Page 116 - needle bearings

Machined ring needle roller bearings
NTN

Machined Ring Needle Roller Bearings

The machined ring of this bearing type contains needle requiring high speed, high load and high running
rollers and a cage. And the outer ring and the needle accuracy. These machined ring needle roller bearings are
rollers are inseparable from each other by means of available in two types -- one without inner ring and
double-side ribs on the outer ring or side plates. another with inner ring -- considering the case of using a
Because of its machined (solid) outer ring enabling to shaft as the direct raceway surface without using inner
make it more rigid and to thereby upgrade the bearing ring.
accuracy, this bearing type is suitable for an application
Applied shaft Composition of
Bearing type diameter (mm) nominal bearing number Remarks

Type RNA49

П7ʙП12
RNA 49 5 T2
Bearing with tail code T2 uses a polyamide
resin cage and, therefore, it shall be used
Tail code
at allowable temperature 120˚C and, under
Bore dia. No.
continuous running, at 100˚C and less.
Dimension series
Type NA49
Type code The dimension series is in compliance
with JIS B 1512 or ISO 15.
[Tail code]
T2: Resin cage
П5ʙП9

Type RNA49ʝR

П14ʙП490
RNA 49 02 R
With seal Bearing with seal type (Tail code: L or LL)
П14ʙП58 Tail code - synthetic rubber seal built in at single side
or double sides is internally filled up with
Bore dia. No.
ithium soap base grease.
Dimension series
Type code The sealed bearing type shall be used
within the temperature range of -25 to
Type NA49ʝR
100˚C to prevent deterioration of the seal
and filled-up grease.
П10ʙП440 [Tail code]
R: Rib type The dimension series is in compliance with
With seal L: Single-side seal type JIS B 15 or ISO 15.
LL: Double-side seal type
П10ʙП50

B-54