Page 190 - needle bearings

Inner rings
NTN

Type IR

d 400ʙ440mm

Boundary dimensions Bearing numbers Abutment Mass
dimensions
mm mm kg
da ras
d F 1) B rs min 2) t min max (approx.)
400 450 ʵ0.080 140 4 5 IR400ʷʷ450ʷʷ140 416 3 36.5
ʵ0.120
ʵ0.105
420 470 ʵ0.145 140 4 5 IR420ʷʷ470ʷʷ140 436 3 38.2
ʵ0.105
440 490 ʵ0.145 160 4 5 IR440ʷʷ490ʷʷ160 456 3 46.5

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 .
B-128