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W 638/4-2Z/Deep groove ball bearing/

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Product model W 638/4-2Z
d 4 mm
D 9 mm
B 4 mm
Limiting speed 70000 r/min
d1 ≈5.2 mm
d2 ≈5.2 mm
D3 ≈8.1 mm
Da max.8.2 mm
Chamfer size (r1,2) min.0.1 mm
da min.4.8 mm/max.5.1 mm
ra max.0.1 mm
Pu 0.005 kN
Reference speed 140 000 r/min
kr 0.02
f0 6.5
Radial runout National Standard
Dimensional tolerance National Standard