Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71909 CD/HCP4A

71909 CD/HCP4A

Dimensions

d		45	mm
D		68	mm
B		12	mm
d₁		52.6	mm
d₂		52.6	mm
D₁		60.4	mm
r_1,2	min.	0.6	mm
r_3,4	min.	0.3	mm
a		13.6	mm

Abutment dimensions

d_a	min.	48.2	mm
d_b	min.	48.2	mm
D_a	max.	64.8	mm
D_b	max.	66.6	mm
r_a	max.	0.6	mm
r_b	max.	0.3	mm
d_n		54.2	mm

Calculation data

Basic dynamic load rating	C	13	kN
Basic static load rating	C₀	9.5	kN
Fatigue load limit	P_u	0.4	kN
Attainable speed for grease lubrication		24000	r/min
Attainable speed for oil-air lubrication		36000	r/min
Ball diameter	D_w	6.35	mm
Number of balls	z	23
Reference grease quantity	G_ref	1.62	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	50	N
Static axial stiffness, preload class A		44	N/µm
Preload class B	G_B	100	N
Static axial stiffness, preload class B		59	N/µm
Preload class C	G_C	200	N
Static axial stiffness, preload class C		81	N/µm
Preload class D	G_D	400	N
Static axial stiffness, preload class D		115	N/µm
Calculation factors
Calculation factor	f	1.11
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.07
Calculation factor	f_2C	1.12
Calculation factor	f_2D	1.18
Calculation factor	f_HC	1.04
Calculation factor	f₀	10.5

Mass

Mass bearing

0.12

Model Number: 71909 CD/HCP4A
Inner Diameter：45mm Outer Diameter：68mm Width：12mm
Reference speed:- Limiting speed:-
Type：Bearings, units and housings Super-precision bearings Angular contact ball bearings Angular contact ball bearings, super-precision
Details： Angular contact ball bearings, super-precision
Update date：2026-04-16
Application:Other Measurements,Air,Garment Accessories,office equipment,food sterilization,screen filter,other processing,Spectral Products,engine,wire industry,Workpiece
Similar models:71909 ACE/HCP4AL S71909 ACD/P4A 71909 ACE/HCP4AH1 71909 CB/HCP4A 71909 CE/P4A S71909 CB/HCP4A S71909 ACB/HCP4A 71909 ACB/P4A 71909 CE/P4AH1 71909 CE/P4AL
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6004/HR11TN	20	42	12	Bearings, units and housings
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BK 2020	20	26	20	Bearings, units and housings
IR 140x155x35	140	155	35	Bearings, units and housings
OKBS 51	51	-	-
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SAFS 23034 KAT x 5.15/16	150.8125	-	-	Bearings, units and housings

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