Brown Sharpe Granite Inspection Surface Plate 24x12x3 Inch with 70-80 Shore Hardness for Precision Tool Rooms
Professional-grade granite surface plate measuring 24" x 12" x 3" (610mm x 305mm x 76mm) for precision inspection, gauging, layout, and marking applications. Ideal for tool rooms, engineering industries, and research laboratories.
- Rust-free and corrosion-resistant construction
- Warp-resistant with minimal thermal expansion
- Non-magnetic and non-glaring surface
- Extended service life with smooth operation
- Low maintenance requirements after commissioning
- Material: Close-grained granite with uniform color and texture
- Hardness: 5.6 to 7 on Moh's scale
- Specific Gravity: 3.03 g/cm³
- Shore Hardness: 70-80 Hs
- Compressive Strength: 245-254 MPa
- Linear Expansion Coefficient: 4.61×10⁻⁶/°C
- Water Absorptivity: ≤0.13%
Manufactured to GB117-2015 standard. Available upon request to DIN-876-1972, BS-817-1988, JIS-B-7513, and US Federal specification GGG-P-463-C.
Available in multiple precision grades including Grade 000, 00, 0, and 1 with flatness tolerances according to JB/T 7975-1999 standards.
| Dimensions (mm) | Weight (kg) | Grade 000 (μm) | Grade 00 (μm) | Grade 0 (μm) | Grade 1 (μm) |
|---|---|---|---|---|---|
| 300 × 200 × 50 | 17 | 1.5 | 3 | 6 | 12 |
| 300 × 300 × 50 | 19 | 1.5 | 3 | 6 | 12 |
| 400 × 300 × 70 | 25 | 1.5 | 3 | 6 | 12 |
| 400 × 400 × 70 | 48 | 2 | 3.5 | 6.5 | 13 |
| 630 × 400 × 100 | 76 | 2 | 3.5 | 7 | 14 |
| 630 × 630 × 100 | 155 | 2 | 4 | 8 | 16 |
- Rexine protective cover for working surface
- Steel stands with leveling screws
- Metallic threaded inserts and T-slots
- Plates with two or four ledges
- Granite lapping plates (square and rectangular)
Used for measuring parallel and equal altitude of precision instruments, tools, and mechanical components in modern industrial and scientific research environments.
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