Bearing 638/4-2Z (SKF)

Deep groove ball bearings, single row 638/4-2Z

Bearing number : 638/4-2Z

Size (mm) : 4x9x4

Brand : SKF

Bore Diameter (mm) : 4

Outer Diameter (mm) : 9

Width (mm) : 4

Bearing dimensions and specification in SKF catalogue:

d - 4 mm

D - 9 mm

B - 4 mm

d₁ - - 5.2 mm

D₂ - - 8.1 mm

r_1,2 - min. - 0.1 mm

d_a - min. - 4.6 mm

d_a - max. - 5.1 mm

D_a - max. - 8.4 mm

r_a - max. - 0.1 mm

Basic dynamic load rating - C - 0.54 kN

Basic static load rating - C₀ - 0.18 kN

Fatigue load limit - P_u - 0.07 kN

Reference speed - 140000 r/min

Limiting speed - 70000 r/min

Calculation factor - k_r - 0.015

Calculation factor - f₀ - 10

Mass bearing - 0.0013 kg

Tags : SKF , 4x9x4

Designation

Bore Dia, mm

Outer Dia, mm: