SKF NRT 120 B Axial-radial cylindrical roller bearings, super-precision

SKF NRT 120 B Axial-radial cylindrical roller bearings, super-precision
Axial-radial cylindrical roller bearings, super-precision

Tolerances: tablePermissible moment load: diagramAccuracy of seats and abutments: shaft seats, housing seats

d		120	mm
D		210	mm
H		40	mm
d1		184	mm
C		12	mm
H1		26	mm
J		135	mm
J1		195	mm
N		7	mm
N1		11	mm
N2		7	mm
a		6.2	mm
r1	min.	0.6	mm
r2	min.	0.3	mm

Calculation data

Basic dynamic load rating - radial direction	C		64.4	kN
Basic static load rating - radial direction	C0		140	kN
Basic dynamic load rating - axial direction	C		72	kN
Basic static load rating - axial direction	C0		450	kN
Attainable speed for grease lubrication			230	r/min
Attainable speed for oil-air lubrication			460	r/min
Axial preload			2	kN
Axial unloading force			4.4	kN
Frictional moment	CRL		6	N·m
Axial stiffness			8.5	kN/µm
Radial stiffness			4.5	kN/µm
Moment stiffness			23	kN·m/mrad

Mass

Mass bearing

4.8

kg

Rotary table

Guideline diameter

315

mm

Mounting information

Retaining bolts
Size			M6
Number of bolts			2
Angle between bolts			180	°
Removal threads
Size	G		M8
Number of threads			3
Angle between threads			120	°
Required attachment bolts, shaft
Bolt size			M6
Pitch	α		15	°
Number of bolts			22
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
Pitch	α		15	°
Number of bolts			21
Number of bolts omitted at removal thread position			3, 120° apart

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