Superior Black Our superior black granite has low water absorption, thus minimizing the possibility of your precision gages rusting while setting on the plates. This black granite creates little glare resulting in less eyestrain for individuals using the plates. We have chosen our superior black granite with the specific intent of keeping thermal expansion to a minimum. Special Requirements Should your application require something other than a standard surface plate, we can provide you with custom options. Starrett can produce your plate from pink, black or gray granite. Custom sizes and thicknesses are available upon request to meet your needs. We can also add holes,counterbores,threaded or solid stainless steel inserts,and t-slots to your surface plate. Contact Starrett Tru-Stone for assistance. How to Order Specify: 1. Surface size of plate 2. Grade AA, A or B tolerance 3. Number of ledges Granite Surface Pla tes Grade AA Laboratory No Ledge Two Ledge Surface Size Thickness Flatness Unilateral Tolerance Weight EDP EDP in mm in mm in mm lb kg 12 x 12 300 x 300 4 100 .000050 0.0012 61 28 85006 85007 12 x 18 300 x 450 92 42 85010 85011 18 x 24 450 x 600 .000075 0.0019 183 83 85028 85029 24 x 24 600 x 600 244 111 85036 85037 24 x 36 600 x 900 6 150 .000100 0.0025 549 249 85055 85056 30 x 48 750 x 1200 8 200 .000168 0.0043 1220 553 85082 85083 36 x 36 900 x 900 6 150 .000150 0.0038 824 374 85090 85091 36 x 48 900 x 1200 8 200 .000200 0.0050 1464 664 85110 85111 36 x 60 900 x 1500 10 250 .000250 0.0063 2288 1038 85118 85119 36 x 72 900 x 1800 12 300 .000300 0.0076 3294 1494 85128 85129 48 x 48 1200 x 1200 8 200 .000200 0.0051 1952 885 85136 85137 48 x 72 1200 x 1800 10 250 .000350 0.0088 3660 1660 85155 85156 48 x 96 1200 x 2400 12 300 .000500 0.0127 5856 2656 85173 85174 Grade A Inspection No Ledge Two Ledge Surface Size Thickness Flatness Unilateral Tolerance Weight EDP EDP in mm in mm in mm lb kg 12 x 12 300 x 300 4 100 .000100 0.0025 61 28 85008 85009 12 x 18 300 x 450 92 42 85013 85014 18 x 24 450 x 600 .000150 0.0038 183 83 85031 85032 24 x 24 600 x 600 844 111 85038 85039 24 x 36 600 x 900 6 150 .000200 0.0050 549 249 85058 85059 30 x 48 750 x 1200 .000400 0.0102 915 415 85085 85086 36 x 36 900 x 900 .000300 0.0076 824 374 85092 85091 36 x 48 900 x 1200 .000400 0.0102 1098 498 85113 85114 36 x 60 900 x 1500 8 200 .000500 0.0127 1830 830 85120 85121 36 x 72 900 x 1800 10 250 .000600 0.0152 2745 1245 85131 85132 48 x 48 1200 x 1200 6 150 .000500 0.0130 1464 664 85138 85139 48 x 72 1200 x 1800 8 200 .000700 0.0177 2928 1328 85158 85159 48 x 96 1200 x 2400 10 250 .001000 0.0254 4880 2214 85176 85177 Grade B Toolroom No Ledge Two Ledge Surface Size Thickness Flatness Unilateral Tolerance Weight EDP EDP in mm in mm in mm lb kg 12 x 12 300 x 300 3 75 .000200 0.0050 46 21 85012 85015 12 x 18 300 x 450 69 31 85016 85017 18 x 24 450 x 600 .000300 0.0076 136 62 85034 85035 24 x 24 600 x 600 4 100 .000300 0.0076 244 111 85040 85041 24 x 36 600 x 900 .000400 0.0102 366 166 85061 85062 30 x 48 750 x 1200 6 150 .000700 0.0180 915 415 85088 85089 36 x 36 900 x 900 .000600 0.0152 824 374 85094 85095 36 x 48 900 x 1200 .000800 0.0203 1098 498 85116 85117 36 x 60 900 x 1500 .001000 0.0254 1373 623 85122 85123 36 x 72 900 x 1800 8 200 .001200 0.0304 2196 996 85134 85135 48 x 48 1200 x 1200 6 150 .000900 0.0229 1464 664 85140 85141 48 x 72 1200 x 1800 8 200 .001400 0.0355 2196 996 85161 85162 48 x 96 1200 x 2400 .002000 0.0508 3904 1771 85179 85180 Other sizes available by request. No ledge and two ledge plates listed, four ledge plates available by request. Superior Black Granite Surface Plate 416 G ranite S urface P roducts