precision black granite surface plate

A precision black granite surface plate is a high-accuracy measuring tool used in machining,inspection,and quality control applications.It provides a flat,stable reference surface for precise measurements.Below is a detailed overview based on available information:

Key Features of Precision Black Granite Surface Plates

Material&Durability

Made from black granite,known for exceptional hardness(6–7 on the Mohs scale)and resistance to wear,corrosion,and temperature variations.

Granite's stability ensures minimal distortion over time,making it ideal for precision work.

Dimensions&Specifications

Common sizes include:

24×36 inches(5-inch height)–Mitutoyo model with±0.0001"flatness and NIST traceable certification.

1000×750 mm(approx.39×30 inches)–Mitutoyo model with 0.005 mm flatness and AA grade.

Smaller options(e.g.,18×18 inches)are also available,typically for lighter inspection tasks.

Accuracy&Applications

Flatness tolerance:Ranges from±0.0001 inches(Mitutoyo)to±0.005 mm,depending on grade.

Used in manufacturing,engineering labs,and metrology for calibrating instruments,inspecting parts,and ensuring dimensional accuracy.

Additional Features

Lapped surface finish for smoothness.

Optional accessories:Stands,leveling screws,protective covers.

NIST traceable certification for calibrated plates.

Purchasing Options

New:Available through precision tool suppliers(e.g.,Micro Precision)with calibration services.

Used:Platforms like eBay offer lower-cost options(e.g.,100–100–120 for an 18×18"plate),though shipping costs can be high.

Comparison with Other Materials

Granite vs.Marble:Granite is harder(Mohs 6–7 vs.marble’s 3–4),making it more scratch-resistant.

Granite vs.Quartz:Comparable hardness,but granite is natural,while quartz is engineered.

For calibration or procurement,contacting specialized vendors like Micro Precision is recommended due to their global lab network and certification services.