HHIP 4401-1812 Black Granite Surface Plate Grade A 18x12x3 inches

Description

Product Overview

The HHIP 4401-1812 black granite surface plate is engineered to meet the demanding requirements of precision engineering, metrology, and quality control environments. Constructed from high‑grade black granite that complies with Federal Specification GGG‑P‑463C, the plate provides a hard, wear‑resistant surface that maintains its flatness over years of use. The top surface is precision ground to achieve Grade A (Grade 0) flatness, guaranteeing an accuracy of +/-0.000050 inch across the entire 18x12x3 inch footprint. Weighing 80 pounds, the plate offers the mass needed for stability while remaining manageable for transport and installation on standard workbenches.

Each plate is accompanied by a certificate of inspection that documents its compliance with dimensional tolerances and flatness specifications. Although the plates are not NIST‑traceable, they are inspected with an auto‑collimator to ensure consistent performance across the product line. The black granite material is non‑magnetic and non‑conductive, making it suitable for use around sensitive electronic equipment and in environments where magnetic interference must be avoided.

Usage

Designed for a wide range of applications, this surface plate serves as a reliable reference surface for measuring flatness, squareness, and parallelism of machined components. It is ideal for calibrating precision instruments such as coordinate measuring machines (CMMs), height gauges, and surface roughness testers. In addition, the plate functions as a sturdy work surface for assembling, inspecting, and marking parts, providing a stable platform that resists deformation under load.

Typical users include metrology technicians, quality assurance engineers, toolmakers, and research laboratory staff. Whether you are setting up a machining center, performing a dimensional inspection, or laying out a prototype, the HHIP surface plate delivers the consistency required for repeatable results. Its compact size allows it to fit comfortably on standard benches, while the substantial weight ensures minimal vibration during high‑precision operations.

Why Choose Us

HHIP has a long history of supplying high‑quality calibration equipment to industrial and scientific markets. Our surface plates are manufactured in controlled environments, and each unit undergoes rigorous inspection before leaving the factory. The inclusion of a detailed inspection certificate provides confidence in the plate’s performance and traceability within your quality management system.

We stand behind our products with responsive customer support and a clear warranty policy. Should you require assistance with installation, calibration verification, or any technical question, our knowledgeable team is ready to help. By choosing HHIP, you benefit from a combination of proven material performance, precise manufacturing, and dedicated after‑sales service.

Key Features

• Grade A flatness ensures +/-0.000050 inch accuracy for critical measurements
• Durable black granite surface resists wear, scratches, and corrosion
• Non‑magnetic, non‑conductive material protects sensitive electronic equipment
• Compact 18x12x3 inch size balances portability with stability
• Comprehensive inspection certificate and dedicated customer support

FAQ

What does Grade A flatness mean for my applications?

Grade A flatness indicates that the plate meets the highest industry standard for surface flatness, providing an accuracy of +/-0.000050 inch. This level of precision is essential for tasks such as checking the squareness of machine tools, calibrating measurement devices, and ensuring the dimensional integrity of critical components.

Is the surface plate NIST‑traceable?

The plate is not NIST‑traceable, but it is inspected with an auto‑collimator and comes with a certificate of inspection that verifies compliance with the specified flatness and dimensional tolerances. For most industrial and laboratory applications, this level of verification is sufficient.

Can I use this plate in a magnetic environment?

Yes. The black granite material is inherently non‑magnetic and non‑conductive, making the plate safe to use around magnetic fields and electronic equipment without risk of interference.

How should I maintain the surface plate to preserve its accuracy?

Keep the plate clean by wiping it with a soft, lint‑free cloth and a mild solvent if necessary. Avoid using abrasive cleaners or metal tools that could scratch the surface. Store the plate in a stable, temperature‑controlled environment to prevent thermal distortion.

What warranty and support does HHIP provide?

HHIP offers a standard one‑year warranty covering manufacturing defects. Our technical support team is available to answer questions about installation, calibration verification, and routine maintenance, ensuring you get the most out of your surface plate throughout its service life.