TAOMSUN Sapphire & Ruby Through-Hole Jewel Bearings – Plain, Arc, Single/Double Oil-Groove, Convex Types | Ø0.08–Ø5.00 mm Bore, 0.004 mm Tolerance

🔍 Key Features: Synthetic ruby / sapphire single crystal — high hardness and wear resistance; Bore diameter Ø0.08–Ø5.00 mm — micro-hole capability down to 0.004 mm tolerance; Outer diameter Ø0.80–Ø8.00 mm — h7–h9 precision; Oil-groove and convex-top curvature machined to ±0.03 / ±0.05 mm; Bearing surface roughness R0.1 / R0.2, mounting surface R2.3; Full custom shapes available to drawing.

✓ Recommended: Provide instrument type, rotational speed, and load for selection support. Oil-groove type can be matched to assembly method and lubrication requirement. Small-batch trial production is available for new instrument development.

✗ Avoid: Excessive press-fit force during assembly; misalignment between bore and shaft; dry running without lubrication in high-speed applications.

✗ Handling Precaution: Jewel bearings are hard but brittle — avoid impact, dropping, or point-loading on the bore edge. Store in original packaging before assembly.

💡 Tip: For ultra-small bores (Ø0.08–Ø0.20 mm), please share the length-to-diameter ratio so we can evaluate process feasibility before quoting.

Q: What is the smallest bore you can machine?
A: Our minimum bore diameter is Ø0.08 mm, with tolerance down to 0.004 mm, suitable for ultra-precision instruments. Feasibility is evaluated based on the length-to-diameter ratio.

Q: Does inconsistent oil-groove depth affect performance?
A: Yes. Too shallow means insufficient oil retention; too deep weakens structural strength. We control oil-groove depth within ±0.02–0.05 mm to ensure stable lubrication.

Q: Can you help with selection?
A: Yes. Please provide your application details — instrument type, rotational speed, load, etc. — and we will recommend the most suitable structure and oil-groove design.

Q: What is the difference between ruby and sapphire bearings?
A: Both are synthetic single crystals with similar hardness and wear resistance. Ruby is chromium-doped (red), sapphire is undoped (clear). Selection depends on application, cost, and customer preference.

Q: Do you support small-batch trial orders?
A: Yes. For new instrument development, we can arrange small-batch trial production. Please share your drawing and target quantity.

Q: How do you ensure batch consistency?
A: We follow every order through production, in-process spot-check, and pre-shipment re-verification. Key dimensions and surface finish are inspected before packing.

Suzhou Taomsun (TAOMSUN) is a professional supplier of precision components, analytical-instrument parts, and life-science consumables, with long-standing industry experience. Our product portfolio covers ruby and sapphire jewel bearings, precision ceramic components, optical gratings, machined metal parts, laboratory consumables, and analytical instruments. We serve customers in life sciences, analytical instrumentation, chemical analysis, and materials science. 🌏 Overseas sales and technical support is provided by METICULAB™ (Korea).