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Bearing 71904 ACD/P4A (SKF)

Angular contact ball bearings, super-precision 71904 ACD/P4A

Bearing number : 71904 ACD/P4A

Size (mm) : 20x37x9

Brand : SKF

Bore Diameter (mm) : 20

Outer Diameter (mm) : 37

Width (mm) : 9

Bearing dimensions and specification in SKF catalogue:

d - 20 mm

D - 37 mm

B - 9 mm

d₁ - 25.6 mm

d₂ - 25.6 mm

D₁ - 31.4 mm

r_1,2 - min. - 0.3 mm

r_3,4 - min. - 0.2 mm

a - 11.2 mm

d_a - min. - 22 mm

d_b - min. - 22 mm

D_a - max. - 35 mm

D_b - max. - 35.6 mm

r_a - max. - 0.3 mm

r_b - max. - 0.2 mm

d_n - 26.8 mm

Basic dynamic load rating - C - 5.7 kN

Basic static load rating - C₀ - 3 kN

Fatigue load limit - P_u - 0.129 kN

Limiting speed for grease lubrication - 38000 r/min

Limiting speed for oil lubrication - 56000 mm/min

Ball - D_w - 4.762 mm

Ball - z - 15

G_ref - 0.45 cm3

Calculation factor - e - 0.68

Calculation factor - Y₂ - 0.87

Calculation factor - Y₀ - 0.38

Calculation factor - X₂ - 0.41

Calculation factor - Y₁ - 0.92

Calculation factor - Y₂ - 1.41

Calculation factor - Y₀ - 0.76

Calculation factor - X₂ - 0.67

Preload class A - G_A - 35 N

Preload class B - G_B - 70 N

Preload class C - G_C - 140 N

Preload class D - G_D - 280 N

Calculation factor - f - 1.05

Calculation factor - f₁ - 0.98

Calculation factor - f_2A - 1

Calculation factor - f_2B - 1.04

Calculation factor - f_2C - 1.08

Calculation factor - f_2D - 1.14

Calculation factor - f_HC - 1

Preload class A - 51 N/micron

Preload class B - 65 N/micron

Preload class C - 85 N/micron

Preload class D - 113 N/micron

Mass bearing - 0.035 kg

Tags :  SKF , 20x37x9