SKF 728 ACD/HCP4A Angular Contact Ball Bearing

Details

Technical specification

DIMENSIONS

d		8 mm
D		24 mm
B		8 mm
d1		13.1 mm
d2		13.1 mm
D1		18.9 mm
r1,2		min. 0.3 mm
r3,4		min. 0.2 mm
a		7.8 mm

ABUTMENT DIMENSIONS

da		min. 10.4 mm
db		min. 10.4 mm
Da		max. 21.6 mm
Db		max. 22.2 mm
ra		max. 0.3 mm
rb		max. 0.2 mm
dn		14.3 mm

CALCULATION DATA

Basic dynamic load rating	C	3.58 kN
Basic static load rating	C0	1.34 kN
Fatigue load limit	Pu	0.04 kN
Attainable speed for grease lubrication		75000 r/min
Attainable speed for oil-air lubrication		120000 r/min
Contact angle	?	25 °
Ball diameter	Dw	4.762 mm
Number of balls	z	8
Reference grease quantity	Gref	0.228 cm³

PRELOAD AND STIFFNESS (BACK-TO-BACK, FACE-TO-FACE)

Preload class A	GA	22 N
Static axial stiffness, preload class A		31 N/µm
Preload class B	GB	44 N
Static axial stiffness, preload class B		40 N/µm
Preload class C	GC	88 N
Static axial stiffness, preload class C		53 N/µm
Preload class D	GD	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	f2A	1
Calculation factor	f2B	1.01
Calculation factor	f2C	1.03
Calculation factor	f2D	1.06
Calculation factor	fHC	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 kg