FOR REFERENCE ONLY
  • Deep groove ball bearings
  • Extra-small, miniature ball bearings
  • Standard type
  • Shielded ZZ
>

Bearing No. 638 ZZ

Specifications
(Boundary dimensions ...etc)

d(mm)8
D(mm)28
B(mm)9
r(min.)(mm)0.3
Basic load ratings : Cr(kN)5.65
Basic load ratings : C0r(kN)1.95
Fatigue load limit : Cu(kN)0.100
factor : f0()12.3
Limiting speeds(Grease lub.)(min-1)26000
Limiting speeds(Oil lub.)(min-1)-

Mounting dimensions

da(min.)(mm)10
Da(max.)(mm)26
ra(max.)(mm)0.3

Refer.

(Refer.)Mass(g) 29
JTEKT

2025/06/11