UNPARALLELED LTD is one of the leading manufacturers and suppliers of cnc machine alignment granite straight edge in China. With abundant experience, we warmly welcome you to buy advanced cnc machine alignment granite straight edge made in China here from our factory. We also accept custom orders.
Product Overview
Our CNC Machine Alignment Granite Straight Edge is a high-precision measuring and calibration tool crafted from natural black granite, specifically designed for machine tool alignment, flatness inspection, and surface calibration in precision engineering, metrology labs, CNC machining, and quality control departments.
Each granite straight edge is meticulously manufactured to ensure four precision surfaces, offering exceptional straightness, flatness, parallelism, and squareness. These features make it an essential tool for high-accuracy measurement, especially in CNC machine alignment and equipment calibration tasks.
The high-grade granite material provides excellent wear resistance, dimensional stability, corrosion resistance, and low thermal expansion, ensuring lasting accuracy and performance even in demanding workshop or laboratory environments.
Key Features:
CNC Machine Alignment Granite Straight Edge Material: High-density black granite (natural stone, non-magnetic, rust-proof)
Precision Grade: Grade 00 & Grade 0 (according to GB/T or DIN standard)
Accuracy Surfaces: Four precision surfaces
Applications: Suitable for CNC machine calibration, metrology labs, surface plate inspection, optical alignment, aerospace parts setup, etc.
Customization: Available in various lengths and specifications
Specification Table (Four Precision Surfaces)
| Model (mm) | Straightness & Flatness (μm) | Parallelism (μm) | Squareness (μm) |
|---|
| Grade 00 / Grade 0 | Grade 00 / Grade 0 | Grade 00 / Grade 0 |
| 400×60×35 | 1.6 / 2.6 | 2.4 / 3.9 | 8 / 13 |
| 630×100×50 | 2.1 / 3.5 | 3.2 / 5.3 | 10.5 / 18 |
| 1000×160×50 | 3.0 / 5.0 | 4.5 / 7.5 | 15 / 25 |
| 1600×250×80 | 4.4 / 7.4 | 6.6 / 11.1 | 22 / 37 |
| 2000×300×100 | 5.4 / 9.0 | 8.1 / 13.5 | 27 / 45 |
Custom sizes and precision grades available upon request.
Applications
CNC Guide Rail Straightness Calibration
Mold and Die Assembly Precision Alignment
Semiconductor Equipment Platform Leveling
Scientific Lab Flatness Inspection
Factory Showcase
Why Choose Our CNC Machine Alignment Granite Straight Edge?
✅ High Accuracy – Manufactured to strict tolerance levels (Grade 00 & Grade 0)
✅ Durable & Stable – Resistant to corrosion, deformation, and wear
✅ Temperature Stable – Low coefficient of thermal expansion
✅ Easy Maintenance – Does not rust or warp
✅ Trusted by Global Clients – Widely used in Singapore, Germany, the US, and more
Quality Control
International Certification and Service System
transportation
- Protective wooden box included for safe transport
- Delivery via sea, air, or express depending on quantity and destination
- Global shipping support with export documents (CO, packing list, invoice, etc.)
FAQ
Q: What is the difference between Grade A and Grade B granite?
Grade A – Inspection Grade This is typically specified for general work in quality control. Grade B – Toolroom Grade This is typically specified for production checking work throughout the shop. Overall flatness tolerance is based on unilateral measurement.
Q: What are the grades of granite inspection plates?
There are four grades of surface plates. Laboratory grade AA and A, Room Inspection Grade B, and the fourth is Workshop Grade. Grade's AA and A are the flattest with a flatness tolerances better than 0.00001 in for a Grade AA plate.
Q: How do you calibrate a granite surface plate?
If necessary, adjustments to the surface plate flatness – typically onsite re-lapping – can be done by those with the required skills and tools. The overall flatness is often checked with a laser interferometer, autocollimator, electronic levels, or master straightedge and indicator.
Q: How to clean a granite inspection table?
Avoid water-based solutions as Granite tends to absorb water. Acetone and alcohol-based cleaners will give the best results but cause a cooling effect on the plate.
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