Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71908 CD/HCP4A

71908 CD/HCP4A

Dimensions

d		40	mm
D		62	mm
B		12	mm
d₁		47.1	mm
d₂		47.1	mm
D₁		54.9	mm
r_1,2	min.	0.6	mm
r_3,4	min.	0.3	mm
a		12.9	mm

Abutment dimensions

d_a	min.	43.2	mm
d_b	min.	43.2	mm
D_a	max.	58.8	mm
D_b	max.	60.6	mm
r_a	max.	0.6	mm
r_b	max.	0.3	mm
d_n		48.7	mm

Calculation data

Basic dynamic load rating	C	12.4	kN
Basic static load rating	C₀	8.5	kN
Fatigue load limit	P_u	0.36	kN
Attainable speed for grease lubrication		28000	r/min
Attainable speed for oil-air lubrication		40000	r/min
Ball diameter	D_w	6.35	mm
Number of balls	z	21
Reference grease quantity	G_ref	1.44	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	45	N
Static axial stiffness, preload class A		40	N/µm
Preload class B	G_B	90	N
Static axial stiffness, preload class B		54	N/µm
Preload class C	G_C	180	N
Static axial stiffness, preload class C		73	N/µm
Preload class D	G_D	360	N
Static axial stiffness, preload class D		103	N/µm
Calculation factors
Calculation factor	f	1.09
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	10.4

Mass

Mass bearing

0.1

Model Number: 71908 CD/HCP4A
Inner Diameter：40mm Outer Diameter：62mm Width：12mm
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:set bacteria instrument,other processing,light therapy instrument,ignition system,PVC,mobile toilet,inorganic chemical,Control,powder metallurgy,power tools,steam Hydraulic control element
Similar models:71908 ACD/P4A S71908 ACE/HCP4A 71908 CB/HCP4A S71908 ACD/P4A 71908 ACE/P4A S71908 CD/P4A 71908 CD/HCP4A S71908 ACB/P4A 71908 ACB/HCP4AL S71908 CB/HCP4A
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