SKF 7018 ACE/HCP4A Angular contact ball bearings, super-precision

SKF 7018 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		90	mm
D		140	mm
B		24	mm
d1		108.33	mm
d2		105.5	mm
D1		121.66	mm
r1,2	min.	1.5	mm
r3,4	min.	1	mm
a		39	mm

Abutment dimensions

da	min.	97	mm
db	min.	97	mm
Da	max.	133	mm
Db	max.	134.4	mm
ra	max.	1.5	mm
rb	max.	1	mm
dn		111	mm

Calculation data

Basic dynamic load rating	C		33.8	kN
Basic static load rating	C0		30	kN
Fatigue load limit	Pu		1.2	kN
Attainable speed for grease lubrication			14000	r/min
Attainable speed for oil-air lubrication			22000	r/min
Ball diameter	Dw		11.112	mm
Number of balls	z		28
Reference grease quantity	Gref		14	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		300	N
Static axial stiffness, preload class A			218	N/µm
Preload class B	GB		920	N
Static axial stiffness, preload class B			329	N/µm
Preload class C	GC		1840	N
Static axial stiffness, preload class C			432	N/µm
Calculation factors
Calculation factor	f		1.1
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

1.11

kg

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