NNU4948-S-K-M-SP

Cylindrical roller bearing

Super precision cylindrical roller bearings NNU49..-S-K-M-SP, non-locating bearing, double row, with tapered bore, taper 1:12, separable, with cage

Display units

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Imperial

Main Dimensions & Performance Data

d	240 mm	Bore diameter
D	320 mm	Outside diameter
B	80 mm	Width
C_r	530,000 N	Basic dynamic load rating, radial
C_0r	1,210,000 N	Basic static load rating, radial
C_ur	138,000 N	Fatigue load limit, radial
n_{G Grease}	2,400 1/min	Limiting speed for grease lubrication
n_{G Oil}	2,800 1/min	Limiting speed for oil lubrication
≈m	25.6 kg	Weight

Mounting dimensions

d_a	263 mm	diameter shaft shoulder
	h12	diameter shaft shoulder tolerance
D_a	299 mm	diameter of housing shoulder
	H12	diameter of housing shoulder tolerance
r_{a1 max}	2.1 mm	Maximum recess radius

Dimensions

Temperature range

T_min	-30 °C	Operating temperature min.
T_max	150 °C	Operating temperature max.

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Cage	M	Brass Cage
Tolerance class	SP	tolerance class SP
Bore type	K	Tapered, taper 1:12
Locating Feature , bearing outer ring	S	Lubrication holes and lubrication groove in outer ring
Radial internal clearance	C1	Group 1 (C1)
Number of rolling element rows	2	Double-row design

Characteristics

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