Ring Jewel and Endstones

Ring jewels are miniature types of annular or journal type bearings. Typical materials are synthetic sapphire and ruby with friction of .15 or less (sliding friction against steel). Because there is no detent to overcome, as is found in miniature ball races, starting torque is extremely low. Read more ...

Bombe Jewels		This configuration allows the use of a shouldered pivot in place of an endstone, therefore using the radius surface of the ring as an end thrust bearing. Any type of ring jewel may have this configuration.
Single Cup Rings		This cup may be used as an oil reservoir by setting the jewel with the cup facing away from the pivot, or the cup may be used to shorten the length of the hole.
Straight Hole Rings		The inner diameter for this bearing is straight and thus restricts the lateral movement of the shaft. Accurate alignment is required. The area contact tends to increase the friction.
Olive Hole Rings		The olive hole offers minimum contact with a pivot, resulting in minimum friction, allows for mis-alignment of the shaft.
Double Cup Rings		Same as the single cup except that there is a cup on both faces of the jewel.
Endstones		Generally used as thrust bearings in conjunction with ring jewels. Also used as wear plates.
Vee Jewels		Vee Jewels are used in highly sensitive instruments requiring low torque bearings.

Click a link below to view standard size listing for:
Standard Glass Vee Jewel Sizes
Standard Sapphire/Ruby Endstone Sizes
Standard Ruby and/or Sapphire Vee Jewel Sizes
Standard Olive Hole Ring Jewel Sizes