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G-85007 12" x 12" x 4 " Surface Plate 85007

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

12” x 12” (300mm x 300mm) 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.

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


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