SKF 71928 CD/P4AH1 Angular contact ball bearings, super-precision

SKF 71928 CD/P4AH1 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		190	mm
B		24	mm
d1		155.4	mm
d2		155.4	mm
D1		174.6	mm
K		0.5	mm
C1		6.92	mm
r1,2	min.	1.5	mm
r3,4	min.	0.6	mm
a		34.2	mm

Abutment dimensions

da	min.	147	mm
db	min.	147	mm
Da	max.	183	mm
Db	max.	186	mm
ra	max.	1.5	mm
rb	max.	0.6	mm
dn		159.5	mm

Calculation data

Basic dynamic load rating	C		95.6	kN
Basic static load rating	C0		116	kN
Fatigue load limit	Pu		3.9	kN
Attainable speed for grease lubrication			6700	r/min
Attainable speed for oil-air lubrication			10000	r/min
Ball diameter	Dw		15.875	mm
Number of balls	z		29
Reference grease quantity	Gref		21.6	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		360	N
Static axial stiffness, preload class A			146	N/µm
Preload class B	GB		720	N
Static axial stiffness, preload class B			201	N/µm
Preload class C	GC		1440	N
Static axial stiffness, preload class C			286	N/µm
Preload class D	GD		2880	N
Static axial stiffness, preload class D			420	N/µm
Calculation factors
Calculation factor	f		1.29
Calculation factor	f1		1
Calculation factor	f2A		1
Calculation factor	f2B		1.04
Calculation factor	f2C		1.09
Calculation factor	f2D		1.15
Calculation factor	fHC		1
Calculation factor	f0		16.6

Mass

Mass bearing

1.65

kg

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