Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 728 ACD/HCP4A

728 ACD/HCP4A

Dimensions

d		8	mm
D		24	mm
B		8	mm
d₁		13.1	mm
d₂		13.1	mm
D₁		18.9	mm
r_1,2	min.	0.3	mm
r_3,4	min.	0.2	mm
a		7.8	mm

Abutment dimensions

d_a	min.	10.4	mm
d_b	min.	10.4	mm
D_a	max.	21.6	mm
D_b	max.	22.2	mm
r_a	max.	0.3	mm
r_b	max.	0.2	mm
d_n		14.3	mm

Calculation data

Basic dynamic load rating	C	3.58	kN
Basic static load rating	C₀	1.34	kN
Fatigue load limit	P_u	0.057	kN
Attainable speed for grease lubrication		75000	r/min
Attainable speed for oil-air lubrication		120000	r/min
Ball diameter	D_w	4.762	mm
Number of balls	z	8
Reference grease quantity	G_ref	0.228	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	22	N
Static axial stiffness, preload class A		31	N/µm
Preload class B	G_B	44	N
Static axial stiffness, preload class B		40	N/µm
Preload class C	G_C	88	N
Static axial stiffness, preload class C		53	N/µm
Preload class D	G_D	176	N
Static axial stiffness, preload class D		70	N/µm
Calculation factors
Calculation factor	f	1.02
Calculation factor	f₁	0.99
Calculation factor	f_2A	1
Calculation factor	f_2B	1.01
Calculation factor	f_2C	1.03
Calculation factor	f_2D	1.06
Calculation factor	f_HC	1.01
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

0.015

Model Number: 728 ACD/HCP4A
Inner Diameter：8mm Outer Diameter：24mm Width：8mm
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:electromagnetic clutch,decoration machinery,reinforced machinery,Medium and large motor,intermediate,Other machinery,Control,transistor fittings,industry test,survey accessories,medical equipment
Similar models:7280 BM 728 ACD/P4A 306728 728 CD/P4A 728 ACD/HCP4A 728 CD/HCP4A
BEARING POWER International Trading Co.,Ltd. specialize in 728ACD/HCP4A products，there is large inventory of SKF 728 ACD/HCP4A Angular contact ball bearings, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the 728 ACD/HCP4A Which SKF 728ACD/HCP4A is the most authentic, must choose BEARING POWER, what a whole variety, reasonable price, guaranteed quality, prompt delivery via Global express. Any inquiry, never hesitate to E-mail or call +86-022-58519721 to contact us.

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