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NRT 650 A

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NRT 650 A

Axial-radial cylindrical super-precision roller bearing
Axial-radial cylindrical super-precision roller bearings can accommodate radial loads, axial loads in both directions and moment loads, whether acting singly, or simultaneously, in any combination. With high running accuracy, high load capacity and rigidity, SKF super-precision axial radial cylindrical roller bearings are ideal for rotary tables, indexing heads, and multi spindle heads. The bearing minimizes noise, vibration and heat generation.

  • Accommodate radial and axial loads in both directions
  • Designed for low-medium speed performance
  • Handle moment loads
  • Close tolerances
  • Minimizing noise, vibration and heat generation

Description

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Dimensions - NRT 650 ADimensions - NRT 650 A

Dimensions

d

650 mm

Bore diameter
D

870 mm

Outside diameter
H

122 mm

Height
d1

800 mm

Shoulder diameter inner ring – large shoulder
C

34 mm

Outer ring (housing washer) width
H1

78 mm

Distance
J

680 mm

Inner ring (shaft/locating washer) hole pitch circle diameter
J1

830 mm

Outer ring (housing washer) hole pitch circle diameter
N

14 mm

Inner ring (shaft/locating washer) through hole
N1

20 mm

Inner ring (shaft washer) sinkhole
N2

14 mm

Outer ring (housing washer) through hole
a

13 mm

Inner ring (shaft washer) sinkhole depth
r1

min. 1 mm

Outer ring (housing washer) chamfer dimension
r2

min. 1 mm

Chamfer dimension

Calculation data

Basic dynamic load rating – radial directionC

413 kN

Basic static load rating – radial directionC0

1 600 kN

Basic dynamic load rating – axial directionC

365 kN

Basic static load rating – axial directionC0

5 000 kN

Attainable speed for grease lubrication

55 r/min

Attainable speed for oil-air lubrication

110 r/min

Axial preload

27 kN

Axial unloading force

59 kN

Frictional momentCRL

200 N·m

Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face)

60 000 000 kN/µm

Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face)

17 200 000 kN/µm

Moment stiffness

3 209 kN·m/mrad

Mass

Mass bearing

170 kg

Rotary table

Guideline rotary table diameter

1 450 mm

Mounting information

Retaining bolts
Size

M12

Number of bolts

2

Angle between bolts

180 °

Removal threads
SizeG

M12

Number of threads

6

Angle between threads

60 °

Required attachment bolts, shaft
Bolt size

M12

Pitchα

7.5 °

Number of bolts

46

Number of bolts omitted at retaining bolts position

2, 180° apart

Tightening torque (Bolt grade 10.9)

116 N·m

Required attachment bolts, housing
Bolt size

M12

Pitchα

7.5 °

Number of bolts

42

Number of bolts omitted at removal thread position

6, 60° apart

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