Angular contact ball bearings, super-precision

Tolerances: P4A, P4B, P4, PA9A, P2, Chamfer dimensions
Recommended shaft and housing fits: shafts, housings
Values for ISO tolerance classes: shafts, housings
Speed dependent initial grease fill → Initial grease fill
Clamping and fitting forces: D design, E design, B design
Designation suffixes H, H1, L and L1
identify variants for direct oil-air lubrication
(→ Variants).

Calculation

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71903 ACD/HCP4A

Dimensions
d 17mm
D 30mm
B 7mm
d1 20.9mm
d2 20.9mm
D1 25.7mm
r1,2min.0.3mm
r3,4min.0.2mm
a 9mm
Abutment dimensions
damin.19mm
dbmin.19mm
Damax.28mm
Dbmax.28.6mm
ramax.0.3mm
rbmax.0.2mm
dn 22.1mm
Calculation data
Basic dynamic load ratingC 3.97kN
Basic static load ratingC0 2kN
Fatigue load limitPu 0.062kN
Attainable speed for grease lubrication  56000r/min
Attainable speed for oil-air lubrication  90000r/min
Contact angleα 25°
Ball diameterDw 3.969mm
Number of ballsz 14 
Reference grease quantityGref 0.24cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 25N
Static axial stiffness, preload class A  46N/µm
Preload class BGB 50N
Static axial stiffness, preload class B  60N/µm
Preload class CGC 100N
Static axial stiffness, preload class C  78N/µm
Preload class DGD 200N
Static axial stiffness, preload class D  103N/µm
Calculation factors
Calculation factorf 1.05 
Calculation factorf1 0.98 
Calculation factorf2A 1 
Calculation factorf2B 1.07 
Calculation factorf2C 1.12 
Calculation factorf2D 1.17 
Calculation factorfHC 1.04 
Calculation factore 0.68 
Calculation factor (single, tandem)Y2 0.87 
Calculation factor (single, tandem)Y0 0.38 
Calculation factor (single, tandem)X2 0.41 
Calculation factor (back-to-back, face-to-face)Y1 0.92 
Calculation factor (back-to-back, face-to-face)Y2 1.41 
Calculation factor (back-to-back, face-to-face)Y0 0.76 
Calculation factor (back-to-back, face-to-face)X2 0.67 
Mass
Mass bearing  0.015kg

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