Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71921 CD/P4AL

71921 CD/P4AL

Dimensions

d		105	mm
D		145	mm
B		20	mm
d₁		117.3	mm
d₂		117.3	mm
D₁		132.7	mm
b		2.3	mm
C₁		10.9	mm
C₂		3.9	mm
C₃		3.2	mm
r_1,2	min.	1.1	mm
r_3,4	min.	0.6	mm
a		26.8	mm

Abutment dimensions

d_a	min.	111	mm
d_b	min.	111	mm
D_a	max.	139	mm
D_b	max.	141	mm
r_a	max.	1	mm
r_b	max.	0.6	mm
d_n		120.6	mm

Calculation data

Basic dynamic load rating	C	61.8	kN
Basic static load rating	C₀	69.5	kN
Fatigue load limit	P_u	2.6	kN
Attainable speed for grease lubrication		8500	r/min
Attainable speed for oil-air lubrication		14000	r/min
Ball diameter	D_w	12.7	mm
Number of balls	z	27
Reference grease quantity	G_ref	11.1	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	230	N
Static axial stiffness, preload class A		110	N/µm
Preload class B	G_B	460	N
Static axial stiffness, preload class B		151	N/µm
Preload class C	G_C	920	N
Static axial stiffness, preload class C		215	N/µm
Preload class D	G_D	1840	N
Static axial stiffness, preload class D		316	N/µm
Calculation factors
Calculation factor	f	1.25
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.04
Calculation factor	f_2C	1.09
Calculation factor	f_2D	1.15
Calculation factor	f_HC	1
Calculation factor	f₀	16.4

Mass

Mass bearing

0.82

Model Number: 71921 CD/P4AL
Inner Diameter：105mm Outer Diameter：145mm Width：20mm
Reference speed:- Limiting speed:-
Type：Bearings, units and housings Super-precision bearings Angular contact ball bearings Angular contact ball bearings, super-precision
Details： Angular contact ball bearings, super-precision
Update date：2026-04-16
Application:medical equipment,tobacco machinery,universal category,bio-chemical,Infrared Technology,squeeze machine etc,marine analysis,wire industry,Cylinder Type,medical equipment,historical instruments
Similar models:71921 CD/HCP4A 71921 CD/HCP4AH1 S71921 ACD/HCP4A 71921 ACD/HCP4AL 71921 CD/P4AH1 71921 ACD/HCP4AH1 S71921 ACD/P4A S71921 CD/P4A 71921 CD/HCP4AL 71921 CD/P4AL
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Hot number： 1219 K + H 219 130x180x12 HMSA10 RG 1500510 22336 CCJA/W33VA405 55 VA R 590 VE R 61817 61864 MA 71938 ACD/HCP4A 72542 S7018 ACD/P4A SAF 23038 KA x 6.7/8 SAW 23536 x 6.1/2 T SILKAC 25 M T3FE 075