What is surface plate?

A surface plate is a flat, precision-ground metal plate typically used as a reference plane for inspection, layout, and tooling purposes in manufacturing and engineering applications. These plates are made from materials such as granite, cast iron, or steel to provide a stable and rigid surface for measuring and inspecting parts.

Surface plates are available in various sizes, shapes, and grades of accuracy, with some plates featuring additional features such as ledges, handles, and accurately machined edges for easier handling and positioning. They are commonly used in machine shops, quality control departments, and metrology labs for checking the flatness, parallelism, and squareness of workpieces, as well as for mounting precision tools and equipment.

To ensure the accuracy and reliability of a surface plate, regular cleaning and maintenance, such as leveling and calibration, are essential. It is also important to handle these plates with care and avoid damaging the surface by using appropriate inspection tools and techniques.