Thin Section 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.

Thin Section Bearing Applications

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

Thin Section Bearing Specifications

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)

Thin Section Bearings Selection Guide

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.

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.

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.

Thin Section Bearings Part Interchange/Dimension/Type

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

SilverThin Product Lines at a Glance

Bore size in inches	SAA			SA			*JSA		SB			*JSB		SC			*JSU		SD			SF			SG
Bore size in inches	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																										•	•

SilverThin Bearing Part Numbering

Contact the Thin Section Bearings Product Group

For additional information, go to www.silverthin.com