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Miniature Instrument Ball Bushing Bearings

Miniature Instrument Ball Bushing Bearings

Accuracy level and compact size make the Miniature Instrument bearing ideal for small mechanisms or devices that require high repeatability and responsiveness. When replacing high friction plain bearings, Instrument bearings consistantly low coefficient of friction eliminates stick-slip and provides smooth linear performance. Each Instrument bearing can be provided with a matched 60 Case LinearRace shafting for minimum fit-up, optimizing system performance and accuracy.


Miniature Instrument Ball Bushing Specifications:

Miniature Instrument
Ball Bushing Bearing
Working Bore
Diameter (in)
60 Case
Part Number
Max Length (in)
Dynamic(1) Load
Capacity (lbf)
INST 258-SS  .1250 / .1247  LRI 2  12  7
INST 369-SS  .1875 / .1872  LRI 3  12  9
INST 4812-SS  .2500 / .2497  LRI 4  12  19
Miniature Instrument
Ball Bushing Bearing
& LinearRace Sets
Diameter (in)
Diameter (in)
 Ball Bushing
Length (in)
 Number of
Ball Circuits
INST 2 MS1  .1250  .3125 / .3121  .500 / .485  3
 INST 3 MS1  .1875  .3750 / .3746  .562 / .547  3
 INST 4 MS1  .2500  .5000 / .4996  .750 / .735  3
(1)Dynamic Load Capacity is based on a rated travel life of 2 million inches. The actual Dynamic Load Capacity can be affected by the orientation of the bearing or the direction of the applied load.

Miniature Instrument Ball Bushing Highlights:

  • Available with a matched 60 Case LinearRace
  • Coefficient of friction as low as .001
  • Available sizes 1/8, 3/16, and 1/4" bore diameter
  • Compact size for low inertia and weight
  • Load Capacity range between 7 and 19lbs
  • Precision bearing balls, sleeve and 60 Case LinearRace manufactured of corrosion resistant stainless steel

Find a Product

Nominal Diameter

Load Capacity


Bearing Sub Type

Bearing Style

Bearing Adjustable


Corrosion Resistant



Max Operation Temperature

Product Family

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CAD Models

  • Configurable 2D/3D Partstream Models
  • Configurable 2D/3D Solidcomponents Models
  • Configurable 2D/3D PartServer Models
  • Static 2D/3D Model file downloads

NOTE: Please use Internet Explorer 11, Edge, Firefox, or Google Chrome with Edrawings Viewer

Partstream Interactive Viewer Instructions:
1) Select a product from the table below and Configure your model to the right of the viewer that appears.
2) Click the Create button at the bottom of the configurator and wait for model to load (may take a few minutes).
3) Click the Download tab and login to your account if requested (or register as a first-time user).
4) Select a format, wait for the file to be created (may take a few minutes), and click the Download button.

Miniature Instrument Ball Bushing Bearing 2D/3D Interactive Models
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