Precision Granite

Precision Granite is a leading manufacturer of granite surface plates, accessories and machine bases. Providing top quality service and products since 1984. They provide the best made precision granite products in the USA.

Precision Granite is ISO 9001 Certified and our granite is quarried in the state of California. Our knowledgeable staff can assist you in selecting the best granite for your product, based in regard to uniformity of surface, accuracy, deflection under load, type of use and price.

The plates are manufactured to meet or exceed the tolerances specified by ASME B89.3.7-2013 and Federal Specification GGG-P-463c. A Precision Granite Calibration Certificate is included with every surface plate guaranteeing overall surface flatness and repeat gage measurements, and is traceable to N.I.S.T. or equivalent National or International Organization, complies with, ANSI/NCSL Z540-1and ISO 10012 in accordance with our ISO 9001 certified quality system. Long-form certification is available. We are an accredited provider of 17025 Calibration Services.

Each plate is made of black granite which is stronger and denser than light colored granite, and more stable. The granite properties determine the stiffness of the granite so accuracies can be guaranteed with less thickness than other types of granite. This translates to less freight and handling whenever the plate is shipped or moved. These plates are offered in three different grades. The grades available are AA Laboratory Grade which is used for high precision operations in temperature controlled gaging rooms and meteorology departments. There is A Inspection Grade for general quality control use, and B Toolroom Grade for shop work and production checking.

Higher Precision is happy to be a distributor of not only Precision Granite plates but the variety of other granite equipment they provide. We are happy to offer comparator stands, tri-squares, master squares, parallels, straight edges, vee blocks, step blocks, riser blocks, angle plates, inserted angle plates, and other accessories.