Precision Granite Surface Plate

The majority of our surface plates are produced with black granite.
Upon request, we can also manufacture other granite plates as well. Plates are produced to meet international specification ISO-8512.
Final inspection of our surface plates is done with an autocollimator or electronic levels and Repeat-O-meter.
Special loading and size considerations can be quoted upon request.
In addition to our standard surface plate sizes, we will quote any other size requirements you may have.
We can also make modifications to your plate, which includes t-slots, inserts, holes, etc.

AA GRADE (LABORATORY)
For constant temperature gaging rooms and metrology laboratories.
Size(In.)   Flatness     Thickness      Weight, Lb.
08*12       .000050"       2"           20
12*12       .000050"       3"           45
12*18       .000050"       4"           90
18*18       .000050"       4"           135
18*24       .000075"       4"           180
24*24       .000075"       4"           240
24*36       .000075"       6"           540
24*48       .000150"       8"           960
36*36       .000150"       6"           810
36*48       .000200"       8"           1,440
36*60       .000250"       8"           1,800
36*72       .000300"       10"          2,700
48*48       .000200"       8"           1,920
48*60       .000300"       8"           2,400
48*72       .000350"       10"          3,600
48*96       .000500"       12"          5,760

A GRADE (INSPECTION)
For general use in quality control areas.
Size(In.)   Flatness     Thickness      Weight, Lb.
08*12       .000100"       2"           20
12*12       .000100"       2"           30
12*18       .000100"       3"           75
18*18       .000100"       3"           100
18*24       .000150"       3"           150
24*24       .000150"       4"           240
24*36       .000200"       4"           360
24*48       .000300"       6"           720
36*36       .000300"       6"           810
36*48       .000400"       6"           1,080
36*60       .000500"       6"           1,350
36*72       .000600"       8"           2,160
48*48       .000400"       6"           1,440
48*60       .000600"       6"           1,800
48*72       .000700"       8"           2,880
48*96       .001000"       10"          4,800

B GRADE (TOOLROOM)
For shop work and production checking.
Size(In.)   Flatness     Thickness      Weight, Lb.
08*12       .000200"       2"           20
12*12       .000200"       2"           30
12*18       .000200"       3"           70
18*18       .000200"       3"           100
18*24       .000300"       3"           150
24*24       .000300"       3"           180
24*36       .000400"       4"           360
24*48       .000600"       6"           720
36*36       .000600"       4"           540
36*48       .000800"       6"           1,080
36*60       .001000"       6"           1,350
36*72       .001200"       6"           1,620
48*48       .000800"       6"           1,440
48*60       .001200"       6"           1,800
48*72       .001400"       6"           2,160
48*96       .002000"       8"           3,840
- Other sizes and thicknesses on request.

Surface plate stands:
- Stationary - with leveling screws all four feet.
- Castor - four swivel, load-rated.
- Working height is 36" unless otherwise requested.