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GRANITE SURFACE PLATE

Buy precision granite surface plates for inspection and calibration. Available in various Grade Reliable supplier with on-time delivery in South India.

Granite Surface Plates

Granite surface plates are crucial for precision measurement and inspection. Known for their strength, they provide a flat surface for accurate measurements. Their non-porous nature ensures durability and easy maintenance, making them ideal for machines and labs. Whether for quality control or machining, they are a reliable choice for high precision.

Granite surface plates have specific technical standards to ensure accuracy and reliability in engineering metrology applications.
Key Standards: IS 7327 (2003) is an Indian Standard that outlines the specifications for granite surface plates, identical to ISO 8512-2:1990.

Technical Specifications

Material Properties

  • Composition: Natural granite (usually black, red, or grey) with high quartz content, providing excellent hardness and wear resistance.
  • Density: 2.6–2.8 g/cm³ — lighter than cast iron but still stable.
  • Thermal Stability: Very low coefficient of thermal expansion (~4–5 × 10⁻⁶ /°C), meaning minimal dimensional change with temperature variations.
  • Corrosion Resistance: Naturally rust-proof, eliminating the need for oiling or anti-corrosion treatments.
  • Vibration Damping: Excellent natural damping due to crystalline structure, ideal for precision measurements in vibration-prone environments.

Industrial Applications

  • Metrology labs requiring ISO 9001 or NABL certified calibration
  • Aerospace and automotive inspection stations
  • Research and development labs
  • Quality assurance in electronics and precision tool industries

Maintenance & Longevity

  • Granite Surface Plates: Minimal maintenance required; periodic cleaning and proper storage is enough. Resistant to rust, scratches, and thermal changes. Can maintain flatness for decades with normal use.

For modern calibration and inspection needs, granite surface plates are the preferred standard due to:

  • High flatness and long-term stability

  • Excellent wear and corrosion resistance

  • Low thermal expansion and vibration damping

Granite Surface Plates – Standard Sizes

and Flatness Accuracies

    
   
Sizes in mm (L x W x T)
Grade 0 (µm)
Grade 1 (µm)
Grade 2 (µm)
Sizes in mm
(L x W x T)
Grade 0 (µm)
Grade 1 (µm)
Grade 2 (µm)
250 x 250
3.5
7
15
750 x 750
5.5
11
22
400 x 250
4.5
9
18
1200 x 800
7
14
28
400 x 400
4.5
9
17
1200 x 900
7
14
28
450 x 450
5
10
20
1200 x 1000
7.5
15
30
630 x 400
5
10
20
1500 x 1000
9
18
36
630 x 630
6
12
21
1500 x 1500
9
18
36
1000 x 630
7
14
24
2000 x 1500
11.5
23
46
1000 x 1000
8
16
28
3000 x 1000
12
25
50
1600 x 1000
7
14
26
3000 x 1500
12.5
26
52
1600 x 1000
8
16
30
3000 x 2000
13
26
52
2000 x 1000
9
19
38
4000 x 1000
14.5
29
58
2000 x 1200
9.5
20
38
4000 x 1500
15
30
60
2000 x 1600
10.5
21
40
4000 x 2000
15.5
31
62
2500 x 1600
11.5
23
42
4000 x 2500
16
32
64
2500 x 2000
12
24
48