SKF NRT 325 B Axial-radial cylindrical roller bearings, super-precision

SKF NRT 325 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		325	mm
D		450	mm
H		60	mm
d1		415	mm
C		20	mm
H1		40	mm
J		342	mm
J1		430	mm
N		9.3	mm
N1		15	mm
N2		9.3	mm
a		8.2	mm
r1	min.	0.6	mm
r2	min.	0.6	mm

Calculation data

Basic dynamic load rating - radial direction	C		134	kN
Basic static load rating - radial direction	C0		450	kN
Basic dynamic load rating - axial direction	C		153	kN
Basic static load rating - axial direction	C0		1660	kN
Attainable speed for grease lubrication			110	r/min
Attainable speed for oil-air lubrication			220	r/min
Axial preload			12	kN
Axial unloading force			26	kN
Frictional moment	CRL		45	N·m
Axial stiffness			28.6	kN/µm
Radial stiffness			8.9	kN/µm
Moment stiffness			427	kN·m/mrad

Mass

Mass bearing

25

kg

Rotary table

Guideline diameter

700

mm

Mounting information

Retaining bolts
Size			M8
Number of bolts			2
Angle between bolts			180	°
Removal threads
Size	G		M12
Number of threads			3
Angle between threads			120	°
Required attachment bolts, shaft
Bolt size			M8
Pitch	α		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
Pitch	α		10	°
Number of bolts			33
Number of bolts omitted at removal thread position			3, 120° apart

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