SKF 71808 ACD/HCP4 Angular Contact Ball Bearing

Details

Technical specification

DIMENSIONS

d		40 mm
D		52 mm
B		7 mm
d1		44.1 mm
d2		44.1 mm
D1		48.1 mm
r1,2		min. 0.3 mm
r3,4		min. 0.15 mm
a		14.3 mm

ABUTMENT DIMENSIONS

da		min. 42 mm
db		min. 42 mm
Da		max. 50 mm
Db		max. 51.2 mm
ra		max. 0.3 mm
rb		max. 0.15 mm
dn		44.5 mm

CALCULATION DATA

Basic dynamic load rating	C	4.49 kN
Basic static load rating	C0	4.55 kN
Fatigue load limit	Pu	0.143 kN
Attainable speed for grease lubrication		28000 r/min
Attainable speed for oil-air lubrication		43000 r/min
Contact angle	?	25 °
Ball diameter	Dw	3.175 mm
Number of balls	z	29
Reference grease quantity	Gref	0.31 cm³

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

Preload class A	GA	40 N
Static axial stiffness, preload class A		93 N/µm
Preload class B	GB	120 N
Static axial stiffness, preload class B		145 N/µm
Preload class C	GC	240 N
Static axial stiffness, preload class C		197 N/µm

CALCULATION FACTORS

Calculation factor	f	1.23
Calculation factor	f1	0.97
Calculation factor	f2A	1
Calculation factor	f2B	1.09
Calculation factor	f2C	1.17
Calculation factor	fHC	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		0.029 kg