3311 DMA

Double row angular contact ball bearing with two-piece inner ring

Double row angular contact ball bearings, with two-piece inner ring, correspond to a pair of single row angular contact ball bearings in a back-to-back arrangement, while requiring less axial space than the equivalent pair of single row angular contact ball bearings.

The two-piece inner ring enables incorporation of a larger number of balls, with a larger contact angle, providing a high load carrying capacity, especially in the axial direction.

  • Accommodate very high axial loads in both directions, radial loads, and tilting moments
  • Suitable where a stiff bearing arrangement is required
  • Separable design means outer ring with ball and cage assemblies can be mounted independently of the inner ring halves

Dimensions

d
55 mm
Bore diameter
D
120 mm
Outside diameter
B
49.2 mm
Width
d1
≈81.4 mm
Shoulder diameter inner ring for two-piece inner ring
D1
≈104.4 mm
Shoulder diameter outer ring
r1,2
min.2 mm
Chamfer dimension inner ring for two-piece inner ring
a
114 mm
Distance pressure point(s)

Calculation data

Basic dynamic load rating C
111 kN
Basic static load rating C0
100 kN
Fatigue load limit Pu
4.3 kN
Reference speed
6 000 r/min
Limiting speed
5 000 r/min
Calculation factor kr
0.095
Limiting value e
1.34
Calculation factor X
0.54
Calculation factor Y0
0.44
Calculation factor Y1
0.47
Calculation factor Y2
0.81

Description

Properties

Contact angle : 45 °

Contact type Normal contact (two-point contact)
Number of rows 2
Locating feature, bearing outer ring None
Ring type Two-piece inner ring and one-piece outer ring
Cage Machined metal
Arrangement of contact angle (double-row bearing) Back-to-back (O)
Matched arrangement No
Universal matching bearing No
Axial internal clearance CN
Material, bearing Bearing steel
Coating Without
Sealing Without
Lubricant None
Relubrication feature Without

(55X120X49.2) (3311DMA) (3311-DMA)

Additional information

Weight 2.8 kg
Size (mm)

Colour

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