Granite Surface Plate 18x6x2 Grade A 0.000025″ – OSKOOL Non‑Corrosive

Description

Product Overview

The O’SKOOL Granite Surface Plate 18x6x2 is engineered to meet the rigorous demands of precision engineering, metrology, and quality control environments. Constructed from a single block of high‑grade solid granite, this plate provides an inherently stable, distortion‑free reference surface that maintains its flatness over time and under varying temperature conditions. With a Grade A classification and an impressive 0.000025″ (0.000635 mm) accuracy tolerance, the plate serves as a reliable foundation for inspection, measurement, marking, and tool calibration tasks. Its dimensions—18 inches long, 6 inches wide, and 2 inches thick—combined with a weight of 21.7 lb (9.85 kg) strike a balance between portability and the mass needed to dampen vibrations during use. The non‑magnetic and non‑conductive nature of granite eliminates interference with magnetic or electronic measuring instruments, making it suitable for a wide range of applications across metalworking, aerospace, automotive, and research laboratories.

Usage

Designed for versatility, this surface plate excels in both workshop and laboratory settings. In a machine shop, technicians rely on the plate to provide a true reference plane for aligning workpieces, checking the flatness of machined components, and calibrating precision tools such as micrometers, dial indicators, and height gauges. In a calibration laboratory, the plate is used as a primary standard for dimensional verification, supporting activities like gauge block stacking, surface roughness assessment, and the setup of coordinate measuring machines (CMMs). Its resistance to moisture and corrosion ensures consistent performance even in humid environments or when exposed to coolant splashes. The plate’s size makes it easy to integrate into existing workstations, and its weight provides the necessary stability to minimize deflection during heavy‑load operations, such as when supporting large metal blanks or during the honing of precision surfaces.

Why Choose Us

Choosing the O’SKOOL Granite Surface Plate means investing in a product that combines material excellence with meticulous manufacturing processes. Each plate undergoes a rigorous quality control protocol that includes laser interferometry testing to verify flatness within the specified tolerance. The granite is sourced from quarries known for low internal stress, ensuring that the plate remains dimensionally stable throughout its service life. Unlike metal plates that can rust or warp, our granite plate is completely non‑corrosive and does not require special coatings or maintenance routines. The plate is also environmentally friendly; granite is a natural, recyclable material that does not emit harmful substances. O’SKOOL stands behind its products with a responsive customer support team ready to assist with installation guidance, calibration advice, and any warranty claims, providing peace of mind for professionals who demand reliability and accuracy.

Key Features

• Ultra‑flat Grade A surface with 0.000025″ accuracy for high‑precision measurements.
• Solid granite construction offers long‑term stability, non‑magnetic and non‑conductive properties.
• Non‑corrosive and moisture‑resistant design eliminates rust and extends service life.
• Compact 18x6x2 dimensions and 21.7 lb weight provide easy handling while minimizing vibration.
• Dedicated O’SKOOL support team ensures expert assistance and reliable after‑sales service.

FAQ

What is the recommended cleaning method for the granite surface plate?

Use a soft, lint‑free cloth slightly dampened with a mild detergent solution to wipe the surface. Avoid abrasive cleaners or solvents that could damage the granite. After cleaning, dry the plate with a clean cloth to prevent moisture retention.

Can this surface plate be used with magnetic measuring tools?

Yes. Because granite is non‑magnetic, it does not interfere with magnetic tools such as magnetic bases or magnetic torque wrenches, allowing accurate measurements without magnetic attraction affecting the setup.

How does temperature affect the flatness of the granite plate?

Granite has a low coefficient of thermal expansion, meaning its dimensions change minimally with temperature fluctuations. For best results, allow the plate to acclimate to the ambient temperature of the workspace for at least 30 minutes before use.

Is the plate covered under any warranty?

O’SKOOL provides a one‑year limited warranty covering manufacturing defects. Should any issues arise within this period, contact our support team for evaluation and replacement options.

What are the typical applications for a surface plate of this size?

This 18x6x2 plate is ideal for precision inspection of small to medium‑sized components, tool calibration, layout work, and as a reference surface for setting up CNC machines, lathes, and milling equipment.