QJ 308 MA

Four-point contact ball bearing

Four-point contact ball bearings can accommodate high axial loads in both directions and small radial loads.

They can operate at very high speeds and are more suitable than deep groove ball bearings for supporting large axial forces. The outer ring, with ball and cage assembly, can be mounted separately from the two inner ring halves.

  • High-speed capability
  • Accommodate high axial loads in both directions and small radial loads
  • Require considerably less axial space than double row angular contact ball bearings

Dimensions

d
40 mm
 Bore diameter
D
90 mm
 Outside diameter
B
23 mm
 Width
d1
≈52 mm
 Shoulder diameter inner ring
D1
≈72.5 mm
 Shoulder diameter outer ring/ inner diameter housing washer
a
46 mm
 Distance pressure point(s)
r1,2
min.1.5 mm
 Chamfer dimension inner ring
Abutment dimensions - QJ 308 MA

Abutment dimensions

da
min.49 mm
 Abutment diameter shaft
Da
max.81 mm
 Abutment diameter housing
ra
max.1.5 mm
 Fillet radius

Calculation data

SKF performance class
SKF Explorer
Basic dynamic load rating C
78 kN
Basic static load rating C0
64 kN
Fatigue load limit Pu
2.7 kN
Limiting speed
14 000 r/min
Calculation factor A
0.0118
Limiting value e
0.95
Calculation factor X
0.6
Calculation factor Y0
0.58
Calculation factor Y1
0.66
Calculation factor Y2
1.07
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SKU: QJ 308 MA-SKF Categories: , ,
SKF

Description

Properties

Contact type Four-point contact
Number of rows 1
Locating feature, bearing outer ring None
Ring type Two-piece inner ring and one-piece outer ring
Cage Machined metal
Matched arrangement No
Universal matching bearing No
Axial internal clearance CN
Material, bearing Bearing steel
Coating Without
Sealing Without
Lubricant None
Relubrication feature Without

Logistics

Product net weight 0.771 kg
eClass code 23-05-08-05
UNSPSC code 31171538

(40X90X23) (QJ308MA)

Additional information

Weight 0.771 kg
Size (mm)

Colour

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