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

71909 ACE/HCP4A

Dimensions

d		45	mm
D		68	mm
B		12	mm
d₁		52.7	mm
d₂		51	mm
D₁		60.3	mm
r_1,2	min.	0.6	mm
r_3,4	min.	0.3	mm
a		20	mm

Abutment dimensions

d_a	min.	48.2	mm
d_b	min.	47	mm
D_a	max.	64.8	mm
D_b	max.	66	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	9.75	kN
Basic static load rating	C₀	6.55	kN
Fatigue load limit	P_u	0.275	kN
Attainable speed for grease lubrication		30000	r/min
Attainable speed for oil-air lubrication		47000	r/min
Ball diameter	D_w	6.35	mm
Number of balls	z	21
Reference grease quantity	G_ref	1.5	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	88	N
Static axial stiffness, preload class A		94	N/µm
Preload class B	G_B	265	N
Static axial stiffness, preload class B		141	N/µm
Preload class C	G_C	529	N
Static axial stiffness, preload class C		185	N/µm
Calculation factors
Calculation factor	f	1.09
Calculation factor	f₁	0.98
Calculation factor	f_2A	1
Calculation factor	f_2B	1.04
Calculation factor	f_2C	1.08
Calculation factor	f_HC	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

0.12

Model Number: 71909 ACE/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：2026-06-24
Application:teaching equipment,medical equipment,inorganic chemical,hot and cold box,experimental equipment,building decoration raw materials and accessories,shaft milling machine,Security Equipment,Garment Accessories,sheet industry,Microwave Equipment
Similar models:71909 CB/P4AL 71909 ACE/HCP4A S71909 ACB/HCP4A 71909 ACE/P4AL 71909 ACB/P4AL S71909 CB/P4A 71909 CB/HCP4AL 71909 ACD/HCP4A 71909 ACE/HCP4AL 71909 ACE/P4AH1
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Model No. Inner Diameter Outer Diameter Width Type

110 VS R
1850 VE R
709 ACD/HCP4A
FSAF 22515 x 2.1/2 T
NJ 18/560 ECMA

Purchase the SKF 71909 ACE/HCP4A Please fill in the following

Hot number： 48x72x7 HMSA10 V 7208 BECBP 81111 TN 9850 C 4168 K30MB FYTWK 40 LTHR GEZM 010 ES KMD 10 NJ 2218 ECM NKI 20/20 NUP 2305 ECP NUP 2307 ECP NUP 2308 ECM SYE 1 1/2 N WS 81118

Model No.	Inner Diameter	Outer Diameter	Width	Type
110 VS R
1850 VE R
709 ACD/HCP4A
FSAF 22515 x 2.1/2 T
NJ 18/560 ECMA