* Not actual product image

G-85011 12" x 18" x 4" Surface Plate 85011

Superior Black Granite Surface Plate
12" x 18" x 4" Superior Black Granite Surface Plate - Grade AA, 2 Ledges

12” x 18” (300mm x 450mm) Superior Black Granite Surface Plate with a 4” (100mm) thickness. Superior Black Granite has low water absorption, creates little glare and minimized thermal expansion Grade AA (Laboratory Grade) for precision operations in constant temperature gaging rooms and metrology departments. .000050” (0.0012mm) Flatness unilateral tolerance. Produced with 2 ledges.

Product Testimonials

Contact Starrett


  • Low water absorption minimizes the possibility of precision gages rusting while setting on the plates.
  • This black granite creates little glare resulting in less eyestrain for individuals using the plates.
  • Keeps thermal expansion to a minimum.


  • Made in America: Yes
  • Size LxWxT (in): 12 X 18 X 4
  • Grade (U.S.): AA Laboratory
  • Size LxWxT (mm): 300 X 450 X 100
  • Ledges: Yes


  • G-82250 (82250)
    G-82250 Granite Surface Plate Stand
  • G-82251 (82251)
    G-82251 Granite Surface Plate Stand
  • G-83021 (83021)
    G-83021 Granite Surface Plate Cover
  • G-81824 (81824)
    G-81824 Granite Surface Plate Cleaner
  • G-81320 (81320)
    G-81320 Granite Repeat Reading Gage




    Catalog 33 - Section 20 - Precision Granite Products

    Products and services range from standard surface plates and metrology accessories to engineering collaboration for unique solutions and complex assemblies. Our skilled technicians build your product in our state-of-the-art, environmentally controlled manufacturing facility.

Product Testimonials

    Write a product review