Major Types of Mounted Units
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| Pillow Block Unit |
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| Two-Bolt Flange Unit |
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| Three-Bolt Flange Unit |
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| Four-Bolt Square Flange Unit |
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| Cartridge |
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| Hanger Unit |
Housed bearings are categorized by the type of bearing that is
inserted into the housing. The two types are ball bearing
units and roller bearing units.
This guide will focus primarily on those mounted unit bearings using
radial ball bearing inserts. These units are available in a wide
variety of configurations and serve an even wider array of applications.
The illustrations on this page show some of the major types of mounted
units featuring radial ball bearing inserts available from NTN:
- Pillow block units
- Two-bolt flange units
- Three-bolt flange units
- Four-bolt flange units
- Four-bolt square piloted flange units
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- Four-bolt round piloted flange units
- Take-up units
- Cylindrical cartridge units
- Hanger units
- Other specialized flange units
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Note: The standard line of NTN mounted units are manufactured to
ISO specifications (the catalog lists both inch and metric dimensions),
while the premium grade Ultra-Class line of NTN mounted units is uniquely
manufactured to American industry standards.
As mentioned, the wide range of mounted bearing units includes others that
feature roller bearing inserts and heavier duty housings.Below are
some of the units also available from NTN:
- Plummer block units — Also
known as split pillow blocks, these units are designated
as SAF or SN units.
- SPW and SPWA Pillow block units —
These units feature sealed spherical bearing inserts and
one-piece housing for simplified installation and superior
bearing protection.
- SFCW flange block units —
Like the SPW units, these flanged units are sealed, one-piece
constructed units.
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Due to the complexity and variety of these roller bearing units, they
are not covered in this guide. Contact NTN for more detailed material
on these bearing units.
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