GRANITE SURFACE PLATES

Granite Surface Plates are used for precision gauging, inspection, layout and marking purposes. They are preferred by Precision Tool Rooms, Engineering Industries and Research Laboratories because of their following outstanding advantages:
No rust, no corrosion, relatively warp-free, no compensation hump when nicked, longer wear, smoother action, greater precision, nonmagnetic, less care after commissioning, lower co-efficient of thermal expansion and non-glaring surface.

SALIENT FEATURES

• Made from close grained Granite having uniform colour & texture having hardness between 5.6 to 7 on Moh's scale, sound and free from flaws fissures and large inclusions of softer minerals.
• Made generally as per IS-7327-2003. Also available on request conforming to DIN-876-1972, BS-817-1988, JIS-B-7513 and US Federal specification GGG-P-463-C.
• Rexine cover provided for top working surface with each Surface Plate.
• MS Fabricated Stand / Cupboard type / Cast Iron individual Column type Stand/Granite special Stand with Vibration Isolation Plates with leveling screws are available on request at extra cost.
• 'Metalic threaded inserts, Metalic T-slots, Plates with two or four ledges also can be supplied against specific request at extra cost..

STANDARD SIZES AND TOLERANCE OF FLATNESS
Size in mm	Flatness tolerances of various Grades (microns)
(L x B)	Grade - 0	Grade - 1	Grade - 2	Grade - 3
160 X 100	3.0	6.0	12.0	25.0
250 X 160	3.5	7.0	14.0	27.0
250 X 250	3.5	7.0	15.0	30.0
400 X 250	4.0	8.0	16.0	32.0
400 X 400	4.5	9.0	17.0	34.0
630 X 400	5.0	10.0	20.0	39.0
630 X 630	5.0	10.0	21.0	42.0
1000 X 630	6.0	12.0	24.0	49.0
1000 X 1000	7.0	14.0	28.0	56.0
1600 X 1000	8.0	16.0	33.0	66.0
2000 X 1000	10.0	19.0	38.0	76.0
2500 X 1600	11.5	23.0	46.0	92.0

Surface Plates are provided with NABL calibration certificate traceable to National standards from our in-house calibration Laboratory including a contour plot of flatness deviation as shown below.

NON-STANDARD AND LARGES SIZES
500 X 500	600 X 450	600 X 600
750 x 500	750 X 600	800 X 600
900 X 600	1000 X 500	1000 X 600
1000 x 750	1200 x 800	1200 x 900
1200 x 1200	1500 x 750	1500 x 1000
1500 x 1200	1500 x 1500	1800 x 1200
2000 x 1250	2000 x 1500	2000 x 2000
2400 x 1200	2500 x 1000	2500 x 1500
2500 x 1600	2500 x 2000	3000 x 1000
3000 x 1250	3000 x 1500	3000 x 2000
3000 x 2500	3000 x 3000	4000 x 1000
4000 x 1500	4000 x 2000	4000 x 2500
4000 x 3000	5000 x 1000	5000 x 2000
6000 x 1000	6000 x 1500	6000 x 2000