638 miniature ball bearing
638 miniature ball bearing

Miniature bearing are simple in design, non-separable, suitable for high and even very high speeds and are robust in operation, requiring little maintenance.Deep-groove bearings have higher load ratings for their size than shallow-groove , but are also less tolerant of misalignment of the inner and outer races
Miniature bearing suitable for precision instrument, low noise electromotor, automobile and motorcycle, etc. It is the the most widely used bearing type.

Part Number 638 miniature ball bearing
Bore Dia (d) 8 mm
Outer Dia (D) 28mm
Width (B) 9mm
Bearing Type Shielded or Seal and Open are available.
Material 52100 Chrome steel, stainless steel and ceramic are available.
Dynamic Load Rating (Cr) (Newtons) 3879
Static Load Rating (Cor) (Newtons) 1586
Max Speed (Grease) (X1000 RPM) 28
Max Speed (Oil) (X1000 RPM) 34
Ball Qty 7
Ball Dia (Dw) 4.7620mm
Weight (g) (grams) 28.1
Note ABEC Grades 1, 3, 5, 7, and 9 are available. Also, the equivalent ISO classes.