Hole Jewel contains a series of components that are chiefly applied as supporting bearings to the rotational systems of various

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: Plane straight/olive holed bearing, single-cup plane straight/olive holed bearing, double-cups plane straight/olive holed bearing, raised olive holed bearing, and single-cup raised olive holed bearing, etc.

Main Types

Specification and Technical Index

 

Item	Outside Diameter	Height	Inner diameter	Radian of Inner hole	Cup/ Raised curvature radius
Size range	Φ0.80 ~ Φ30.00	0.10 ~ 115.00	Φ0.05 ~ Φ20.00	>2H	>0.45
Utmost limit tolerance	0.004 ~ 0.05	+/-0.01	0.004 ~ 0.06		>+/-0.03
Surface roughness: the surface for application: Rz0.05~ Rz0.2    Assemble and sink surfaces: Rz3.2

Material

Synthetic sapphire/ruby single crystal α-Al2O3, natural agate, spinel, ceramic, etc.

sapphire hole jewels