Black Granite Optical Table | Precision Breadboard – ZHHIMG

Q: How is a granite optical table different from a standard steel breadboard? Steel breadboards are magnetic, conduct heat and vibration readily, and can warp slightly over years of use. Granite is inert, non-magnetic, and dimensionally stable across a much wider temperature range — which is why most high-precision metrology and laser labs eventually migrate to granite bases.

Q: Is your granite the same as the marble often marketed as "granite bases"? No — and this distinction matters more than most buyers realize. ZHHIMG uses genuine high-density black granite (≈3,100 kg/m³), which outperforms lower-density marble substitutes in both stiffness and long-term stability. We test and disclose density specifically because some suppliers substitute cheaper marble under a "granite" label.

Q: Can the table be customized to my equipment's footprint? Yes. Hole pattern, overall dimensions (up to 20 m long, 4 m wide, 1 m thick per single piece), load rating, and surface flatness grade can all be configured to match your specific laser, CMM, or inspection system.

Q: What flatness tolerance can I expect? Flatness grade depends on the intended application — surface plates used as measurement references can reach nanometer-level flatness, while general assembly/mounting tables are typically specified at micron-level tolerances. We'll recommend the right grade once we know your use case.

Q: Do you provide calibration documentation? Yes. Every table is measured using instruments with calibration certificates traceable to recognized metrology institutes, and a nameplate/inspection tag ships with each unit for full quality traceability.

Q: What's the typical lead time for a custom order? Lead time depends on size and finishing grade. Because we operate four dedicated granite-machining production lines with a monthly capacity of roughly 20,000 sets, most standard and semi-custom orders can be scheduled significantly faster than smaller workshops can manage.