R144ZZ

Extra Small Ball Bearings and Miniature Ball Bearings Inch Series

R144ZZ

Extra Small Ball Bearings and Miniature Ball Bearings Inch Series

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Images shown are representations. Designs and specifications may differ from actual products.

Radial Internal Clearance

Tolerance

Grouped product items
Parts Number
R144ZZMC3
R144ZZMC5

Product Information

Display units Metric Imperial

Designations

R144ZZ

Boundary Dimensions

d	3.175	mm	Bore diameter
D	6.35	mm	Outside diameter
B	2.779	mm	Width
r (min.)	0.1	mm	Chamfer dimension

Basic Load Ratings

Cr	310	N	Basic dynamic load rating
C0r	95	N	Basic static load rating

Speeds

Grease

67000

min-1

Grease lubrication

Abutment and Fillet Dimensions

db (max.)	3.9	mm	Diameter of shaft abutment
Db (max.)	5.8	mm	Diameter of housing abutment
ra (max.)	0.1	mm	Radius of shaft or housing fillet

Additional information

z	7		Number of Balls
Dw	1	mm	Ball Diameter

Mass

Mass approx.

0.00027

Mass approx.

CAD

FAQs (3)

Customer Questions

What are radial loads and axial loads?

Loads are defined by their direction. Loads perpendicular to the shaft are called radial loads and loads parallel to the shaft are called axial (thrust) loads.

How do deep groove ball bearings (DGBBs) differ from single-row angular contact ball bearings?

While DGBBs can handle axial loads in both directions, single-row angular contact ball bearings can only receive axial load in one direction.

What are the differences between open, sealed, and shielded deep groove ball bearings?

Seals and shields offer additional protection for bearing components and help to improve and maintain lubrication. In terms of sealing performance, sealed bearings rank best, followed by shielded bearings, then finally open bearings.
NSK uses supplementary designations D, DU, DW, and V (DD, DDU, DDW, VV) for sealed bearings and Z (ZZ) for shielded bearings. No supplementary designations are listed for open bearings.

Drawing for Reference

Designations	Basic Load Ratings		Radial Internal Clearance			Tolerance Class	Limiting Speeds		Number of Balls	Ball Diameter		Mass
Designations	Cr (N)	C0r (N)		min	max	Tolerance Class	Grease (min-1)	Oil (Oil-bath) (min-1)	Number of Balls	(mm)	(inch)	(kg)
R144ZZ	310	95					67000		7	1	0.03937	0.00027

Not to scale.
(*) The chamfer dimensions are minimum values.

More Information

More Information
NSK Product Type2	ESM_ID
NSK Product Type	Bearing

Extra Small Ball Bearings and Miniature Ball Bearings Inch Series

Extra Small Ball Bearings and Miniature Ball Bearings Inch Series

Designations

Boundary Dimensions

Basic Load Ratings

Speeds

Abutment and Fillet Dimensions

Additional information

Mass

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