Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 708 ACD/HCP4A

708 ACD/HCP4A

Dimensions

d		8	mm
D		22	mm
B		7	mm
d₁		12.6	mm
d₂		12.6	mm
D₁		17.4	mm
r_1,2	min.	0.3	mm
r_3,4	min.	0.2	mm
a		7	mm

Abutment dimensions

d_a	min.	10	mm
d_b	min.	10	mm
D_a	max.	20	mm
D_b	max.	20.6	mm
r_a	max.	0.3	mm
r_b	max.	0.2	mm
d_n		13.6	mm

Calculation data

Basic dynamic load rating	C	3.19	kN
Basic static load rating	C₀	1.34	kN
Fatigue load limit	P_u	0.056	kN
Attainable speed for grease lubrication		95000	r/min
Attainable speed for oil-air lubrication		150000	r/min
Ball diameter	D_w	3.969	mm
Number of balls	z	9
Reference grease quantity	G_ref	0.15	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	20	N
Static axial stiffness, preload class A		32	N/µm
Preload class B	G_B	40	N
Static axial stiffness, preload class B		41	N/µm
Preload class C	G_C	80	N
Static axial stiffness, preload class C		53	N/µm
Preload class D	G_D	160	N
Static axial stiffness, preload class D		71	N/µm
Calculation factors
Calculation factor	f	1.02
Calculation factor	f₁	0.99
Calculation factor	f_2A	1
Calculation factor	f_2B	1.02
Calculation factor	f_2C	1.05
Calculation factor	f_2D	1.08
Calculation factor	f_HC	1.02
Calculation factor	e	0.68
Calculation factor (single, tandem)	Y₂	0.87
Calculation factor (single, tandem)	Y₀	0.38
Calculation factor (single, tandem)	X₂	0.41
Calculation factor (back-to-back, face-to-face)	Y₁	0.92
Calculation factor (back-to-back, face-to-face)	Y₂	1.41
Calculation factor (back-to-back, face-to-face)	Y₀	0.76
Calculation factor (back-to-back, face-to-face)	X₂	0.67

Mass

Mass bearing

0.011

Model Number: 708 ACD/HCP4A
Inner Diameter：8mm Outer Diameter：22mm Width：7mm
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:Infrared Technology,thin metal materials,orthodontic material,Water Monitoring,hydraulic pressure gauge,turret industry,car,printing equipment,plant determination,beverage production,Vertical machining
Similar models:WBB1-8708-2RZ 70892 AM WBB1-8708 R-2RS1 708 ACD/P4A 708 ACD/HCP4A 708/500 AMB 708 CD/HCP4AH PSMF 708560 A51 708 CE/HCP4A 7080 BM
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Hot number： 20538 315973 54971 61815-2RS1 6317-Z 7012 ACE/HCP4AL 7212 BEP FYNT 100 L GB 1010 GS 81105 HA 2328 IR 15x20x13 K 20x28x16 KD2-103 PCZ 2420 E