Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71904 ACE/HCP4A

71904 ACE/HCP4A

Dimensions

d		20	mm
D		37	mm
B		9	mm
d₁		25.65	mm
d₂		24.4	mm
D₁		31.49	mm
r_1,2	min.	0.3	mm
r_3,4	min.	0.15	mm
a		11.6	mm

Abutment dimensions

d_a	min.	22	mm
d_b	min.	22	mm
D_a	max.	35	mm
D_b	max.	36.2	mm
r_a	max.	0.3	mm
r_b	max.	0.15	mm
d_n		26.7	mm

Calculation data

Basic dynamic load rating	C	4.68	kN
Basic static load rating	C₀	2.28	kN
Fatigue load limit	P_u	0.098	kN
Attainable speed for grease lubrication		60000	r/min
Attainable speed for oil-air lubrication		95000	r/min
Ball diameter	D_w	4.762	mm
Number of balls	z	14
Reference grease quantity	G_ref	0.5	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	42	N
Static axial stiffness, preload class A		52	N/µm
Preload class B	G_B	130	N
Static axial stiffness, preload class B		76	N/µm
Preload class C	G_C	250	N
Static axial stiffness, preload class C		98	N/µm
Calculation factors
Calculation factor	f	1.04
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

0.032

Model Number: 71904 ACE/HCP4A
Inner Diameter：20mm Outer Diameter：37mm Width：9mm
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：2026-08-14
Application:sawing machine,atomizer class,molding machine,medical equipment,forklift truck,Material handling equipment,test strip,medical equipment,Pneumatic Control Valves,pump,large agricultural machinery
Similar models:71904 CD/P4A 71904 ACE/HCP4A 71904 ACE/P4AL S71904 ACD/P4A S71904 ACD/HCP4A S71904 CE/HCP4A 71904 CE/HCP4A 71904 CE/P4A 71904 ACE/HCP4AL S71904 CE/P4A
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Model No. Inner Diameter Outer Diameter Width Type

11728
77531
NKS 25
NUP 212 ECM
SYR 1 11/16-18

Purchase the SKF 71904 ACE/HCP4A Please fill in the following

Hot number： 200x230x16 HDS1 R 25x37x6 HMSA10 RG 400054 43691 54931 7013 CB/HCP4AL 71916 CB/P4A BD-C 2216 KV-H 316 N 215 ECP NKX 20 Z NU 338 ECM OKBS 128 OKF 390 PRM 707560 SSAFS 22238

Model No.	Inner Diameter	Outer Diameter	Width	Type
11728
77531
NKS 25
NUP 212 ECM
SYR 1 11/16-18