308 NR

Deep groove ball bearing with filling slots and snap ring

Single row deep groove ball bearings with filling slots and a snap ring accommodate more balls than standard deep groove ball bearings. They are of a simple, yet versatile, design and are robust in operation, requiring little maintenance.

They can accommodate radial and axial loads in both directions. They have a higher radial load carrying capacity than the corresponding bearings without filling slots but have a limited axial load carrying capacity due to the filling slots. The snap ring, fitted in an annular groove in the outer ring, facilitates axial location of the bearings within their housings.

  • Snap ring facilitates axial location within housing
  • Simple, versatile and robust design
  • Accommodate higher radial loads than corresponding bearings without filling slots, with limited axial loads in both directions
  • Require little maintenance

Dimensions

d
40 mm
Bore diameter
D
90 mm
Outside diameter
B
23 mm
Width
d1
56.11 mm
Shoulder diameter
D2
77.7 mm
Recess diameter
D3
86.79 mm
Diameter of snap ring groove
D4
96.5 mm
Outside diameter of snap ring
b
2.7 mm
Width of snap ring groove
C
3.28 mm
Distance from outer ring side face to snap ring groove
f
2.46 mm
Width of snap ring
r0
max.0.6 mm
Bottom radius of snap ring groove
r1,2
min.1.5 mm
Chamfer dimension
Abutment dimensions - 308 NR

Abutment dimensions

da
min.49 mm
Diameter of shaft abutment
Da
max.81 mm
Diameter of housing abutment
Db
min.98 mm
Diameter of snap ring recess in the housing
ba
min.3 mm
Width of snap ring recess in the housing
Ca
max.5.74 mm
Distance from outer ring side face to snap ring back face
ra
max.1.5 mm
Radius of shaft or housing fillet

Calculation data

Basic dynamic load rating C
45.7 kN
Basic static load rating C0
36 kN
Fatigue load limit Pu
1.53 kN
Reference speed
14 000 r/min
Limiting speed
8 500 r/min
Minimum load factor kr
0.05

Included products

Snap ring
SP 90

Tolerance class

Dimensional tolerances
Normal
Radial run-out
Normal

Properties

Filling slots With
Number of rows 1
Locating feature, bearing outer ring Snap ring (fitted)
Bore type Cylindrical
Cage Sheet metal
Matched arrangement No
Radial internal clearance CN
Material, bearing Bearing steel
Coating Without
Sealing Without
Lubricant None
Relubrication feature Without

Logistics

Product net weight 0.686 kg
eClass code 23-05-08-01
UNSPSC code 31171504

(308NR) (40X90X23)

Additional information

Weight 0.686 kg
Size (mm)

Colour