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NJ217 Nachi Cylindrical Roller
Bearings, Steel Cage, Made in Japan, the NJ217 inner
diameter is 85mm, the NJ217 outer diameter is 150mm,
NJ217 width is 28mm.
Construction of this roller bearing type is the simplest of all
radial roller bearings. This bearing type is often used in
high-speed applications. Because the inner ring, outer ring, and
rollers are in line contact, this bearing type has a large radial
load capacity. Various Cylindrical roller bearing configurations
are:N,NJ,NF,NU,RNU : integral ribs (flanges)
NH,NP,NUP,NUH : integral and loose ribs
NN,NNU : double-row bearings
Configurations having integral flanges or loose ribs on both the
inner and outer rings can sustain a small amount of axial load.
Since this bearing type supports axial loads as sliding action
between the end of the rollers and flange faces, axial loading is
limited. Double-row Cylindrical roller bearings are used for
high-speed, high-accuracy applications such as; main spindle
support for lathes, milling machines, and machining centers.
Radial clearance of tapered-bore bearings can be adjusted during
mounting of the bearing(s) onto the mating journal. Standard
cages are pressed steel or polyamide resin. Machined cages of
high-strength brass are used for bearings of large dimension or
for high-speed applications.
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