TAOMSUN Spherical Cup Jewel Bearing (Cup Jewels) is manufactured from synthetic ruby – Mohs hardness 9, surface roughness ≤0.01 μm, friction coefficient ≈0.14. The spherical outer diameter provides self-alignment; the curved-arc inner hole distributes stress; this dual structure ensures stable precision rotation and a long service life. Ideal for rotation support in electricity meters, water meters, tachometers, aircraft instruments, gyroscopes, clocks, flow meters and other precision instruments. Outer diameter customizable within Φ0.8–25 mm, tolerance h7~h9. ISO 9001 certified. Overseas sales and technical support provided by METICULAB (Korea).

🔍 Key feature: Spherical OD + curved-hole ID dual structure – the spherical outside diameter self-aligns to compensate for mounting-angle deviation; the smooth curved bore lowers stress concentration and extends bearing life. Designed specifically for high-precision rotary support applications.

Q: What is the difference between spherical cup jewels and plain flat bearings?
A: The spherical cup jewel features a convex spherical outside diameter with a self-aligning function that compensates for angular deviation of the mounting hole. A plain bearing has a flat outside diameter and demands higher installation accuracy. The spherical design is ideal for equipment with limited mounting space or alignment difficulties.

Q: What advantage does the curved-hole bore offer over a straight hole?
A: The curved-hole bore has a smooth, rounded edge that effectively reduces stress concentration and the risk of edge cracking, extending bearing service life. It is especially suited to high-load, high-frequency precision meter applications.

Q: What are the typical applications of spherical cup jewels?
A: They are widely used as rotary supports in electricity meters, water meters, tachometers, indicating gauges, aircraft instruments, gyroscopes, clocks, flow meters and measuring instruments.

Q: Can you manufacture non-standard sizes or special angles?
A: Yes. TAOMSUN supports full-parameter customization of outside diameter, height, groove radius, groove depth and cone angle. Please send your CAD drawing or specifications for a tailored quotation.

Q: What is the minimum order quantity?
A: For standard items, please contact our sales team for MOQ details. For custom products, the MOQ depends on specifications and complexity.

TAOMSUN is a precision component manufacturer deeply specialized in hard-material processing and bearing technology. Certified under the ISO 9001 quality management system, we focus on synthetic ruby/sapphire bearings, precision shafts and high-performance mechanical parts, serving the instrument, automation and aerospace industries. Our core team brings decades of experience from the Japanese precision-machining industry, ensuring exceptional quality and reliability in every product.