Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71920 CB/P4A

71920 CB/P4A

Dimensions

d		100	mm
D		140	mm
B		20	mm
d₁		114.92	mm
d₂		113.16	mm
D₂		128.7	mm
r_1,2	min.	1.1	mm
r_3,4	min.	0.6	mm
a		28.9	mm

Abutment dimensions

d_a	min.	106	mm
d_b	min.	106	mm
D_a	max.	134	mm
D_b	max.	136.8	mm
r_a	max.	1	mm
r_b	max.	0.6	mm
d_n		116.1	mm

Calculation data

Basic dynamic load rating	C	29.1	kN
Basic static load rating	C₀	36	kN
Fatigue load limit	P_u	0.865	kN
Attainable speed for grease lubrication		12000	r/min
Attainable speed for oil-air lubrication		19000	r/min
Ball diameter	D_w	7.938	mm
Number of balls	z	37
Reference grease quantity	G_ref	9.96	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	72	N
Static axial stiffness, preload class A		60	N/µm
Preload class B	G_B	145	N
Static axial stiffness, preload class B		79	N/µm
Preload class C	G_C	430	N
Static axial stiffness, preload class C		125	N/µm
Calculation factors
Calculation factor	f	1.11
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.02
Calculation factor	f_2C	1.07
Calculation factor	f_HC	1
Calculation factor	f₀	10

Mass

Mass bearing

0.85

Model Number: 71920 CB/P4A
Inner Diameter：100mm Outer Diameter：140mm 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：2025-12-09
Application:Medical equipment,printing equipment,Ball screw,vertical pull,generator,beverage production,position switch,outdoor equipment,Anesthetic Equipment,water,economic mold
Similar models:71920 CD/P4A 71920 ACE/P4A 71920 ACE/HCP4A 71920 ACB/HCP4A 71920 ACE/HCP4AH1 71920 CB/P4AL S71920 CB/HCP4A 71920 ACE/P4AL 71920 CD/P4AH1 71920 ACD/HCP4A
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