NJ308ET7

Single-Row Cylindrical Roller Bearings

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Parts Number
NJ308ET7 Single-Row Cylindrical Roller Bearings			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Parts Number

NJ308ET7

Boundary Dimensions

d	40	mm	Bore diameter
D	90	mm	Outside diameter
B	23	mm	Width
FW	52	mm	Raceway diameter of inner ring
r (min.)	1.5	mm	Chamfer dimension
r1 (min.)	1.5	mm	Chamfer dimension

Basic Load Ratings

C_r	102000	N	Basic dynamic load rating
C_0r	81500	N	Basic static load rating

Speeds

Thermal Speed Rating (Oil-bath)	7500	min^-1	Oil-bath lubrication subject to conditions outlined in ISO 15312
Mechanical (forced-circulation oil)	10000	min^-1	Properly designed and controlled forced-circulation oil lubrication
Grease	6700	min^-1	Grease lubrication
Oil (Oil-bath)	8000	min^-1	Oil-bath lubrication

Abutment and Fillet Dimensions

db (min.)	48	mm	Diameter of shaft / spacer sleeve abutment
db (max.)	50	mm	Diameter of shaft / spacer sleeve abutment
dd (min.)	60	mm	Diameter of shaft abutment
Da (max.)	82	mm	Diameter of housing abutment
ra (max.)	1.5	mm	Radius of shaft or housing fillet

Mass

(approx.)

0.663

Drawing for Reference

Designations	Boundary Dimensions			Basic Load Ratings		Radial Internal Clearance			Tolerance Class	Speeds				Mass
	Boundary Dimensions			Basic Load Ratings		Radial Internal Clearance					Limiting Speeds			Mass
	d (mm)	D (mm)	B (mm)	C_r (N)	C_0r (N)		min	max		Thermal Speed Rating (Oil-bath) (min^-1)	Mechanical (forced-circulation oil) (min^-1)	Grease (min^-1)	Oil (Oil-bath) (min^-1)	(approx.) (kg)
NJ308ET7	40	90	23	102000	81500				ISO NORMAL CLASS	7500	10000	6700	8000	0.663

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Not to scale.
(*) The chamfer dimensions are minimum values.
The ** mark is the roller inscribed circle diameter.
The *** mark is the roller circumscribed circle diameter.
If axial loads are applied, increase da and reduce Da from the values on drawing.
db(max) refers to values for adjusting rings for NU and NJ bearings.

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_SR
NSK Product Type	Bearing
Designations	NJ308ET7

NJ308ET7

Parts Number

Boundary Dimensions

Basic Load Ratings

Speeds

Abutment and Fillet Dimensions

Mass

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