UNPARALLELED LTD is one of the leading manufacturers and suppliers of linear guide assembly in China. With abundant experience, we warmly welcome you to buy advanced linear guide assembly made in China here from our factory. We also accept custom orders.
When building high-speed semiconductor positioning stages or optical inspection gantries, your motion control is only as reliable as the reference plane it glides upon. Microscopic mechanical deviations translate directly into focal blur, sensor lag, and calibration errors.
The UNPARALLELED® Ultra-Precision Granite Air Bearing Base combines the geological stability of our exclusive high-density black granite with custom-engineered linear guide tracks. Designed for frictionless motion, this monolithic assembly serves as the structural foundation for the world's most demanding cleanroom applications. By removing the mechanical hysteresis, lubrication dependencies, and bearing wear of traditional steel guides, we provide a lifetime reference standard that holds its nanometer-level tolerances under continuous, high-acceleration cycles.
Why UNPARALLELED® Natural Black Granite?
Not all stone is created equal. While many regional manufacturers rely on softer, cheaper gray marbles that warp under environmental shifts, we hold a uncompromising stance against material substitution.
Every base is quarried from our select UNPARALLELED® Black Granite reserves. Boasting an ultra-high density of approximately 3100 kg/m³, this material contains a dense, interlocking crystalline structure rich in quartz. It delivers a incredibly low Coefficient of Thermal Expansion (CTE), up to ten times the vibration damping of structural steel, and complete immunity to rust and chemical corrosion. It is quite literally aged by the Earth for millions of years to guarantee zero residual internal stress.
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Technical Specifications & Standards
We are the industry's sole manufacturer holding ISO 9001, ISO 45001, ISO 14001, and CE certifications concurrently. Every assembly is processed in our 10,000 m² climate-controlled facility (20℃ ± 0.1℃) built over a 1000 mm thick military-grade anti-vibration foundation to ensure that our measurements remain completely isolated from environmental noise.
| Technical Parameter | Specification Value | Standard Compliance |
| Material Type | Genuine UNPARALLELED® Black Granite | Density: ≈ 3100 kg/m³ |
| Flatness Tolerance | Sub-micron / Nanometer-level (Up to Grade 000) | DIN 876 / ASME GGG-P-463C |
| Straightness of Guide Rail | < 1.0μm over 1000 mm | Metrology verified via Renishaw Laser |
| Surface Roughness (Ra) | ≤ 0.1μm (Mirror finish) | Mitutoyo Digital Roughness Profile |
| Threaded Inserts | Stainless steel / Invar-grade inserts | Epoxied post-production to prevent stress |
| Maximum Component Weight | Up to 100 Tons (Single piece block) | Fully integrated overhead crane capacity |
| Maximum Single Dimensions | 20m × 4m×1m (Customizable) | Machined on world-class grinding centers |
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Core Performance Advantages
- Integrated Stepped Air-Bearing Track: The precision-ground lateral shoulder allows air-bearing pucks to reference both the horizontal and vertical planes simultaneously. This ensures flawless pitch, roll, and yaw control for moving carriages.
- Frictionless, Wear-Free Lifespan: Because air bearings float on a thin, pressurized air film (5 - 10μm), there is zero physical contact. The structural accuracy of the granite guide remains identical on day 10,000 as it did on day one.
- State-of-the-Art Metrology Verification: We do not guess precision-we prove it. Using Swiss-made WYLER differential electronic levels (0.5um) and Renishaw laser interferometers, we map every micrometer of flatness. Every assembly ships with a calibration certificate traceable to National Metrology Institutes.
- Cleanroom & Vacuum Compatible: Free of mechanical lubricants, grease, and outgassing polymers, this granite base is ready for direct integration into ISO Class 1 semiconductor lithography and wafer fab environments.
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Typical Industrial Applications
- Semiconductor Lithography & Wafer Inspection (AOI/X-Ray)
- Coordinate Measuring Machines (CMM) & Metrology Stations
- Femtosecond & Picosecond Laser Micro-machining Beds
- Linear Motor Multi-Axis XY Positioning Gantry Stages
- Perovskite Solar Cell Coaters & Lithium Battery Inspection Gear
FAQ
Why is black granite preferred over synthetic mineral castings for air bearing guides?
While mineral castings (epoxy granite) offer outstanding vibration damping for structural CNC machine beds, they contain polymer binders that can chemically age, creep, or outgas under vacuum. For absolute reference planes holding sub-micron tolerances, natural black granite remains geographically superior because it has zero internal structural stress and does not shift over decades of use.
How do you ensure the threaded metal inserts do not warp the granite over time?
Traditional mechanical expansion anchors introduce immense localized stress, which distorts the surrounding flat surface. We drill precise oversized pockets and secure our stainless steel or low-expansion Invar inserts using proprietary, low-shrinkage epoxy resins inside our cleanroom. This isolates the granite from mounting stress.
Can we customize the mounting hole patterns and overall dimensions?
Yes. We operate custom CNC grinding and machining centers capable of handling single blocks up to 20 m long. We execute custom hole patterns, T-slots, vacuum grooves, and secondary guide rails directly to your CAD drawing.
Request a Technical Quote (RFQ Guide)
- To help our engineering team provide you with an accurate, rapid quote, please prepare the following details for your inquiry:
CAD Drawings: Preferred formats are .STEP, .IGS, or .PDF showing critical dimensions and tolerances.
Target Precision: Specify the required flatness grade (e.g., DIN 876 Grade 00) and rail straightness requirements.
Insert Requirements: Thread size, depth, and target pull-out force if applicable.
Application Environment: Operating temperature, humidity constraints, cleanroom class, or vacuum levels.
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