SKF 71920 ACE/HCP4AL Angular contact ball bearings, super-precision

SKF 71920 ACE/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		100	mm
D		140	mm
B		20	mm
d1		112.4	mm
d2		109	mm
D1		127.51	mm
b		2.3	mm
C1		10.9	mm
C2		3	mm
C3		3.3	mm
r1,2	min.	1.1	mm
r3,4	min.	0.6	mm
a		39.2	mm

Abutment dimensions

da	min.	106	mm
db	min.	103.2	mm
Da	max.	134	mm
Db	max.	136.8	mm
ra	max.	1	mm
rb	max.	0.6	mm
dn		115.4	mm

Calculation data

Basic dynamic load rating	C		36.4	kN
Basic static load rating	C0		30	kN
Fatigue load limit	Pu		1.14	kN
Attainable speed for grease lubrication			13700	r/min
Attainable speed for oil-air lubrication			22000	r/min
Ball diameter	Dw		12.7	mm
Number of balls	z		24
Reference grease quantity	Gref		10	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		332	N
Static axial stiffness, preload class A			207	N/µm
Preload class B	GB		996	N
Static axial stiffness, preload class B			311	N/µm
Preload class C	GC		1990	N
Static axial stiffness, preload class C			408	N/µm
Calculation factors
Calculation factor	f		1.18
Calculation factor	f1		0.98
Calculation factor	f2A		1
Calculation factor	f2B		1.04
Calculation factor	f2C		1.08
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

0.65

kg

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