tasks.
Technical Specifications:
- Model: 4401-2418
- Dimensions: 24″ x 18″ x 3″
- Grade: Grade A (Grade 0)
- Flatness Tolerance: ±0.000075″
- Material: Granite
- Surface Finish: Precision ground
- Applications: Measuring flatness, layout work, instrument calibration, tool setup, part inspection
- Compliance: Meets/exceeds Federal Specs GGG-P-463C








