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Bearing terminology

To better understand frequently used bearing specific terms for

  • Y-bearings
  • Y-bearing plummer block units
  • Y-bearing flanged units
  • Y-bearing take-up units
  • the terms and their definitions are provided below. Essentially these terms con-form to those found in the following ISO standards:

  • ISO 3228:1993 “Rolling bearings – Cast and pressed housings for insert bearings”.
  • ISO 9628:1992 “Rolling bearings – Insert bearings and eccentric locking collars”.
  • A detailed collection of bearing specific terms and definitions can be found in ISO 5593:1997 “Rolling bearings – Vocabulary”.


    1. Outer ring
    2. Sphered outer surface
    3. Lubrication hole
    4. Inner ring
    5. Bore
    6. Cage
    7. Ball
    8. Superagriseal
    9. Flinger
    10. Eccenteric locking collar
    11. Grub screw

    Y-bearing plummer block unit

    1. Y-bearing plummer (pillow) block housing of grey cast iron
    2. Housing base
    3. Housing support face
    4. Cast dimple for dowel pin
    5. Attachment bolt hole
    6. Y-bearing
    7. Grease nipple
    8. Recess for end cover
    9. Filling slot for Y-bearing

    Y-bearing flanged unit

    1. Square flanged housing of grey cast iron
    2. Attachment bolt hole
    3. Back of flanged housing with or without centring recess
    4. Cast dimple for dowel pin
    5. Y-bearing
    6. Grease nipple
    7. Filling slot for Y-bearing
    8. Recess for end cover

    Y-bearing take-up unit

    1. Take-up housing of grey cast iron
    2. Grease nipple
    3. Y-bearing
    4. Piloting groove
    5. Recess for end cover
    6. Receiving opening for adjustment screw location
    7. Centre bore for adjustment screw
    8. Filling slot for Y-bearing

    Terminology | Y-bearings with grub screw locking | Y-bearings with an eccentric locking collar | Y-bearings with a tapered bore | Y-bearings with a standard inner ring | Y-bearings with a hexagonal or square bore | Special design bearings | Seals | Dimensions | Tolerances | Radial internal clearance | Cages | Grease fill | Speeds | Shaft tolerances | Rubber seat rings | Axial load carrying ability | Equivalent bearing load | Mounting and dismounting | Designations

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    This page is still under construction. All bearing information remains the property and copyright of SKF Group.