Page 182 - needle bearings

Inner rings
NTN

Type IR

d 20ʙ28mm

Boundary dimensions Bearing numbers Abutment Mass
dimensions
mm mm kg
da ras
d F 1) B rs min 2) t min max (approx.)
25 26 0.3 1.8 IR20ʷʷ25ʷʷ26 22 0.3 0.034
25 26.5 0.3 ʵ ˞ IR20ʷʷ25ʷʷ26.5 22 0.3 0.036
25 0 30 0.3 1.8 IR20ʷʷ25ʷʷ30 22 0.3 0.041
20 ʵ0.009
25 32 0.3 1.8 IR20ʷʷ25ʷʷ32 22 0.3 0.041
25 38.5 0.3 ʵ ˞ IR20ʷʷ25ʷʷ38.5 22 0.3 0.053
28 20 0.6 1.8 IR20ʷʷ28ʷʷ20 24 0.6 0.045
26 16 0.3 1.8 IR22ʷʷ26ʷʷ16 24 0.3 0.017
26 20 0.3 ʵ ˞ IR22ʷʷ26ʷʷ20 24 0.3 0.022
28 17 0.3 1.8 IR22ʷʷ28ʷʷ17 24 0.3 0.030
0
22 28 20 0.3 1.8 IR22ʷʷ28ʷʷ20 24 0.3 0.035
ʵ0.009
28 20.5 0.3 1.8 IR22ʷʷ28ʷʷ20.5 24 0.3 0.036
28 23 0.3 1.8 IR22ʷʷ28ʷʷ23 24 0.3 0.042
28 30 0.3 ʵ ˞ IR22ʷʷ28ʷʷ30 24 0.3 0.054
29 20 0.3 ʵ ˞ IR25ʷʷ29ʷʷ20 27 0.3 0.026
29 30 0.3 1.8 IR25ʷʷ29ʷʷ30 27 0.3 0.039
30 12.5 0.3 1.8 IR25ʷʷ30ʷʷ12.5 27 0.3 0.020
30 16 0.3 1 IR25ʷʷ30ʷʷ16 27 0.3 0.024
30 16.5 0.3 1.8 IR25ʷʷ30ʷʷ16.5 27 0.3 0.026
30 17 0.3 1.8 IR25ʷʷ30ʷʷ17 27 0.3 0.027
30 18 0.3 ʵ ˞ IR25ʷʷ30ʷʷ18 27 0.3 0.030
30 0 20 0.3 1.8 IR25ʷʷ30ʷʷ20 27 0.3 0.033
ʵ0.009
25 30 20.5 0.3 1.8 IR25ʷʷ30ʷʷ20.5 27 0.3 0.034
30 23 0.3 1.8 IR25ʷʷ30ʷʷ23 27 0.3 0.038
30 26 0.3 1.8 IR25ʷʷ30ʷʷ26 27 0.3 0.041
30 26.5 0.3 ʵ ˞ IR25ʷʷ30ʷʷ26.5 27 0.3 0.043
30 30 0.3 1.8 IR25ʷʷ30ʷʷ30 27 0.3 0.050
30 32 0.3 1 IR25ʷʷ30ʷʷ32 27 0.3 0.054
30 38.5 0.3 ʵ ˞ IR25ʷʷ30ʷʷ38.5 27 0.3 0.064
32 ʴ0.008 22 0.6 1.8 IR25ʷʷ32ʷʷ22 29 0.6 0.052
ʵ0.002
32 30.5 0.6 1.8 IR25ʷʷ32ʷʷ30.5 29 0.6 0.072
28 32 ʵ0.008 17 0.3 1.8 IR28ʷʷ32ʷʷ17 30 0.3 0.025
ʵ0.002
Note 1) Dimensional tolerance to secure ordinary clearance when any of these inner rings is combined with needle roller bearing with no inner ring.
2) Allowable minimum chamfer dimension r .
Remarks: 1. Nominal number plus ˞-mark represents inner ring with fine-chamfered outer surface.
B-120