Two-Bolt Flange
|
PFL: 2-Bolt Pressed Steel Housing
|
This elliptically shaped housing uses, as the name implies, two-bolts
to fasten the unit to the machinery. They are made of cast iron
or stamped steel material and carry the NTN nomenclature designation
of FL (iron) and PFL (pressed steel).
The two bolt holes are normally positioned on opposite sides of
the housing. The center line of each hole aligns with the center
line of the shaft. As stated earlier, the dimensions important for
mounting and replacing the units are:
- The shaft diameter
- The distance between bolt hole centers —
This measurement is taken from the center of one bolt hole to
the center of the other.
The shaft size and the distance between bolt hole centers for two-bolt
flanges are listed in the appropriate NTN catalog. Table
2 above provides a brief example of the dimensional
details available. In the section listed, the details are provided
for a two-bolt flange fitting a one-inch diameter shaft. From this
you may select the proper distance or spacing between bolt hole
centers for the various units.
Note: The housing thickness may vary according to the housing
series; this factor should be considered when selecting the proper
flange bearing unit for the application.
| Table 2: Two-bolt flanged housing variations—1"
diameter |
2-Bolt
flange
housing type |
Insert
bearing
series |
Bolt
center
distance (inch) |
Housing
material |
Application
duty |
FD
PFL
FL
FLU
FL2 |
2
2
2
2
2 (Adapter) |
2 63/64
2 63/64
3 57/64
3 57/64
4 39/64 |
Cast Iron
Pressed Steel
Cast Iron
Cast Iron
Cast Iron |
Normal
Light
Normal
Normal
Normal |
FL
FL |
X
X (Adapter) |
3 39/64
5 1/8 |
Cast Iron
Cast Iron |
Medium
Medium |
| FL |
3 |
4 29/64 |
Cast Iron |
Heavy |
|
