N256M Series

Single-Row Cylindrical Roller Bearings

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Radial Internal Clearance

Tolerance

Grouped product items
Parts Number
N256M Single-Row Cylindrical Roller Bearings			Add to Compare You can use this service by registering as a member.
N256MC3 Single-Row Cylindrical Roller Bearings			Add to Compare You can use this service by registering as a member.
N256MC2 Single-Row Cylindrical Roller Bearings			Add to Compare You can use this service by registering as a member.
N256MC4 Single-Row Cylindrical Roller Bearings			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

N256M

Boundary Dimensions

d	280	mm	Bore diameter
D	500	mm	Outside diameter
B	80	mm	Width
EW	440	mm	Raceway diameter of outer ring
r (min.)	5	mm	Chamfer dimension
r1 (min.)	5	mm	Chamfer dimension

Basic Load Ratings

C_r	1410000	N	Basic dynamic load rating
C_0r	1680000	N	Basic static load rating

Speeds

Thermal Speed Rating (Oil-bath)	1300	min^-1	Oil-bath lubrication subject to conditions outlined in ISO 15312
Grease	1100	min^-1	Grease lubrication
Oil (Oil-bath)	1400	min^-1	Oil-bath lubrication

Abutment and Fillet Dimensions

da (min.)	300	mm	Diameter of shaft abutment
Db (min.)	448	mm	Diameter of housing abutment
Db (max.)	480	mm	Diameter of housing abutment
ra (max.)	4	mm	Radius of shaft or housing fillet
rb (max.)	4	mm	Radius of shaft or housing fillet

Mass

(approx.)

69.6

Drawing for Reference

Designations	Boundary Dimensions			Basic Load Ratings		Radial Internal Clearance			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)
N256M	280	500	80	1410000	1680000				1300		1100	1400	69.6

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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	N256M