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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7214 ACD/P4A

Dimensions
d 70mm
D 125mm
B 24mm
d1 87.9mm
d2 87.9mm
D1 107.1mm
r1,2min.1.5mm
r3,4min.0.6mm
a 34.9mm
Abutment dimensions
damin.79mm
dbmin.79mm
Damax.116mm
Dbmax.120.8mm
ramax.1.5mm
rbmax.0.6mm
dn 91.6mm
Calculation data
Basic dynamic load ratingC 66.3kN
Basic static load ratingC0 55kN
Fatigue load limitPu 2.36kN
Attainable speed for grease lubrication  9500r/min
Attainable speed for oil-air lubrication  16000r/min
Contact angleα 25°
Ball diameterDw 15.875mm
Number of ballsz 16 
Reference grease quantityGref 13.701cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 420N
Static axial stiffness, preload class A  201N/µm
Preload class BGB 840N
Static axial stiffness, preload class B  261N/µm
Preload class CGC 1680N
Static axial stiffness, preload class C  345N/µm
Preload class DGD 3360N
Static axial stiffness, preload class D  464N/µm
Calculation factors
Calculation factorf 1.08 
Calculation factorf1 0.99 
Calculation factorf2A 1 
Calculation factorf2B 1.01 
Calculation factorf2C 1.02 
Calculation factorf2D 1.05 
Calculation factorfHC 1 
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  1.11kg

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