In metrology laboratories, precision testing centers, and university research facilities, the accuracy of experimental results and calibration data depends heavily on the quality of the reference tools used. A metrology grade granite surface plate is one such essential tool-it serves as a flat, stable reference surface for measuring the flatness, straightness, and dimensional accuracy of precision parts, instruments, and experimental equipment. Unlike ordinary surface plates, metrology grade granite surface plates are manufactured to the highest precision standards, with ultra-high flatness, stability, and durability. As a professional factory specializing in the production and export of metrology grade granite surface plates, we are dedicated to providing global laboratory and industrial customers with high-quality products that meet the strictest international metrology standards.
Metrology grade granite surface plates are made from high-quality natural black granite, which is carefully selected for its fine grain structure, uniform density, and excellent physical properties. The choice of raw material is critical-only granite with minimal impurities, no cracks, and consistent grain size can be used to produce metrology grade surface plates. Our factory sources granite from reputable quarries in China, ensuring that each batch of raw material meets our strict quality standards. The granite is then subjected to a natural aging process, which is essential for eliminating internal stress. This aging process typically takes 6-12 months, during which the granite is stored in a controlled environment to allow internal stresses to dissipate. Without proper aging, the granite may deform over time, leading to a loss of flatness and accuracy-something that is unacceptable in metrology applications.
After the aging process, the granite undergoes a series of precision machining steps to achieve the required flatness and surface finish. We use advanced CNC grinding equipment and diamond grinding tools, which are capable of achieving ultra-high precision. The grinding process is carried out in multiple stages: first, the rough grinding stage removes excess material and shapes the surface plate; then, the fine grinding stage refines the surface, improving flatness and smoothness; finally, the polishing stage achieves a mirror-like surface finish, reducing friction and ensuring accurate measurements. Our metrology grade surface plates are available in three precision grades: Grade 00 (the highest), Grade 0, and Grade 1, each with specific flatness tolerances to meet different application needs.
Grade 00 granite surface plates are designed for the most demanding metrology applications, such as laboratory calibration, precision instrument testing, and aerospace component measurement. They have a flatness tolerance of up to ±0.001mm/m, making them ideal for use in national metrology institutes, research laboratories, and high-precision manufacturing facilities. Grade 0 surface plates are suitable for general laboratory use and precision workshop inspection, with a flatness tolerance of ±0.002mm/m. Grade 1 surface plates are used for routine inspection and general measurement tasks, with a flatness tolerance of ±0.004mm/m. We can also provide custom precision grades and sizes to meet specific customer requirements.
One of the key advantages of metrology grade granite surface plates is their excellent dimensional stability. Granite has a very low coefficient of thermal expansion, which means it does not expand or contract significantly with changes in temperature. This is crucial for laboratory environments, where temperature fluctuations can affect the accuracy of measurements. Unlike cast iron surface plates, which are prone to rust, deformation, and magnetic interference, granite surface plates are non-magnetic, non-conductive, and corrosion-resistant. They do not require frequent maintenance, such as oiling, and can be used in humid or corrosive environments without degradation.
Our metrology grade granite surface plates are available in a wide range of standard sizes, from small bench-top models (300mm×200mm) to large industrial-size plates (2000mm×1500mm). For customers who need larger surface plates, we offer custom large-size splicing plates, which are made by joining multiple granite slabs with precision. The splicing process is carried out using advanced techniques to ensure that the joint is seamless and that the entire surface maintains uniform flatness. These large-size surface plates are ideal for measuring large precision parts, such as machine tool beds, mold bases, and aerospace components.
Quality control is a top priority in our production process. Every metrology grade surface plate undergoes strict inspection before shipment, including flatness testing, surface finish testing, and dimensional measurement. We use advanced measuring equipment, such as laser interferometers and coordinate measuring machines (CMM), to ensure that all products meet the required precision standards. We also provide inspection reports and certification documents, such as ISO 9001, CE, and SGS, to give our overseas customers full confidence in the quality of our products.
As a factory direct export supplier, we offer competitive prices and flexible customization options. We support OEM & ODM services, allowing customers to customize the size, precision grade, surface finish, and even the logo of the surface plates. Our team of professional engineers can work closely with customers to optimize the design, ensuring that the surface plate meets their specific application needs. We also provide free technical consultation, helping customers choose the right precision grade and size for their requirements.
In terms of logistics and delivery, we have rich experience in international shipping. We work with reputable shipping companies to provide door-to-door logistics solutions, covering Europe, North America, Southeast Asia, and other regions. We handle all export documentation, including commercial invoices, packing lists, bills of lading, and customs declarations, ensuring that the products arrive at the customer's location on time and without hassle. Our packaging is designed to protect the surface plates during transportation-we use foam packaging, wooden crates, and shock-absorbing materials to prevent damage from collisions or vibrations.
Our metrology grade granite surface plates are widely used in various industries, including aerospace, automotive, electronic manufacturing, mold processing, and university laboratories. They are trusted by customers around the world for their precision, stability, and durability. Whether you need a standard-size Grade 00 surface plate for laboratory calibration or a custom large-size splicing plate for industrial measurement, we can provide you with a high-quality product that meets your needs.
If you are looking for a reliable factory supplier of metrology grade granite surface plates, contact us today. We will provide you with a detailed quotation, technical specifications, and inspection reports, and work with you to find the perfect solution for your metrology needs. We are committed to building long-term cooperative relationships with our global customers, providing reliable products and professional services.