Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71909 ACE/P4A

71909 ACE/P4A

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		25000	r/min
Attainable speed for oil-air lubrication		39000	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		85	N/µm
Preload class B	G_B	265	N
Static axial stiffness, preload class B		127	N/µm
Preload class C	G_C	529	N
Static axial stiffness, preload class C		166	N/µm
Calculation factors
Calculation factor	f	1.09
Calculation factor	f₁	0.99
Calculation factor	f_2A	1
Calculation factor	f_2B	1.04
Calculation factor	f_2C	1.07
Calculation factor	f_HC	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

0.13

Model Number: 71909 ACE/P4A
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：2026-08-19
Application:rock drilling machinery,thin metal materials,Hydraulic Rama,Traffic Fire Protection Equipment Security equipment,Animal Tracking,crimping tools,marine analysis,stamping die,car shock absorber,Roller mill,Optical Instruments
Similar models:71909 ACD/P4A S71909 ACB/HCP4A 71909 CE/P4AL S71909 CE/P4A 71909 ACE/P4AH1 71909 ACE/P4A 71909 CB/P4AL 71909 CE/HCP4AH1 71909 CE/P4A 71909 ACE/HCP4AL
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Model No. Inner Diameter Outer Diameter Width Type

404353
812/900 M
G 5x9x2 S
SAF 1520 x 3.5/16 TLC
W 61708-2RS1

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Hot number： 2200590 240/1060 CAK30F/W33 2500247 30203 314420 400201 6200-RSL 62572 6313 M 7028 ACD/HCP4A GEZ 308 ESL-2LS NU 2316 ECM PBMF 142010 M1G1 W 6210-2Z W 637/4 X

Model No.	Inner Diameter	Outer Diameter	Width	Type
404353
812/900 M
G 5x9x2 S
SAF 1520 x 3.5/16 TLC
W 61708-2RS1