Angular contact ball bearings, super-precision 71905 ACD/HCP4A
Bearing number : 71905 ACD/HCP4A
Size (mm) : 25x42x9
Brand : SKF
Bore Diameter (mm) : 25
Outer Diameter (mm) : 42
Width (mm) : 9
Bearing dimensions and specification in SKF catalogue:
d - 25 mm
D - 42 mm
B - 9 mm
d1 - 30.6 mm
d2 - 30.6 mm
D1 - 36.4 mm
r1,2 - min. - 0.3 mm
r3,4 - min. - 0.2 mm
a - 12.4 mm
da - min. - 27 mm
db - min. - 27 mm
Da - max. - 40 mm
Db - max. - 40.6 mm
ra - max. - 0.3 mm
rb - max. - 0.2 mm
dn - 31.8 mm
Basic dynamic load rating - C - 6.4 kN
Basic static load rating - C0 - 3.8 kN
Fatigue load limit - Pu - 0.16 kN
Limiting speed for grease lubrication - 38000 r/min
Limiting speed for oil lubrication - 56000 mm/min
Ball - Dw - 4.762 mm
Ball - z - 18
Gref - 0.54 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 - GA - 40 N
Preload class B - GB - 80 N
Preload class C - GC - 160 N
Preload class D - GD - 320 N
Calculation factor - f - 1.07
Calculation factor - f1 - 0.98
Calculation factor - f2A - 1
Calculation factor - f2B - 1.07
Calculation factor - f2C - 1.12
Calculation factor - f2D - 1.17
Calculation factor - fHC - 1.04
Preload class A - 66 N/micron
Preload class B - 86 N/micron
Preload class C - 112 N/micron
Preload class D - 149 N/micron
Mass bearing - 0.039 kg
SKF Bearings - Bearing Parts & Supplies - Grainger .
Ball bearings are used with applications that have high axial loads and low-to-moderate radial loads. Mounted bearings (bearing units) have a bearing inside a housing unit to ensure a secure fit and mount. Sleeve and clip bearings support high loads, have no moving parts, and require lubricant to allow the shaft to turn smoothly.
SKF | Bearings, Units and Housings, Ball Bearin
SKF. Chances are you know SKF for the bearings that keep your equipment running smoothly and efficiently. And with good reason: SKF bearings set the world standard for quality and reliability and are original equipment components in industrial machinery of every kind – motors, pumps, fans, gearboxes, conveyors, machine tool spindles and more.
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real SKF bearing – but your machine will! Fig. 1 Fig. 2 Fig. 3 Fig. 1. Fresh out of “production line” the Fig. 4 counterfeit bearings looks good on the surface. Fig. 2 and 3. The photos shows the condition of a counterfeit bearing used for less than 40 hours in a crusher application. A second bearing was just in black pieces. Fig. 4.
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WBA is a non-profit and unincorporated industrial association. It was founded in 2006 by three major, regional bearing associations: The American Bearing Manufacturers Association (ABMA), the Federation of European Bearing Manufacturers' Associations (FEBMA) and the Japan Bearing Industry Association (JBIA).
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