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NRT 200 B

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NRT 200 B

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 200 BDimensions - NRT 200 B

Dimensions

d

200 mm

Bore diameter
D

300 mm

Outside diameter
H

45 mm

Height
d1

274 mm

Shoulder diameter inner ring – large shoulder
C

15 mm

Outer ring (housing washer) width
H1

30 mm

Distance
J

215 mm

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

285 mm

Outer ring (housing washer) hole pitch circle diameter
N

7 mm

Inner ring (shaft/locating washer) through hole
N1

11 mm

Inner ring (shaft washer) sinkhole
N2

7 mm

Outer ring (housing washer) through hole
a

6.2 mm

Inner ring (shaft washer) sinkhole depth
r1

min. 0.6 mm

Outer ring (housing washer) chamfer dimension
r2

min. 0.3 mm

Chamfer dimension

Calculation data

Basic dynamic load rating – radial directionC

93.5 kN

Basic static load rating – radial directionC0

270 kN

Basic dynamic load rating – axial directionC

85 kN

Basic static load rating – axial directionC0

630 kN

Attainable speed for grease lubrication

170 r/min

Attainable speed for oil-air lubrication

340 r/min

Axial preload

2.9 kN

Axial unloading force

6.2 kN

Frictional momentCRL

14 N·m

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

12 000 000 kN/µm

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

6 500 000 kN/µm

Moment stiffness

75 kN·m/mrad

Mass

Mass bearing

9.5 kg

Rotary table

Guideline rotary table diameter

500 mm

Mounting information

Retaining bolts
Size

M6

Number of bolts

2

Angle between bolts

180 °

Removal threads
SizeG

M8

Number of threads

3

Angle between threads

120 °

Required attachment bolts, shaft
Bolt size

M6

Pitchα

7.5 °

Number of bolts

46

Number of bolts omitted at retaining bolts position

2, 180° apart

Tightening torque (Bolt grade 10.9)

14 N·m

Required attachment bolts, housing
Bolt size

M6

Pitchα

7.5 °

Number of bolts

45

Number of bolts omitted at removal thread position

3, 120° apart

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