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Granite Surface Plate With High Precision

- Jan 01, 2018 -

 granite surface plates are available in three grades. The repeat reading tolerances for each grade are as follows:

  • Grade AA Laboratory - 25 millionths

  • Grade A Inspection - 50 millionths

  • Grade B Toolroom - 100 millionths

All plates have a thickness capable of supporting a total normal load equal to 100 pounds for each square foot of surface plate area loaded in the center of the plate without deflecting the plate along a diagonal more than one-half the flatness tolerance (per Federal Specification GGG-P-463c).

   Part #
By # of ledges
  
Size (Inches)Thickness (Inches)GradeNone24Overall
Unilateral
Accuracy
Approx.
Ship
Weight
8x123AAGAA-0812-0GAA-0812-2GAA-0812-40.00004550 lbs
8x122AGA-0812-0GA-0812-2GA-0812-40.000940 lbs
8x122BGB-0812-0GB-0812-2GB-0812-40.0001840 lbs
12x124AAGAA-1212-0GAA-1212-2GAA-1212-40.0000560 lbs
12x124AGA-1212-0GA-1212-2GA-1212-40.000160 lbs
12x123BGB-1212-0GB-1212-2GB-1212-40.000250 lbs
12x184AAGAA-1218-0GAA-1218-2GAA-1218-40.0000590 lbs
12x184AGA-1218-0GA-1218-2GA-1218-40.000190 lbs
12x183BGB-1218-0GB-1218-2GB-1218-40.000270 lbs
18x184AAGAA-1818-0GAA-1818-2GAA-1818-40.00006135 lbs
18x184AGA-1818-0GA-1818-2GA-1818-40.00012135 lbs
18x183BGB-1818-0GB-1818-2GB-1818-40.00024100 lbs
18x244AAGAA-1824-0GAA-1824-2GAA-1824-40.000065175 lbs
18x244AGA-1824-0GA-1824-2GA-1824-40.00013175 lbs
18x243BGB-1824-0GB-1824-2GB-1824-40.00026130 lbs
24x246AAGAA-2424-0GAA-2424-2GAA-2424-40.00007275 lbs
24x244AGA-2424-0GA-2424-2GA-2424-40.00014230 lbs
24x244BGB-2424-0GB-2424-2GB-2424-40.00028230 lbs
24x366AAGAA-2436-0GAA-2436-2GAA-2436-40.000085520 lbs
24x366AGA-2436-0GA-2436-2GA-2436-40.00017520 lbs
24x364BGB-2436-0GB-2436-2GB-2436-40.00034340 lbs
24x488AAGAA-2448-0GAA-2448-2GAA-2448-40.00015925 lbs
24x486AGA-2448-0GA-2448-2GA-2448-40.0003690 lbs
24x486BGB-2448-0GB-2448-2GB-2448-40.0006690 lbs
30x366AAGAA-3036-0GAA-3036-2GAA-3036-40.0001675 lbs
30x366AGA-3036-0GA-3036-2GA-3036-40.0002675 lbs
30x366BGB-3036-0GB-3036-2GB-3036-40.0004675 lbs
36x366AAGAA-3636-0GAA-3636-2GAA-3636-40.0001780 lbs
36x366AGA-3636-0GA-3636-2GA-3636-40.0002780 lbs
36x366BGB-3636-0GB-3636-2GB-3636-40.0004780 lbs
36x488AAGAA-3648-0GAA-3648-2GAA-3648-40.000151360 lbs
36x486AGA-3648-0GA-3648-2GA-3648-40.00031100 lbs
36x486BGB-3648-0GB-3648-2GB-3648-40.00061100 lbs
36x6010AAGAA-3660-0GAA-3660-2GAA-3660-40.00022125 lbs
36x608AGA-3660-0GA-3660-2GA-3660-40.00041700 lbs
36x606BGB-3660-0GB-3660-2GB-3660-40.00081275 lbs
36x7212AAGAA-3672-0GAA-3672-2GAA-3672-40.000253060 lbs
36x7210AGA-3672-0GA-3672-2GA-3672-40.00052550 lbs
36x728BGB-3672-0GB-3672-2GB-3672-40.0012040 lbs
48x6010AAGAA-4860-0GAA-4860-2GAA-4860-40.000252850 lbs
48x608AGA-4860-0GA-4860-2GA-4860-40.00052300 lbs
48x606BGB-4860-0GB-4860-2GB-4860-40.0011700 lbs
48x7212AAGAA-4872-0GAA-4872-2GAA-4872-40.00034080 lbs
48x7210AGA-4872-0GA-4872-2GA-4872-40.00063400 lbs
48x728BGB-4872-0GB-4872-2GB-4872-40.00122720 lbs
48x9614AAGAA-4896-0GAA-4896-2GAA-4896-40.00046350 lbs
48x9612AGA-4896-0GA-4896-2GA-4896-40.00085440 lbs
48x9610BGB-4896-0GB-4896-2GB-4896-40.00164540 lbs

Certificate

Final inspection and calibration of every surface plate is accomplished by use of an Auto-Collimator. A certificate of accuracy, traceable to the National Institute of Standards and Technology, is furnished with all surface plates.

Color

Charcoal Black granite is standard except for plates larger than 48” x 72” which are Sierra Grey. Pink Granite is available as an option in most sizes.

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