SKF 7218 CD/P4A Angular contact ball bearings, super-precision

SKF 7218 CD/P4A 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		90	mm
D		160	mm
B		30	mm
d1		111.6	mm
d2		111.6	mm
D1		138.4	mm
r1,2	min.	2	mm
r3,4	min.	1	mm
a		31.9	mm

Abutment dimensions

da	min.	101	mm
db	min.	101	mm
Da	max.	149	mm
Db	max.	154.4	mm
ra	max.	2	mm
rb	max.	1	mm
dn		117.5	mm

Calculation data

Basic dynamic load rating	C		127	kN
Basic static load rating	C0		112	kN
Fatigue load limit	Pu		4.25	kN
Attainable speed for grease lubrication			8500	r/min
Attainable speed for oil-air lubrication			14000	r/min
Ball diameter	Dw		22.225	mm
Number of balls	z		16
Reference grease quantity	Gref		27.765	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		480	N
Static axial stiffness, preload class A			114	N/µm
Preload class B	GB		960	N
Static axial stiffness, preload class B			154	N/µm
Preload class C	GC		1920	N
Static axial stiffness, preload class C			215	N/µm
Preload class D	GD		3840	N
Static axial stiffness, preload class D			314	N/µm
Calculation factors
Calculation factor	f		1.09
Calculation factor	f1		1
Calculation factor	f2A		1
Calculation factor	f2B		1.01
Calculation factor	f2C		1.03
Calculation factor	f2D		1.05
Calculation factor	fHC		1
Calculation factor	f0		14.6

Mass

Mass bearing

2.27

kg

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