SKF 71921ACD/P4A Angular contact ball bearings,SKF 71921 ACD/P4A Super-precision bearings-BEARINGPOWER Co.,Ltd.
Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71921 ACD/P4A

71921 ACD/P4A

Dimensions
d 105mm
D 145mm
B 20mm
d1 117.3mm
d2 117.3mm
D1 132.7mm
r1,2min.1.1mm
r3,4min.0.6mm
a 39.3mm
Abutment dimensions
damin.111mm
dbmin.111mm
Damax.139mm
Dbmax.141mm
ramax.1mm
rbmax.0.6mm
dn 120.6mm
Calculation data
Basic dynamic load ratingC 57.2kN
Basic static load ratingC0 65.5kN
Fatigue load limitPu 2.5kN
Attainable speed for grease lubrication  7500r/min
Attainable speed for oil-air lubrication  12000r/min
Ball diameterDw 12.7mm
Number of ballsz 27 
Reference grease quantityGref 11.1cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 360N
Static axial stiffness, preload class A  263N/µm
Preload class BGB 720N
Static axial stiffness, preload class B  346N/µm
Preload class CGC 1440N
Static axial stiffness, preload class C  463N/µm
Preload class DGD 2880N
Static axial stiffness, preload class D  633N/µm
Calculation factors
Calculation factorf 1.25 
Calculation factorf1 0.98 
Calculation factorf2A 1 
Calculation factorf2B 1.04 
Calculation factorf2C 1.08 
Calculation factorf2D 1.14 
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  0.82kg
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Hot number: 1222 K + H 222 145x180x12 HMSA10 V 19940 24160 CC/W33 7011 ACE/HCP4A 6415 7305 ACCBM BT4B 331372/HA4 BTM 170 AM/HCP4CDB C 39/1060 KMB G 4x8x2 S PPMF 252811.5 SAFS 22217 T SNL 3268 SY 1.3/16 FM

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