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

SKF 71918 CD/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		100.8	mm
d2		100.8	mm
D1		114.2	mm
b		2.6	mm
C1		9.3	mm
C2		4.2	mm
C3		3	mm
r1,2	min.	1.1	mm
r3,4	min.	0.6	mm
a		23.5	mm

Abutment dimensions

da	min.	96	mm
db	min.	96	mm
Da	max.	119	mm
Db	max.	121	mm
ra	max.	1	mm
rb	max.	0.6	mm
dn		103.3	mm

Calculation data

Basic dynamic load rating	C		47.5	kN
Basic static load rating	C0		51	kN
Fatigue load limit	Pu		2.08	kN
Attainable speed for grease lubrication			9500	r/min
Attainable speed for oil-air lubrication			16000	r/min
Ball diameter	Dw		11.112	mm
Number of balls	z		26
Reference grease quantity	Gref		7.5	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	GA		180	N
Static axial stiffness, preload class A			94	N/µm
Preload class B	GB		360	N
Static axial stiffness, preload class B			129	N/µm
Preload class C	GC		720	N
Static axial stiffness, preload class C			183	N/µm
Preload class D	GD		1440	N
Static axial stiffness, preload class D			268	N/µm
Calculation factors
Calculation factor	f		1.23
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		16.3

Mass

Mass bearing

0.55

kg

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