R144 Series

Extra Small Ball Bearings and Miniature Ball Bearings Inch Series

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Radial Internal Clearance

Tolerance

Grouped product items
Parts Number
R144MC3			Add to Compare You can use this service by registering as a member.
R144MC5			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

R144

Boundary Dimensions

d	3.175	mm	Bore diameter
D	6.35	mm	Outside diameter
B	2.38	mm	Width
r (min.)	0.1	mm	Chamfer dimension

Basic Load Ratings

C_r	310	N	Basic dynamic load rating
C_0r	95	N	Basic static load rating

Speeds

Grease	67000	min^-1	Grease lubrication
Oil (Oil-bath)	80000	min^-1	Oil-bath lubrication

Abutment and Fillet Dimensions

da (min.)	4	mm	Diameter of shaft abutment
Da (max.)	5.5	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

(approx.)

0.00025

Drawing for Reference

Designations	Basic Load Ratings		Radial Internal Clearance			Tolerance Class	Limiting Speeds		Number of Balls	Ball Diameter		Mass
Designations	C_r (N)	C_0r (N)		min	max	Tolerance Class	Grease (min^-1)	Oil (Oil-bath) (min^-1)	Number of Balls	(mm)	(inch)	(approx.) (kg)
R144	310	95					67000	80000	7	1	0.03937	0.00025

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

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.

More Information

More Information
NSK Product Type2	ESM_ID
NSK Product Type	Bearing
Designations	R144