NSK 684A
Extra Small Ball Bearings and Miniature Ball Bearings Metric Series
(BRAND)：NSK
(Availability)：In Stock
(EMAIL)：info@noksbearings.com
Designations
684A
Boundary Dimensions
d
4
mm
Bore diameter
D
9
mm
Outside diameter
B
2.5
mm
Width
r (min.)
0.1
mm
Chamfer dimension
Basic Load Ratings
Cr
705
N
Basic dynamic load rating
C0r
225
N
Basic static load rating
Speeds
Grease
53000
min-1
Grease lubrication
Oil (Oil-bath)
63000
min-1
Oil-bath lubrication
da (min.)
4.8
mm
Diameter of shaft abutment
Da (max.)
8.2
mm
Diameter of housing abutment
ra (max.)
0.1
mm
Radius of shaft or housing fillet
Abutment and Fillet Dimensions
z
7
Number of Balls
Dw
1.588
mm
Ball Diameter
