21304CDKE4

Spherical Roller Bearings

21304CDKE4

Spherical Roller Bearings

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Parts Number
21304CDKE4

Product Information

Display units Metric Imperial

Parts Number

21304CDKE4

Boundary Dimensions

d	20	mm	Bore diameter
D	52	mm	Outside diameter
B	15	mm	Width
r (min.)	1.1	mm	Chamfer dimension

Basic Load Ratings

Cr	29300	N	Basic dynamic load rating
C0r	26900	N	Basic static load rating

Speeds

Thermal Speed Rating (Oil-bath)	10000	min-1	Oil-bath lubrication subject to conditions outlined in ISO 15312
Grease	6300	min-1	Grease lubrication
Oil (Oil-bath)	8200	min-1	Oil-bath lubrication

Abutment and Fillet Dimensions

da (min.)	27	mm	Diameter of shaft abutment
da (max.)	28	mm	Diameter of shaft abutment
Da (min.)	42	mm	Diameter of housing abutment
Da (max.)	45	mm	Diameter of housing abutment
ra (max.)	1	mm	Radius of shaft or housing fillet

Calculation factors

e	0.31	Constant
Y2	3.2	Axial load Factors
Y3	2.1	Axial load Factors
Y0	2.1	Axial load Factors

Mass

Mass approx.

0.17

Mass approx.

CAD

FAQs (3)

Customer Questions

How do I lubricate spherical roller bearings? Are oil grooves and oil holes provided?

Yes, oil grooves and oil holes come standard in the outer ring of NSK spherical roller bearings for easy lubrication. These are indicated by “E4” in the designation.

How is using two tapered roller bearings different from using a spherical roller bearing?

Assuming that a face-to-face combination (DF arrangement) with the same roller arrangement is used, the biggest differences are the amount of permissible misalignment and the spherical roller bearing's capacity for self-alignment.

What grease is recommended for spherical roller bearings?

We generally recommend Shell Alvania S2 grease (AS2) for spherical roller bearings.

More Information

More Information
NSK Product Type2	SRB_CTB
NSK Product Type	Bearing

Spherical Roller Bearings

Spherical Roller Bearings

Parts Number

Boundary Dimensions

Basic Load Ratings

Speeds

Abutment and Fillet Dimensions

Calculation factors

Mass

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