Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71948 CD/HCP4A

71948 CD/HCP4A

Dimensions

d		240	mm
D		320	mm
B		38	mm
d₁		264.7	mm
d₂		264.7	mm
D₁		295.3	mm
r_1,2	min.	2.1	mm
r_3,4	min.	1	mm
a		56.6	mm

Abutment dimensions

d_a	min.	251	mm
d_b	min.	251	mm
D_a	max.	309	mm
D_b	max.	315	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		271.4	mm

Calculation data

Basic dynamic load rating	C	229	kN
Basic static load rating	C₀	325	kN
Fatigue load limit	P_u	8.15	kN
Attainable speed for grease lubrication		4800	r/min
Attainable speed for oil-air lubrication		6700	r/min
Ball diameter	D_w	25.4	mm
Number of balls	z	31
Reference grease quantity	G_ref	93	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	860	N
Static axial stiffness, preload class A		263	N/µm
Preload class B	G_B	1720	N
Static axial stiffness, preload class B		361	N/µm
Preload class C	G_C	3440	N
Static axial stiffness, preload class C		512	N/µm
Preload class D	G_D	6880	N
Static axial stiffness, preload class D		752	N/µm
Calculation factors
Calculation factor	f	1.32
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.07
Calculation factor	f_2C	1.12
Calculation factor	f_2D	1.18
Calculation factor	f_HC	1.04
Calculation factor	f₀	16.7

Mass

Mass bearing

5.98

Model Number: 71948 CD/HCP4A
Inner Diameter：240mm Outer Diameter：320mm Width：38mm
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：2026-04-17
Application:vertical pull,miscellaneous instruments,noise reduction equipment,Hydraulic Hose,tooth filling,electrostatic protection,sawing machine,coal mill,chamfering machine etc,marine test,Cylinder Micro
Similar models:71948 CD/P4A 71948 ACD/P4A 71948 CD/HCP4AL 71948 CD/P4AL 71948 ACD/HCP4A 71948 ACD/HCP4AL 71948 CD/HCP4A 71948 ACD/P4AL
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