UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite machine base bar in China. With abundant experience, we warmly welcome you to buy advanced granite machine base bar made in China here from our factory. We also accept custom orders.
Product Overview
The component shown is a rectangular granite machine base bar, machined from solid black granite stock. Two long faces are precision-ground to a smooth, reflective finish, giving a flat, mirror-like reference surface along the bar's full length. The remaining faces retain a flame-textured or fine-grained finish, showing the natural mineral structure of the stone - a visual cue to the material's density and consistency, not just its color. The bar's edges are machined square and straight, with a clean chamfer along the top edges to prevent chipping during handling and installation. The end faces are cut perpendicular to the bar's length, which is typical of components intended for direct mounting or precise end-referencing in an assembly. Overall, the geometry is simple and deliberate: a long, rigid, low-profile bar designed to serve as a stable mechanical reference or structural base within a larger piece of equipment, rather than a decorative or architectural stone product.
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What This Product Is Used For
This style of granite machine base bar is typically specified where engineers need a rigid, dimensionally stable foundation or reference element that won't move, flex, or drift over time. Common applications include:
- Sub-bases and mounting rails for CMM and metrology instruments
- Reference bars for linear guideway and slide alignment
- Structural elements within semiconductor and inspection equipment
- Custom precision granite components machined to a customer's own assembly drawing
Because granite resists thermal expansion and dampens vibration far better than cast iron or welded steel, bars like this are frequently chosen wherever measurement accuracy or long-term positional stability is the priority - not just where a rigid bar of any material would technically fit.
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Specifications
| Attribute | Detail |
|---|---|
| Material | High-density black granite (≈3,100 kg/m³) |
| Surface finish | Precision-ground reference face(s); fine-textured side faces |
| Edge treatment | Machined square edges with protective chamfer |
| Reference standards | Manufactured with reference to standards such as DIN 876; final tolerances confirmed per customer drawing |
| Length, width, thickness | Custom, per customer specification |
| Maximum single-piece capability | Up to ≈20 m length, 4,000 mm width, 1,000 mm thickness, ≈100 tons |
| Inspection equipment | Mahr, Mitutoyo, WYLER, Renishaw, with calibration traceability |
| Certifications | ISO 9001, ISO 14001, ISO 45001, applicable CE |
Exact dimensions, flatness tolerance, and finish specification are configured per project - this bar is manufactured to order rather than sold as a fixed-size catalog item.
Key Advantages
- Dimensional stability - high-density granite resists the thermal drift that gradually throws off metal reference bars and bases
- Vibration damping - granite's crystalline structure absorbs vibration more effectively than cast iron or steel, supporting cleaner measurement and positioning results
- Single-piece large-format capability - large bars can be produced without bonded joints, avoiding the long-term stability risk that multi-piece assemblies introduce
- Verified, not assumed, tolerances - every finished part is checked with calibrated instrumentation, with traceable calibration records
- Built to your drawing - dimensions, finish, and mounting features are machined to the customer's own specification rather than forced into a standard catalog size
- Documented quality system - produced under an ISO 9001 quality management system, with applicable ISO 14001, ISO 45001, and CE certifications
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FAQ
Can this bar be manufactured in custom dimensions? Yes. Length, width, thickness, and finish are configured to your drawing. UNPARALLELED®'s large-component capability supports single-piece bars up to approximately 20 meters in length, 4,000 mm in width, and 1,000 mm in thickness.
What tolerance can be achieved on the reference face? Achievable flatness and parallelism depend on the bar's dimensions, material selection, and intended application. Send your drawing and required tolerances, and our engineering team will confirm what's achievable for your specific configuration.
How is the finished part verified before shipment? Finished components are inspected using equipment from Mahr, Mitutoyo, WYLER, and Renishaw, with calibration traceability maintained on the instruments. Inspection data can be provided with the shipment upon request.
Can mounting holes, slots, or other features be added? Yes. Bars can be machined with mounting holes, slots, pockets, or other features per your assembly drawing, in addition to the base rectangular geometry.
What lead time should I expect for a custom order? Lead time depends on dimensions, quantity, and finishing requirements. Submit your specifications for a project-specific timeline along with your quotation.
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