NN3068

Double-Row Cylindrical Roller Bearings

NN3068

Double-Row Cylindrical Roller Bearings

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Parts Number
NN3068

Product Information

Display units Metric Imperial

Parts Number

NN3068

Boundary Dimensions

d	340	mm	Bore diameter
D	520	mm	Outside diameter
B	133	mm	Width
EW	473	mm	Raceway diameter of outer ring
r (min.)	5	mm	Chamfer dimension

Basic Load Ratings

Cr	2050000	N	Basic dynamic load rating
C0r	3300000	N	Basic static load rating

Speeds

Grease	1000	min-1	Grease lubrication
Oil (Oil-bath)	1200	min-1	Oil-bath lubrication

Abutment and Fillet Dimensions

da (min.)	360	mm	Diameter of shaft abutment
d1a (min.)	365	mm	Diameter of spacer sleeve abutment
Da (min.)	477	mm	Diameter of housing abutment
Da (max.)	500	mm	Diameter of housing abutment
rb (max.)	4	mm	Radius of shaft or housing fillet

Mass

Mass approx.

102

Mass approx.

CAD

FAQs (3)

Customer Questions

How do ball bearings and roller bearings differ?

Ball bearings are ideal for high-speed rotation, while roller bearings are more suited for high loads.

Do cylindrical roller bearings come with seals?

Because cylindrical roller bearings have separable inner and outer rings, they generally come in an open specification without seals.
As such, please apply seals or other protection around the equipment mounting.

How are the EW, EM, and ET Series different?

EW Series bearings are small and utilize pressed cages, making them suitable for standard operating conditions.
ET Series bearings use polyamide-resin cages suited for high temperatures.
Finally, EM Series bearings have machined brass cages for use in harsh applications such as gearboxes and vibrating machinery or in environments where the bearing must be quiet, such as in mid-to-large size motors.

More Information

More Information
NSK Product Type2	CRB_DR
NSK Product Type	Bearing

Double-Row Cylindrical Roller Bearings

Double-Row Cylindrical Roller Bearings

Parts Number

Boundary Dimensions

Basic Load Ratings

Speeds

Abutment and Fillet Dimensions

Mass

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