miniature bearings | small bearings | fishing reel bearings

Stainless steel miniature bearings for shaft sizes from 0.04" to 1.00"
See product table below for dimensions and technical drawings
See Products Variants below for chrome steel and flanged options

Stainless steel miniature bearings are sometimes referred to as instrument bearings or micro bearings and are used in applications as varied as clocks, wind speed measuring instruments, medical instruments, fishing reels, scanners, encoders and small drones. Stainless steel miniature bearings are also available with a flange on the outer ring. See Products Variants below for more details.

Many small, instrument bearings are only made from 440 grade stainless steel as instrument applications are not usually high load. EZO stainless steel instrument bearings are made from KS440 stainless steel, also known as ACD34 or X65Cr13. This grade of stainless steel has a greater load capacity than AISI-440C grade and better low noise qualities. It is also has better corrosion resistance.

Stainless steel bearings, with a stainless steel retainer and a suitable high temperature lubricant, can be used at temperatures of 250°C constant or up to 300°C intermittent. Above these temperatures, the load capacity of stainless steel is reduced so we recommend full ceramic bearings for use over 300°C.

Our inch sized stainless steel bearings are suitable for use in mildly corrosive environments as the steel is corrosion resistant but it is affected by seawater and stronger acids or alkalis. Our marine grade stainless steel bearings, plastic bearings or full ceramic bearings should be used in very corrosive environments. Stainless steel bearings do not need preservative oil on the exterior surfaces so they can be used without lubrication (dry).

Most of our imperial stainless steel miniature bearings can be supplied open or with AISI-304 stainless steel shields. The smallest sizes are only available open. The larger sizes may be available with rubber or Teflon contact seals or low friction non-contact rubber seals. The open miniature bearings are normally oil lubricated. Shielded or sealed bearings are generally pre-lubricated with grease but shielded bearings can also be supplied with instrument oil for low torque applications or completely dry for very low speed applications where very low rotational resistance is required. Thanks to our in-house lubrication facility, our stainless steel miniature bearings can be relubricated according to customer requirements.

The standard cage or retainer for a stainless steel miniature bearing is made from either AISI-304 or AISI-420 stainless steel. A one-piece crown cage is more common for the very small and the very thin section bearings due to space constraints. Larger sizes have a two piece ribbon cage. For higher speeds, some sizes can be supplied with a reinforced “TW” nylon crown cage although this reduces the maximum operating temperature to 120°C.

Click on INFO in the rows below to display technical drawings of the bearings with load and speed data. The load ratings shown are for AISI-440C stainless steel bearings. Load ratings are higher for EZO KS440 bearings. Please note that the maximum loads and speeds are used in theoretical life calculations. It is recommended to use bearings at significantly less than the maximum load and speed ratings to ensure reasonable bearing life.

Products Variants
Miniature Bearings Inch | miniature ball bearings

Miniature Bearings - Inch

Chrome

More Information

flanged bearing | miniature bearings | imperial bearings

Miniature flanged bearings - inch

Chrome Flanged

More Information

Miniature bearings

Stainless Steel Flanged Miniature Bearings - Inch

Stainless Flanged

More Information

Product Details Stainless

BORE

(inch)

O.D.

(inch)

OPEN BEARING

SHIELDED BEARING

SEALED BEARING

WIDTH

(inch)

SMB REFERENCE

MORE INFO

WIDTH

(inch)

SMB REFERENCE

MORE INFO

WIDTH

(inch)

SMB REFERENCE

MORE INFO

0.04

0.125

0.0469

SR09

info

 

 

 

 

 

 

0.0469 0.1562 0.0625 SR0 info 0.0937 SR0ZZ info      
0.055 0.1875 0.0781 SR1 info 0.1094 SR1ZZ info      
0.0781 0.25 0.0937 SR1-4 info 0.1406 SR1-4ZZ info      
0.0937 0.1875 0.0625 SR133 info 0.0937 SR133ZZ info      
0.3125 0.1094 SR1-5 info 0.1406 SR1-5ZZ info      

0.125

0.25

0.0937

SR144

info

0.1094

SR144ZZ

info

0.1094

SR144-TTS

info

0.25       0.0937 SR144ZZW09 info      

0.3125

0.1094

SR2-5

info

0.1406

SR2-5ZZ

info

0.1406

SR2-5-TTS

info

0.3125       0.1094 SR2-5ZZW10 info      

0.375

0.1094

SR2-6

info

0.1406

SR2-6ZZ

info

0.1406

SR2-6-TTS

info

0.375

 

 

 

0.1094

SR2-6ZZW10

info

 

 

 

0.375 0.1562 SR2 info 0.1562 SR2ZZ info 0.1562 SR2-2RS info

0.5

0.1094

SR184

info

0.1094

SR184ZZ

info

 

 

 

0.5 0.1719 SR2A info 0.1719 SR2AZZ info 0.1719 SR2A-2RS info

0.1562

0.3125

0.1094

SR155

info

0.125

SR155ZZ

info

0.125

SR155-TTS

info

0.1875

0.3125

0.1094

SR156

info

0.125

SR156ZZ

info

0.125

SR156-TTS

info

0.375

0.125

SR166

info

0.125

SR166ZZ

info

0.125

SR166-TTS

info

0.5

0.1562

SR3

info

0.196

SR3ZZ

info

0.196

SR3-2RS

info

0.5

 

 

 

0.1562

SR3ZZW15

info

0.1562

SR3-2RSW15

info

0.25

0.375

0.125

SR168

info

0.125

SR168ZZ

info

0.125

SR168-TTS

info

0.5

0.125

SR188

info

0.1875

SR188ZZ

info

0.1875

SR188-TTS

info

0.5

 

 

 

0.125

SR188ZW12

info

 

 

 

0.625

0.196

SR4

info

0.196

SR4ZZ

info

0.196

SR4-2RS

info

0.75

0.2188

SR4A

info

0.2812

SR4AZZ

info

0.2812

SR4A-2RS

info

0.3125

0.5

0.1562

SR1810

info

0.1562

SR1810ZZ

info

0.1562

SR1810-TTS

info

0.375

0.625

0.1562

SR1038

info

0.1562

SR1038ZZ

info

0.1562

SR1038-TTS

info

0.875

0.2188

SR6

info

0.2812

SR6ZZ

info

0.2812

SR6-2RS

info

0.5

 

0.75

0.1562

SR1212

info

0.1562

SR1212ZZ

info

0.1562

SR1212-TTS

info

0.75       0.196 SR1212ZZTPW19 info      
0.875 0.2188 SR6-1/2 info 0.2812 SR6ZZ-1/2 info      
1.125 0.25 SR8 info 0.3125 SR8ZZ info 0.3125 SR8-2RS info

0.625

0.875

0.1562

SR1458

info

0.1562

SR1458ZZ

info

0.1562

SR1458-TTS

info

1.375

0.2812

SR10

info

0.3438

SR10ZZ

info

0.3438

SR10-2RS

info

0.75

1.0

0.1562

SR1634

info

0.1562

SR1634ZZ

info

0.1562

SR1634-TTS

info

1.625

0.3125

SR12

info

0.4375

SR12ZZ

info

0.4375

SR12-2RS

info

0.875

1.875

0.375

SR14

info

0.50

SR14ZZ

info

0.50

SR14-2RS

info

1.0

2.0

0.375

SR16

info

0.50

SR16ZZ

info

0.50

SR16-2RS

info

Our determination to remain specialised gives us a high level of product knowledge, providing bearing and lubrication solutions to existing or potential customers, whether individuals or large corporations. We don’t just sell bearings, we help to solve your problems. - Chris Johnson, managing director of SMB Bearings.