NRT 850 AAxial-radial cylindrical super-precision roller bearing

SKU: NRT 850 AAxial-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.

ID:100345

Dimensions - NRT 850 ADimensions - NRT 850 A

Dimensions

d
850 mm
Bore diameter
D
1 095 mm
Outside diameter
H
124 mm
Height
d1
1 018 mm
Shoulder diameter inner ring – large shoulder
C
37 mm
Outer ring (housing washer) width
H1
80.5 mm
Distance
J
890 mm
Inner ring (shaft/locating washer) hole pitch circle diameter
J1
1 055 mm
Outer ring (housing washer) hole pitch circle diameter
N
18 mm
Inner ring (shaft/locating washer) through hole
N1
26 mm
Inner ring (shaft washer) sinkhole
N2
18 mm
Outer ring (housing washer) through hole
a
17 mm
Inner ring (shaft washer) sinkhole depth
r1
min. 1.5 mm
Outer ring (housing washer) chamfer dimension
r2
min. 1.5 mm
Chamfer dimension

Calculation data

Basic dynamic load rating – radial direction C
473 kN
Basic static load rating – radial direction C0
2 120 kN
Basic dynamic load rating – axial direction C
415 kN
Basic static load rating – axial direction C0
6 400 kN
Attainable speed for grease lubrication
40 r/min
Attainable speed for oil-air lubrication
80 r/min
Axial preload
47 kN
Axial unloading force
103 kN
Frictional moment CRL
300 N·m
Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face)
77 000 000 kN/µm
Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face)
22 400 000 kN/µm
Moment stiffness
7 011 kN·m/mrad

Mass

Mass bearing
253 kg

Rotary table

Guideline rotary table diameter
1 800 mm

Mounting information

Retaining bolts
Size
M16
Number of bolts
2
Angle between bolts
180 °
Removal threads
Size G
M16
Number of threads
6
Angle between threads
60 °
Required attachment bolts, shaft
Bolt size
M16
Pitch α
6 °
Number of bolts
58
Number of bolts omitted at retaining bolts position
2, 180° apart
Tightening torque (Bolt grade 10.9)
284 N·m
Required attachment bolts, housing
Bolt size
M16
Pitch α
6 °
Number of bolts
54
Number of bolts omitted at removal thread position
6, 60° apart

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