SilverThin Bearings

National Precision Bearing stocks the broadest range of thin section bearings of any distributor in North America. From miniature precision thin section bearings with OD’s smaller than 5/8” to slewing ring bearings with bore sizes above 40” National Precision’s inventory creates solutions in Medical, Aerospace, Defense, Precision Industrial and Commercial applications.

Thin section bearings are often specified where low torque is required and weight and/or space are limited. In applications with these limitations, special lubricants and requirements for extreme cleanliness are common. As an AS9100 certified supplier, National Precision Bearing’s focus is always on quality and continuous improvement. National Precision Bearing specializes in supporting demanding applications with fast and reliable solutions.

Relubrication services available with hundreds of specialty lubricants in stock.

Applications served by National Precision Bearing's Thin Section Specialists:

  • Medical Equipment
  • Rotary polishing equipment
  • X-ray – MRI
  • Rotary pipe cutting equipment
  • Rotary welding equipment
  • Semi-conductor equipment Rotary actuators
  • Rotary work holding tables
  • Aerospace - auxiliary equipment
  • Turrets
  • Gun turrets
  • Turntables
  • Gun Barrel Mounts
  • Indexing tables
  • Missile launchers
  • Machine tools
  • Lathe accessories
  • Radar equipment
  • Robotics
  • Radar drives
  • Antenna pedestals
  • Packaging equipment
  • Satellite antennas
  • Pedestals Labeling machines
  • Truck mounted communication equipment
  • Food processing equipment
  • Bottling equipment
  • Optical equipment
  • Converting equipment
  • Telescope bases
  • Wallpaper
  • Screen printing
  • Camera mounts
  • Textile
  • Knitting machinery
  • Optical drivers
  • Tire production equipment
  • Security camera mounts
  • Wire handling, winding, bonding equipment
  • Sensors
  • Oil well equipment
  • Mounts for Sensors
  • Blow out protectors
  • Instrument mounts
  • King post bearing applications
  • Gimbals
  • Gimbal assemblies
  • Gear boxes
  • Slip rings Transmission gear and chain
  • Rotary unions
  • Rotary joints Clutch backstops
Races (rings) .................................
AISI 52100 vacuum degassed bearing steel Please check with factory for operating temperatures for sealed bearings
Heat treatment .................................
Through hardened and stabilized for use at -65 degrees F to +250 degrees F.
Balls .................................
AISI 52100, 440C or ceramic (Silicone Nitride)
Seals .................................
Buna-N rubber-metal reinforced
Separators .................................
"A" type - circular pocket G, H, R, U, & F "C" & "X" type - snapover type D, N, P, L, T, F & Z
Diametral Clearance .................................
ABMA standard 26.2
Preloads .................................
ABMA standard 26.2
Internal geometry .................................
ABMA standard 26.2
Identification .................................
All Silverthin™ bearings are marked with part number, lot code and "Silver" on the outside diameter (Other markings may apply)
Cleaning .................................
Immersion and agitation with preservative oil applied.
Packaging .................................
Sealed in plastic and boxed up to 12" bore. Boxing or special packaging as required.
Quality .................................
Operating Groups of Mechatronics Inc. including Silverthin™ Bearing Group, are registered to the ISO 9001:2008 quality standard. A copy of the registration certificate is available upon request.
Lubrication .................................
Sealed bearings 20% - 30% fill of Mil-G-81322 grease Open bearings are dipped in light oil as a corrosion inhibitor (not intended to be a bearing lubricant)
Type A Angular Contact Bearings

A-Type Angular Contact Bearings

LOAD CONDITION
Radial Axial Moment Reversing
Axial
Combined
Radial-Thrust
Good Excellent Use in Pairs
Excellent
Use in Pairs
Excellent
Good

In applications with axial loads in one direction the A-Type, angular contact ball bearing should be used. This bearing also works well in radial or combined radial-thrust applications. The A-Type bearing should never be used alone to support moment loads or reversing axial loading.

Two A-Type bearings are often used as a duplex pair. Different configurations for duplex bearings are shown in the Engineering section of this catalog.

Please consult SilverThin engineering for application of these bearings.


Type C Radial Contact Bearings

C-Type Radial Contact Bearings

LOAD CONDITION
Radial Axial Moment Reversing
Axial
Combined
Radial-Thrust
Excellent Good Good
Light to
moderate loads
Good
Light to
moderate loads
Good

The C-Type, radial contact ball bearing is designed with deep ball grooves to withstand high loads. Although this bearing is used primarily in applications with radial loads, it can withstand moderate axial loads, reversing axial loads, and moment loads.

Please contact Silverthin for radial bearing use with combined radial loads with axial or moment loading and for limiting speeds and separator selection.


Type X Four-Point Contact Bearings

X-Type 4-Point Contact Bearings

LOAD CONDITION
Radial Axial Moment Reversing
Axial
Combined
Radial-Thrust
Poor Good Excellent Excellent Poor

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.

Kaydon Prefix Silverthin Prefix Dimensions Type
KAA SAA 3/16" x 3/16" A,C,X
JHA JSHA 1/4" x 3/16" C,X
JA JSA 1/4" x1/4" C,X
KA SA 1/4" x 1/4" A,C,X
JB JSB 5/16" x 5/16" C,X
KB SB 5/16" x 5/16" A,C,X
KC SC 3/8" x 3/8" A,C,X
JU JSU 1/2" x 3/8" C,X
KD SD 1/2" x 1/2" A,C,X
KF SF 3/4" x 3/4" A,C,X
KG SG 1" x 1" A,C,X

Thin Section Standard Stock Sizes, Many Special Sizes and Configurations Available on Request

Bore size in inches SAA SA *JSA SB *JSB SC *JSU SD SF SG
A C X A C X C X A C X C X A C X C X A C X A C X A C X
1.00                                                
1.50                                                
1.75                                                
2.00                                      
2.50                                      
3.00                                  
3.50                                  
3.70                                                      
4.00              
4.20                          
4.50                    
4.70                                
5.00                
5.50            
6.00              
6.50                  
7.00                      
7.50                        
8.00                    
9.00                      
10.00                          
11.00                          
12.00                        
14.00                                
16.00                                    
18.00                                                
20.00                                                
25.00                                                  
30.00                                                  
35.00                                                  

Contact the Thin Section Bearings Product Group

For additional information, go to www.silverthin.com