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Product Catalog

Deep Groove Ball Bearing

Inquiry

638-Z 638-2Z 638-RZ 638-2RZ 638-RS1 638-2RS1

Principal dimensions (mm)
  • d: 8
  • D: 28
  • B: 9
  • r 1,2 min: 0.3
Basic load ratings (kn)
  • Cr: 3.530
  • Cor: 1.940
Speed ratings(r/min)
  • Grease -2Z -2RZ: 26000
  • Grease -2RS1: 16000
  • Oil: 31000
Bearing No.
  • -Z: 638-Z
  • -2Z: 638-2Z
  • -RZ: 638-RZ
  • -2RZ: 638-2RZ
  • -RS1: 638-RS1
  • -2RS1: 638-2RS1
Fitting dimension (mm)
  • d a min: 10.6
  • D a max: 25.4
  • r a max: 0.3