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Bearing 7228 CD/P4A (SKF)

Angular contact ball bearings, super-precision 7228 CD/P4A

Bearing number : 7228 CD/P4A

Size (mm) : 140x250x42

Brand : SKF

Bore Diameter (mm) : 140

Outer Diameter (mm) : 250

Width (mm) : 42

Bearing dimensions and specification in SKF catalogue:

d - 140 mm

D - 250 mm

B - 42 mm

d₁ - 176.8 mm

d₂ - 176.8 mm

D₁ - 213.2 mm

r_1,2 - min. - 3 mm

r_3,4 - min. - 1.5 mm

a - 47.3 mm

d_a - min. - 154 mm

d_b - min. - 154 mm

D_a - max. - 236 mm

D_b - max. - 241 mm

r_a - max. - 2.5 mm

r_b - max. - 1.5 mm

d_n - 184.8 mm

Basic dynamic load rating - C - 221 kN

Basic static load rating - C₀ - 240 kN

Fatigue load limit - P_u - 7.4 kN

Limiting speed for grease lubrication - 5600 r/min

Limiting speed for oil lubrication - 8500 mm/min

Ball - D_w - 30.162 mm

Ball - z - 18

G_ref - 83.931 cm3

Calculation factor - f₀ - 15.2

Preload class A - G_A - 850 N

Preload class B - G_B - 1700 N

Preload class C - G_C - 3400 N

Preload class D - G_D - 6800 N

Calculation factor - f - 1.09

Calculation factor - f₁ - 1

Calculation factor - f_2A - 1

Calculation factor - f_2B - 1.01

Calculation factor - f_2C - 1.03

Calculation factor - f_2D - 1.05

Calculation factor - f_HC - 1

Preload class A - 163 N/micron

Preload class B - 220 N/micron

Preload class C - 305 N/micron

Preload class D - 437 N/micron

Mass bearing - 8.138 kg

Tags :  SKF , 140x250x42