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

71904 ACD/HCP4A

Dimensions

d		20	mm
D		37	mm
B		9	mm
d₁		25.6	mm
d₂		25.6	mm
D₁		31.4	mm
r_1,2	min.	0.3	mm
r_3,4	min.	0.2	mm
a		11.2	mm

Abutment dimensions

d_a	min.	22	mm
d_b	min.	22	mm
D_a	max.	35	mm
D_b	max.	35.6	mm
r_a	max.	0.3	mm
r_b	max.	0.2	mm
d_n		26.8	mm

Calculation data

Basic dynamic load rating	C	5.72	kN
Basic static load rating	C₀	3.05	kN
Fatigue load limit	P_u	0.129	kN
Attainable speed for grease lubrication		45000	r/min
Attainable speed for oil-air lubrication		67000	r/min
Ball diameter	D_w	4.762	mm
Number of balls	z	15
Reference grease quantity	G_ref	0.45	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	35	N
Static axial stiffness, preload class A		56	N/µm
Preload class B	G_B	70	N
Static axial stiffness, preload class B		73	N/µm
Preload class C	G_C	140	N
Static axial stiffness, preload class C		95	N/µm
Preload class D	G_D	280	N
Static axial stiffness, preload class D		125	N/µm
Calculation factors
Calculation factor	f	1.05
Calculation factor	f₁	0.98
Calculation factor	f_2A	1
Calculation factor	f_2B	1.07
Calculation factor	f_2C	1.12
Calculation factor	f_2D	1.17
Calculation factor	f_HC	1.04
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

0.033

Model Number: 71904 ACD/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：2026-08-19
Application:experimental equipment,construction machinery and equipment,Material handling equipment,Equipment,trolley,powder metallurgy,Pump,food sterilization,luminescent reagent,electrocardiograph,multi-knife lathe
Similar models:71904 CE/P4AH S71904 ACD/HCP4A 71904 CE/P4A S71904 ACE/HCP4A S71904 ACE/P4A S71904 ACD/P4A 71904 ACD/HCP4A 71904 CD/P4A 71904 ACE/HCP4AL 71904 CD/HCP4A
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Model No. Inner Diameter Outer Diameter Width Type

1450 VRME R
51247
71912 ACD/P4AL
LS 160200
OKC 840

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

Hot number： 125x150x12 HMSA10 V 212 30230T168/DB 44x62x10 HMS5 V 524232 61928 MA 7473 90 VS R NJ 348 ML NNCF 5034 CV NU 1028 M/C3VL2071 PWM 150165180 SAFS 22528 SIL 50 ESX-2LS SSAFS 22232 T

Model No.	Inner Diameter	Outer Diameter	Width	Type
1450 VRME R
51247
71912 ACD/P4AL
LS 160200
OKC 840