UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite straight edge for machine calibration in China. With abundant experience, we warmly welcome you to buy advanced granite straight edge for machine calibration made in China here from our factory. We also accept custom orders.
Product Overview
Our Granite Straight Edge for Machine Calibration is a high-precision measuring instrument crafted from premium Jinan Black Granite (also known as Taishan Black Granite). Engineered with two or four precision-lapped surfaces, this straight edge is ideal for flatness inspection, machine alignment, and calibration tasks in metrology labs, CNC workshops, and laser cutting systems.
Available in lengths from 400mm to 4000mm, our Granite Straight Edge for Machine Calibration offer exceptional straightness, hardness, and dimensional stability, making them a superior choice over traditional steel or cast iron counterparts.
Product Specifications
|
Specification Model (Four precision surfaces) |
Straightness& Flatness of working surface |
Parallelism between working surfaces |
Squareness between working surface and side surface |
|||
|
Precision Grade(μm) |
||||||
|
00 |
0 |
00 |
0 |
00 |
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 |
5 |
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 |
8.1 |
13.5 |
27 |
45 |
|
... |
... |
... |
... |
... |
... |
... |
Applications
Machine tool alignment and rail inspection
Flatness and straightness calibration in metrology labs
LASER system base alignment
CNC machine setup and part validation
Why Choose Our Granite Straight Edge?
| Feature | Ours | Other Suppliers |
|---|---|---|
| Material Origin | Select-grade Jinan Black Granite | Mixed local granite or unverified source |
| Surface Finish | Hand-scraped & lapped to mirror smoothness | Rough machined or mechanically polished |
| Straightness Accuracy | Up to 0.001mm over full length | 0.005–0.01mm typical |
| Inspection Report | Provided with every unit | Optional or unavailable |
| Customization | Available for length, inserts, engraving | Limited |
| Delivery Lead Time | 7–15 days depending on size | Often over 20 days |
We control every process in-house, from material cutting to precision lapping and final inspection using imported coordinate measuring machines (CMMs). Each straight edge is delivered with a quality inspection certificate to ensure traceability.
Factory Showcase
Key Features:
✅ Material Excellence: Made from high-density black granite (density: 3070 kg/m³), naturally aged over millions of years, providing long-term stability and zero internal stress.
✅ High Accuracy: Surface straightness tolerance up to 0.001mm, meeting DIN, GB, and ASME standards.
✅ Thermal Stability: Lower coefficient of thermal expansion compared to steel, ensuring accuracy even in fluctuating temperatures.
✅ Non-magnetic & Rust-Free: Ideal for sensitive environments where steel tools may interfere with measurements or corrode.
✅ Wear-Resistant: Hardness up to 7 Mohs, comparable to hardened steel, ensuring long service life.
Quality Control
International Certification and Service System
transportation
- Packaging: Shockproof plywood case with protective foam
- Delivery: By sea, air, or express (FedEx/DHL/UPS available)
- Lead Time: 7–15 days for standard models, custom models negotiable
FAQ
Q: What is a granite straight edge?
A straight edge is a tool used for drawing straight lines or verifying the straightness of a surface. A granite straight edge is specifically made from granite, known for its stability and flatness.
Q: What are the advantages of using granite?
Granite offers several advantages over other materials for straight edges, including high flatness accuracy, resistance to wear and corrosion, low thermal expansion, and dimensional stability.
Q: What are the different types of granite straight edges?
Granite straight edges are available in various sizes, lengths, and accuracy grades (e.g., AA, A). Some may have beveled edges, while others are designed for specific applications.
Q: What are granite straight edges used for?
They are used in manufacturing, machining, and metrology to ensure the flatness and straightness of surfaces, such as machine tool tables, reference surfaces, and inspection gauges.
Contact Us for a Quote
Looking for a long-lasting and highly accurate granite straight edge for machine calibration? Send us your drawing or required dimensions, and our team will provide a prompt quotation with 3D design support and international shipping options.
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