SKF 7020 CE/P4AL1 Angular contact ball bearings, super-precision

SKF 7020 CE/P4AL1 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		100	mm
D		150	mm
B		24	mm
d1		117.38	mm
d2		114.2	mm
D1		132.61	mm
b		1.8	mm
C1		7.1	mm
C2		4	mm
C3		4	mm
r1,2	min.	1.5	mm
r3,4	min.	1	mm
a		28.9	mm

Abutment dimensions

da	min.	107	mm
db	min.	107	mm
Da	max.	143	mm
Db	max.	144.4	mm
ra	max.	1.5	mm
rb	max.	1	mm
dn		120.4	mm

Calculation data

Basic dynamic load rating	C		44.9	kN
Basic static load rating	C0		40	kN
Fatigue load limit	Pu		1.5	kN
Attainable speed for grease lubrication			12300	r/min
Attainable speed for oil-air lubrication			19000	r/min
Ball diameter	Dw		12.7	mm
Number of balls	z		27
Reference grease quantity	Gref		17	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		240	N
Static axial stiffness, preload class A			88	N/µm
Preload class B	GB		720	N
Static axial stiffness, preload class B			138	N/µm
Preload class C	GC		1440	N
Static axial stiffness, preload class C			191	N/µm
Calculation factors
Calculation factor	f		1.12
Calculation factor	f1		1
Calculation factor	f2A		1
Calculation factor	f2B		1.03
Calculation factor	f2C		1.05
Calculation factor	fHC		1
Calculation factor	f0		9.5

Mass

Mass bearing

1.26

kg

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