Premium Granite Surface Plate
DIN 876 & ISO 8512 and ASME B89.3.1 Certified The Global Benchmark for Precision Metrology & Manufacturing
Granite Platforms
Phone：+1(912)4192388
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- Specifications
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Specifications for Marble Measuring Platforms:
SIZE INCHES
W x L xTOVERALL ACCURACY SHIP
WTLBAA A B 8 x 12 x 2" .000050” .0001” .0002” 28 9 x 12 x 3" .000050” .0001” .0002” 40 12 x 12 x 3" .000050” .0001” .0002” 42 12x 18x 3" .000050” .0001” .0002” 63 18 x 18 x 4" .000050” .0001” .0002” 108 18 x 24 x 3" .000075” .000150” .0003” 126 24 x 24 x 3" .000075” .000150” .0003” 278 24 x 36 x 4" .0001” .0002” .0004” 337 24 x 48 x 6" .000150” .0003” .0006” 674 30 x 48 x 6" .000175” .000350” .0007” 842 36 x 36 x 6" .000150” .0003” .0006” 759 36 x 48 x 6" .0002” .0004” .0008” 1011 36 x 60 x 8" .000250” .0005” .001” 1966 36 x 72 x 10" .0003” .0006” .0012” 2914 48 x 48 x 8" .0002” .0004” .0008” 2097 48 x 60 x 8" .0003” .0006” .0012” 2621 48 x 72 x 10" .000350” .0007” .0014” 3885 48 x 96 x 12" .0005” .001” .002” 5920 AA Laboratory Grade For ultra-precision operations in consistent temperature metrology departments A Inspection Grade For general use in quality control areas B Toolroom Grade For shop work and production checking Key Features & Benefits
- International Standard Compliance Certified accuracy grades 00, 0, 1, and 2 according to DIN 876 and ISO 8512. Equivalent to ASME B89.3.1 Grades AA, A, B, and C.
- Unmatched Stability Made from aged natural granite with low thermal expansion coefficient. Maintains geometric accuracy over decades of use without deformation.
- Corrosion & Rust Proof Non-metallic surface ensures zero rust risk. Resistant to coolants, oils, and acids, protecting both the plate and your workpieces.
- Non-Magnetic & Non-Conductive Ideal for measuring magnetic materials, electronic components, and sensitive instruments without interference.
- High Hardness & Wear Resistance Superior surface hardness ensures long service life even in high-frequency production environments.
Shipping & Support
- Global Shipping: Export-grade wooden crates with moisture-proof and shock-absorbing protection.
- Calibration Certificate: Every plate comes with a digital calibration report traceable to national standards.
- Warranty: Quality guarantee against manufacturing defects.
- Customization: ODM/OEM services available for special dimensions, mounting holes, or T-slots.
- International Standard Compliance Certified accuracy grades 00, 0, 1, and 2 according to DIN 876 and ISO 8512. Equivalent to ASME B89.3.1 Grades AA, A, B, and C.
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Specification
Details
Material
Natural Fine-Grain Granite (Black)
Accuracy Grades
DIN 876: 00, 0, 1, 2 <br> ASME B89.3.1: AA, A, B, C
Standard Compliance
DIN 876-1, ISO 8512, ASME B89.3.1
Surface Finish
Precision Lapped (Ra < 0.8 μm)
Sizes Available
Standard: 400x300mm to 2500x1600mm <br> Custom sizes available upon request
Thickness
Optimized for rigidity (1:3 ratio approx.)
Calibration
Included (Digital Report Traceable to National Standards)
Operating Temp
Recommended 20°C ± 2°C (68°F ± 3.6°F)
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Q: What is a granite platform?
A: A granite platform is a precision reference surface machined and hand-ground from natural rock (typically black, fine-grained granite). It serves as the “standard ruler” in metrology labs and workshops, primarily used for precision measurement, inspection, layout marking, and assembly in industrial production.
Q: Why choose granite over steel or cast iron for measuring platforms?
A: Granite offers the following unique advantages:
• Excellent stability: Its rock structure remains stable, resisting deformation over extended use.
• Rustproof and corrosion-resistant: Unaffected by coolants or oils, preventing rust contamination of workpieces.
• Non-magnetic: Suitable for measuring magnetic materials or precision electronic components.
• Thermal stability: Low thermal expansion coefficient minimizes temperature-induced shifts.
• High hardness: Excellent wear resistance ensures long-term dimensional accuracy.
• Vibration damping: Natural stone possesses inherent shock-absorbing properties.Q: Is all granite suitable for platforms?
A: No. Only high-quality natural granite with fine-grained, uniform texture, free of cracks and impurities should be selected. Common premium materials include China's “Jinan Green” and India's “Black Granite.” Coarse-grained stones or those with excessive quartz veins are prone to weathering and poor precision retention.
Q: How should the platform be supported? Can it rest directly on the ground?
A: It cannot rest directly on the ground. Specialized supports must be used.
• Three-point support: The standard support configuration is three-point, typically positioned at points 2/9 of the length from each end. This minimizes planar deformation caused by self-weight.
• Leveling: Supports usually feature adjustable feet for platform leveling.Q: Can surface scratches be repaired?
A: Yes. Minor scratches can be removed by professionals using oilstone grinding. If accuracy is compromised, the platform must be returned to the factory for regrinding and recalibration. Note that each regrinding reduces the platform's thickness.
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Tel: +1（912）419-2388
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