SKF 7208 ACD/HCP4A Angular Contact Ball Bearing

Details

Technical specification

DIMENSIONS

d		40 mm
D		80 mm
B		18 mm
d1		53.3 mm
d2		53.3 mm
D1		66.7 mm
r1,2		min. 1.1 mm
r3,4		min. 0.6 mm
a		23.1 mm

ABUTMENT DIMENSIONS

da		min. 47 mm
db		min. 47 mm
Da		max. 73 mm
Db		max. 75.8 mm
ra		max. 1 mm
rb		max. 0.6 mm
dn		56.2 mm

CALCULATION DATA

Basic dynamic load rating	C	31.9 kN
Basic static load rating	C0	22.8 kN
Fatigue load limit	Pu	0.71 kN
Attainable speed for grease lubrication		19000 r/min
Attainable speed for oil-air lubrication		32000 r/min
Contact angle	?	25 °
Ball diameter	Dw	11.112 mm
Number of balls	z	14
Reference grease quantity	Gref	4.725 cm³

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

Preload class A	GA	200 N
Static axial stiffness, preload class A		141 N/µm
Preload class B	GB	400 N
Static axial stiffness, preload class B		183 N/µm
Preload class C	GC	800 N
Static axial stiffness, preload class C		242 N/µm
Preload class D	GD	1600 N
Static axial stiffness, preload class D		326 N/µm

CALCULATION FACTORS

Calculation factor	f	1.05
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		0.33 kg