Why Granite Surface Plate Calibration is Important


Surface plates are used for mounting mechanical, electronic, and optical gaging systems. Many laboratories and shops rely specifically on granite surface plates for precise measurement and inspection. Every measurement depends on an accurate surface reference from which dimensions are taken, and granite plates offer the perfect base for gaging surfaces and making accurate height measurements. Another reason granite is the most popular material used for surface plates is because it has a low sensitivity to temperature fluctuations and a hard surface.


However, over time, surface plates can wear, which prevents them from being able to make accurate measurements. That’s why it’s imperative to keep them properly maintained and calibrated regularly.


A surface plate that is calibrated will present a high degree of flatness and stability, ensuring a level surface to work with so accurate workmanship can be achieved. While calibration should be performed regularly to maintain its flatness and measurement accuracy, there are other things you can do to ensure you’re providing the best care possible for your plates.


Tips for Taking Care of your GRANITE Surface Plates:

– Keep the plate cleaned
– Cover the plate when it’s not in use
– Rotate the plate periodically, if possible
– Make sure nothing else is placed on the plate except gages and other measuring pieces
– Don’t over-use it or use the same spot on the plate each time


Rely on Precision Gage as your Calibration Company of Choice

At the end of 2015, Precision Gage Company acquired Astral Precision Equipment Corp., a well renowned granite surface plate and accessory manufacturer and calibration service provider in the midwest.  As a manufacturer of granite products, we are uniquely positioned to provide the best quality service and value to our customers.  A quick list of services we provide are:

  • On-site Granite Surface Plate Laser Calibration
  • On-site Granite Surface Plate Resurfacing
  • Regrinding of Surface Plates at our Facility (Makes old chipped plates back as good as new at a fraction of the price of lapping)
  • Repair of Granite Accessories
    • Angle Blocks
    • Parallels
    • Vee Blocks
  • Modification of existing granite products
    • Addition of threaded inserts
    • Additon of though holes
  • ISO17025 Accredidation in September 2018

Out of all the calibration companies out there, Precision Gage Company is a trusted leader in the manufacturing and OEM industry, offering proven production measurement solutions. Our team has decades of experience manufacturing granite products, offering calibration and resurfacing services with attention to accuracy and detail.


For over 65 years, we have been supplying the best rated inspection tools for all measurement and verification needs. Specializing in dimensional gage calibration, we are focused on making sure measuring equipment performs at its best for our customers.


Our talented team of professionals utilize the highest-quality equipment and perform our granite surface plate calibrations on-site in our 1,000 square foot lab.


Our astral granite products offer superior wear-resistance and low porosity, so it doesn’t absorb a high amount of moisture, preventing gages from rusting and ensuring smooth movement.


At Precision Gage, we are dedicated to understanding your issues and crafting solutions that are budget-friendly and effective. Learn more about the resurfacing and calibration products and services we provide and reach out to us for more information!

« Back to Blog

Latest Blog Entries

Visit us at the Motion + Power Technology Expo in St. Louis, Sept. 14-16, 2021

BOOTH# 2618, America’s Center Convention Complex, St. Louis, MO If you’re planning on attending AGMA’s Motion + Power Technology Expo (formerly Gear Expo) in St. Louis in Sept, please plan on visiting us at Booth# 2618! We also have a…



Precision Gage Co. is excited to share Mahr’s November special offer on the Digimar 814 SR Scribing and Measuring Height Gage.   Digital measurement enables quick and error-free reading of results. The Digimar 814 SR allows for easy measurement of…


Mitutoyo Virtual Tradeshow and FORMTRACER Offer

Precision Gage Co. is excited to announce the launch of the FORMTRACER Avant Series from Mitutoyo for measurement of both contour and surface roughness features!   Equipped with “speed” enabling higher measurement efficiency, “operability” with automation and a wide variety…