Designation
With shiled :638
Open type :638ZZ1
With seal VV :638VV
With seal DD :638DD
Principal dimensions（mm）
d :8
D :28
B :9
B1 :9
r(min) :0.3
Basic load ratings(N)
Cr :4550
Cor :1970
Basic load ratings{kgf}
Cr :465
Cor :201
Speed ratings(rpm)
Grease
ZZ :28000
D·D :22000
Oil
Z :34000
Abutment and fillet dimensions (mm)
da(min) :10
db(max) :12.8
Da(Max) :26
Db(min) :22.8
ra(max) :0.3
rb(max) :0.3
Weight(g)
Open type :28.3
With shiled :28.6
