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

71908 CB/HCP4A

Dimensions

d		40	mm
D		62	mm
B		12	mm
d₁		48.46	mm
d₂		47.6	mm
D₂		55.64	mm
r_1,2	min.	0.6	mm
r_3,4	min.	0.3	mm
a		14.8	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	mm
r_a	max.	0.6	mm
r_b	max.	0.3	mm
d_n		49.1	mm

Calculation data

Basic dynamic load rating	C	7.15	kN
Basic static load rating	C₀	6.95	kN
Fatigue load limit	P_u	0.176	kN
Attainable speed for grease lubrication		36000	r/min
Attainable speed for oil-air lubrication		56000	r/min
Ball diameter	D_w	3.969	mm
Number of balls	z	28
Reference grease quantity	G_ref	1.38	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	18	N
Static axial stiffness, preload class A		27	N/µm
Preload class B	G_B	36	N
Static axial stiffness, preload class B		36	N/µm
Preload class C	G_C	110	N
Static axial stiffness, preload class C		58	N/µm
Calculation factors
Calculation factor	f	1.06
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.03
Calculation factor	f_2C	1.08
Calculation factor	f_HC	1.01
Calculation factor	f₀	9.8

Mass

Mass bearing

0.11

Model Number: 71908 CB/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:horizontal processing,food packaging,rehabilitation training equipment,survey accessories,pump industry,light therapy instrument,medical Equipment,Display Devices,storage shelves,tapered grinder,other processing
Similar models:S71908 ACE/HCP4A 71908 ACB/HCP4AL 71908 ACE/P4AH1 71908 CB/HCP4A S71908 ACE/P4A S71908 ACD/HCP4A 71908 CE/HCP4A 71908 CD/HCP4A 71908 CB/HCP4AL 71908 CE/HCP4AH1
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