SKF 7009 ACE/HCP4A Angular contact ball bearings, super-precision

SKF 7009 ACE/HCP4A Angular contact ball bearings, super-precision
Angular contact ball bearings, super-precision

Tolerances: P4A, P4, PA9A, P2, Chamfer dimensionsRecommended shaft and housing fits: shafts, housingsValues for ISO tolerance classes: shafts, housingsSpeed dependent initial grease fill →Initial grease fillClamping and fitting forces: D design, E design, B design

Designation suffixes H, H1, L and L1identify variants for direct oil-air lubrication(→Variants).

d		45	mm
D		75	mm
B		16	mm
d1		55.7	mm
d2		53.6	mm
D1		64.25	mm
r1,2	min.	1	mm
r3,4	min.	0.6	mm
a		22.2	mm

Abutment dimensions

da	min.	49.6	mm
db	min.	49.6	mm
Da	max.	70.4	mm
Db	max.	70.8	mm
ra	max.	1	mm
rb	max.	0.6	mm
dn		57.6	mm

Calculation data

Basic dynamic load rating	C		12.1	kN
Basic static load rating	C0		8.15	kN
Fatigue load limit	Pu		0.345	kN
Attainable speed for grease lubrication			29000	r/min
Attainable speed for oil-air lubrication			45000	r/min
Ball diameter	Dw		7.144	mm
Number of balls	z		21
Reference grease quantity	Gref		3.4	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		110	N
Static axial stiffness, preload class A			104	N/µm
Preload class B	GB		330	N
Static axial stiffness, preload class B			156	N/µm
Preload class C	GC		660	N
Static axial stiffness, preload class C			204	N/µm
Calculation factors
Calculation factor	f		1.06
Calculation factor	f1		0.99
Calculation factor	f2A		1
Calculation factor	f2B		1.03
Calculation factor	f2C		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

0.22

kg

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