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[Convex Straight Holed Jewel Bearing]

Hole Jewel contains a series of components that are chiefly applied as supporting bearings to the rotational systems of various accurate chronographs, auto-memorizing apparatus, precise instruments (micrometer, dial indicator) and other apparatus.

Main types of hole jewel: Plane straight/olive holed bearing, single-cup plane straight/olive holed bearing, double-cups plane straight/olive holed bearing, convex olive holed bearing, and single-cup convex olive holed bearing, etc.



Outside Diameter: Φ0.80 ~ Φ8.00mm, Max Deviation of Outside Diameter: h7 ~ h9

Height: 0.125 ~ 20.00mm, Max Deviation of Height: ±0.01mm

Inside Diameter: Φ0.08 ~ Φ5.00, Max Deviation of Inside Diameter: 0.004 ~ 0.02

Radius SR of Inside Diameter: (2 ~ 3)H

Curvature Radius SR1 of Cup: < Outside Diameter, Max Deviation of Curvature Radius of Cup: +/-0.03

Curvature Radius SR2 of Convex: >Outside Diameter, Max Deviation of Curvature Radius SR2 of Convex: +/-0.05        

Surface Roughness: application surfaces RZ0.1, Rz0.2, assembled surfaces: Rz3.2

Technical Index:

Material: Synthetic Sapphire/Ruby, Crude Agate, Spinelle, and ceramic, etc.


Customized. Produce according to specific requirements and drawings, and also can design products for customers.

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