SKF 71918 ACB/P4AL Angular contact ball bearings, super-precision

SKF 71918 ACB/P4AL 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		125	mm
B		18	mm
d1		103	mm
d2		101.4	mm
D2		115	mm
b		2.2	mm
C1		9.3	mm
C2		4.5	mm
C3		2.9	mm
r1,2	min.	1.1	mm
r3,4	min.	0.6	mm
a		39	mm

Abutment dimensions

da	min.	96	mm
db	min.	96	mm
Da	max.	119	mm
Db	max.	121.8	mm
ra	max.	1	mm
rb	max.	0.6	mm
dn		103.9	mm

Calculation data

Basic dynamic load rating	C		22.5	kN
Basic static load rating	C0		26.5	kN
Fatigue load limit	Pu		0.68	kN
Attainable speed for grease lubrication			12000	r/min
Attainable speed for oil-air lubrication			19000	r/min
Ball diameter	Dw		7.144	mm
Number of balls	z		36
Reference grease quantity	Gref		7.37	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		100	N
Static axial stiffness, preload class A			139	N/µm
Preload class B	GB		200	N
Static axial stiffness, preload class B			178	N/µm
Preload class C	GC		600	N
Static axial stiffness, preload class C			270	N/µm
Calculation factors
Calculation factor	f		1.12
Calculation factor	f1		0.99
Calculation factor	f2A		1
Calculation factor	f2B		1.02
Calculation factor	f2C		1.07
Calculation factor	fHC		1
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

0.59

kg

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