Ball Bearings from National Precision Bearing, Inc.

Silverthin Bearing SA Series - Type X

Silverthin Bearing SA Series - Type X -- View Larger Image
Silverthin Bearing SA Series - Type X-Image

The X-Type, or 4-point contact, ball bearing is ideal for moment loading. X-Type bearings are designed with gothic arch raceways creating 4 contact points between the balls and the raceways. This design is excellent for moment loading and reversing axial loading. The X-Type bearing can be used for other light loading conditions, but is not recommended in place of the C- or A-Type bearing for pure radial loads.

When specifying this type of bearing for use with axial or moment loads combined with radial loads application speed (rpm) is a real concern. Please contact SilverThin engineering for information on combined load and limiting speeds.


Product Category
Ball Bearings
Primary Bearing Category
Angular Contact Ball Bearing
Four Point Contact
Aerospace (optional feature); Instrument / Miniature (optional feature); Medical / Dental (optional feature); Military (optional feature); Semiconductor
Design Units
2.0000 to 12.0000 inch (50.800 to 304.800 mm)
Outside Diameter
Outer Ring Width
Static Radial
Dynamic Axial
Dynamic Radial
Seals / Shields