Needle Roller Bearings - Ntn-snr.com

Machined ring needle roller bearings
NTN
Machined Ring Needle Roller Bearings
The machined ring of this bearing type contains needle
rollers and a cage. And the outer ring and the needle
rollers are inseparable from each other by means of
double-side ribs on the outer ring or side plates.
Because of its machined (solid) outer ring enabling to
make it more rigid and to thereby upgrade the bearing
accuracy, this bearing type is suitable for an application
requiring high speed, high load and high running
accuracy. These machined ring needle roller bearings are
available in two types -- one without inner ring and
another with inner ring -- considering the case of using a
shaft as the direct raceway surface without using inner
ring.
Bearing type
Applied shaft
diameter (mm)
Composition of
nominal bearing number
Remarks
Type RNA49
712
Type NA49
RNA 49 5 T2
Tail code
Bore dia. No.
Dimension series
Type code
Bearing with tail code T2 uses a polyamide
resin cage and, therefore, it shall be used
at allowable temperature 120˚C and, under
continuous running, at 100˚C and less.
The dimension series is in compliance
with JIS B 1512 or ISO 15.
59
[Tail code]
T2: Resin cage
Type RNA49R
14490
With seal
1458
RNA 49 02 R
Tail code
Bore dia. No.
Dimension series
Bearing with seal type (Tail code: L or LL)
- synthetic rubber seal built in at single side
or double sides is internally filled up with
ithium soap base grease.
Type NA49R
10440
With seal
1050
Type code
[Tail code]
R: Rib type
L: Single-side seal type
LL: Double-side seal type
The sealed bearing type shall be used
within the temperature range of -25 to
100˚C to prevent deterioration of the seal
and filled-up grease.
The dimension series is in compliance with
JIS B 15 or ISO 15.
B-54