UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite crossbeam with embedded steel sleeves in China. With abundant experience, we warmly welcome you to buy advanced granite crossbeam with embedded steel sleeves made in China here from our factory. We also accept custom orders.
Product Overview
The granite crossbeam with embedded steel sleeves is UNPARALLELED's composite ultra-precision structural part. It combines high stability and excellent vibration damping of black granite with local high strength of steel sleeves, solving the problem of thread hole cracking and damage caused by repeated assembly on pure granite.
Made of exclusive black granite with density of 3100kg/m³, the raw material is stress-relieved through aging treatment. It features good thermal stability, non-magnetism and rust resistance. Alloy steel sleeves are pre-embedded at mounting holes and tightly bonded with granite under constant temperature, improving locking strength and re-assembly precision of mounting positions.
Fine lapping is finished in a constant-temperature dust-free workshop. Flatness and straightness reach micron level. All products are inspected with full-set precision traceable measuring instruments. Compared with cast iron crossbeams, it maintains stable benchmark and fast vibration attenuation, greatly reducing later calibration frequency.
It is widely used in semiconductor inspection, laser machining, CMM, linear motor platforms and new energy precision inspection equipment. Custom sizes are available.
| Material | UNPARALLELED® black granite |
| Accuracy | Accuracy up to 1 μm and better |
| Density | 3100 kg/m³ |
| Metrology traceability | Measuring instruments traceable, compliant with DIN, ASME, GB. |
| Production environment | Constant-temperature, humidity-controlled, shockproof & dust-free workshop |
Quality Control
Core Advantages
Composite structure to overcome pure granite weaknesses Pre-embedded high-strength alloy steel sleeves prevent thread hole chipping and damage caused by repeated disassembly. Steel sleeves distribute bolt tightening stress, enable multiple re-assemblies and greatly improve local load capacity.
Stable substrate, low thermal deformation & excellent vibration damping Made of exclusive black granite (density: 3100 kg/m³) with linear thermal expansion coefficient ≤3e-6/℃. High internal damping absorbs vibration rapidly. It is non-magnetic and rust-free. Raw blocks undergo long natural aging for stress relief, maintaining stable benchmark and reducing equipment calibration frequency.
High-precision machining under constant temperature for stable geometry Monolithic machining and lapping are finished in constant-temperature, humidity-controlled dust-free workshop. Straightness and flatness reach micron level. Pre-embedded sleeves are finely lapped to achieve seamless bonding with granite and accurate positioning, minimizing assembly stress.
Superior long-term precision retention vs cast iron crossbeams Free from casting residual stress and time-dependent creep deformation. No rust or magnetic interference, ideal for high-cleanliness precision applications such as semiconductor, optics and laser equipment.
Full-process quality control & custom service All measuring instruments are traceable to standards, complying with DIN, ASME and GB. ISO, CE and CNAS certified. Custom dimensions, hole layouts and sleeve specifications are available. Max machining length up to 20m; hollow lightweight structure optional.
Services
Product Main Application Fields
Semiconductor inspection equipment
Precision PCB inspection & processing equipment
Femtosecond / picosecond laser processing platforms
Coordinate Measuring Machines (CMM)
2D optical measuring instruments
X-Ray and industrial CT inspection equipment
Precision inspection platforms for new energy lithium batteries
Perovskite coating equipment
High-precision linear motor motion platforms
Frequently Asked Question
Q: Will the embedded steel sleeves fall off over time? A: Adopting constant-temperature pre-embedded integrated process, steel sleeves bond seamlessly with granite. After curing and precision lapping, stress transfers evenly. Full inspection before delivery. No loosening or detachment under normal working conditions.
Q: Is it much more expensive than cast iron crossbeam? A: Unit price is higher than cast iron. However, it maintains stable benchmark for years and cuts the cost of downtime, calibration and rework. Lower total cost over the full lifecycle, ideal for high-precision equipment.
Q: What is the maximum length? Can weight be reduced? A: Max machining length up to 20 m. Hollow lightweight structure is optional to reduce weight while retaining rigidity and lowering equipment load.
Q: Can steel sleeves and hole layout be customized per our drawings? A: Yes. Sleeve position, hole diameter, depth and thread specifications can be customized according to customer drawings to meet different mounting and locking requirements.
Q: What accuracy can you achieve? Can you supply inspection reports? A: Geometric accuracy up to 1 μm and better. Tested with Renishaw interferometer, WYLER electronic level and Mahr dial gauge. Traceable inspection reports are available, complying with DIN, ASME and GB standards.
Q: What maintenance is required? A: Granite is rust-proof and corrosion resistant. Clean with soft cloth. Avoid heavy impact from hard objects and abrasive cleaners on reference surfaces.
Q: What is the lead time? Do you accept small orders? A: Lead time depends on dimension and complexity. Both small-batch samples and mass production orders are accepted.
Certificate
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