681X Series

Extra Small Ball Bearings and Miniature Ball Bearings Metric Series

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Radial Internal Clearance

Tolerance

Grouped product items
Parts Number
681XMC3 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.
681XMC3P5 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.
681XMC3P6 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.
681XMC5 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.
681XMC5P5 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.
681XMC5P6 Extra Small Ball Bearings and Miniature Ball Bearings Metric Series			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

681X

Boundary Dimensions

d	1.5	mm	Bore diameter
D	4	mm	Outside diameter
B	1.2	mm	Width
r (min.)	0.05	mm	Chamfer dimension

Basic Load Ratings

C_r	124	N	Basic dynamic load rating
C_0r	33	N	Basic static load rating

Speeds

Grease	100000	min^-1	Grease lubrication
Oil (Oil-bath)	120000	min^-1	Oil-bath lubrication

Abutment and Fillet Dimensions

da (min.)	1.9	mm	Diameter of shaft abutment
Da (max.)	3.6	mm	Diameter of housing abutment
ra (max.)	0.05	mm	Radius of shaft or housing fillet

Additional information

z	7		Number of Balls
Dw	0.6	mm	Ball Diameter

Mass

(approx.)

0.00007

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)
681X	124	33					100000	120000	7	0.6	0.023622	0.00007

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Not to scale.
(*) The chamfer dimensions are minimum values.
684A, 684AZZ1, 629, 629ZZ, 629XX, 629DD : Chamfer dimensions are not based on ISO 15.

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_MD
NSK Product Type	Bearing
Designations	681X