SKF 7028 ACD/HCP4AL Angular contact ball bearings, super-precision

SKF 7028 ACD/HCP4AL 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		140	mm
D		210	mm
B		33	mm
d1		161.6	mm
d2		161.6	mm
D1		188.4	mm
b		3.1	mm
C1		17.9	mm
C2		6.6	mm
C3		5.6	mm
r1,2	min.	2	mm
r3,4	min.	1	mm
a		57.5	mm

Abutment dimensions

da	min.	149	mm
db	min.	149	mm
Da	max.	201	mm
Db	max.	205	mm
ra	max.	2	mm
rb	max.	1	mm
dn		166.3	mm

Calculation data

Basic dynamic load rating	C		146	kN
Basic static load rating	C0		156	kN
Fatigue load limit	Pu		5.1	kN
Attainable speed for grease lubrication			7000	r/min
Attainable speed for oil-air lubrication			11000	r/min
Ball diameter	Dw		22.225	mm
Number of balls	z		22
Reference grease quantity	Gref		45	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		900	N
Static axial stiffness, preload class A			404	N/µm
Preload class B	GB		1800	N
Static axial stiffness, preload class B			530	N/µm
Preload class C	GC		3600	N
Static axial stiffness, preload class C			702	N/µm
Preload class D	GD		7200	N
Static axial stiffness, preload class D			950	N/µm
Calculation factors
Calculation factor	f		1.16
Calculation factor	f1		0.99
Calculation factor	f2A		1
Calculation factor	f2B		1.02
Calculation factor	f2C		1.05
Calculation factor	f2D		1.08
Calculation factor	fHC		1.02
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

2.83

kg

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