SKF 71921ACD/HCP4AH1 Angular contact ball bearings,SKF 71921 ACD/HCP4AH1 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/HCP4AH1

71921 ACD/HCP4AH1

Dimensions
d 105mm
D 145mm
B 20mm
d1 117.3mm
d2 117.3mm
D1 132.7mm
K 0.5mm
C1 5.46mm
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  9000r/min
Attainable speed for oil-air lubrication  15000r/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  292N/µm
Preload class BGB 720N
Static axial stiffness, preload class B  384N/µm
Preload class CGC 1440N
Static axial stiffness, preload class C  514N/µm
Preload class DGD 2880N
Static axial stiffness, preload class D  703N/µm
Calculation factors
Calculation factorf 1.25 
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  0.7kg
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Hot number: 17053 213-Z 24034 CCK30/W33 25x35x7 HMSA10 V 403753 740 VE R EE 649240/649310 FYK 40 LD GS 81113 H 311 E IR 100x110x40 L 45449/410 NNTR 130x310x146.2ZL NU 1012 ML/C3VL0241 Z 010 F

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