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NRT 260 B

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NRT 260 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 260 BDimensions - NRT 260 B

Dimensions

d

260 mm

Bore diameter
D

385 mm

Outside diameter
H

55 mm

Height
d1

345 mm

Shoulder diameter inner ring – large shoulder
C

18 mm

Outer ring (housing washer) width
H1

36.5 mm

Distance
J

280 mm

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

365 mm

Outer ring (housing washer) hole pitch circle diameter
N

9.3 mm

Inner ring (shaft/locating washer) through hole
N1

15 mm

Inner ring (shaft washer) sinkhole
N2

9.3 mm

Outer ring (housing washer) through hole
a

8.2 mm

Inner ring (shaft washer) sinkhole depth
r1

min. 0.6 mm

Outer ring (housing washer) chamfer dimension
r2

min. 0.6 mm

Chamfer dimension

Calculation data

Basic dynamic load rating – radial directionC

108 kN

Basic static load rating – radial directionC0

355 kN

Basic dynamic load rating – axial directionC

95 kN

Basic static load rating – axial directionC0

780 kN

Attainable speed for grease lubrication

130 r/min

Attainable speed for oil-air lubrication

260 r/min

Axial preload

7.3 kN

Axial unloading force

16 kN

Frictional momentCRL

25 N·m

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

14 700 000 kN/µm

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

8 300 000 kN/µm

Moment stiffness

153 kN·m/mrad

Mass

Mass bearing

18.2 kg

Rotary table

Guideline rotary table diameter

630 mm

Mounting information

Retaining bolts
Size

M8

Number of bolts

2

Angle between bolts

180 °

Removal threads
SizeG

M12

Number of threads

3

Angle between threads

120 °

Required attachment bolts, shaft
Bolt size

M8

Pitchα

10 °

Number of bolts

34

Number of bolts omitted at retaining bolts position

2, 180° apart

Tightening torque (Bolt grade 10.9)

34 N·m

Required attachment bolts, housing
Bolt size

M8

Pitchα

10 °

Number of bolts

33

Number of bolts omitted at removal thread position

3, 120° apart

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