Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7021 ACD/HCP4A

7021 ACD/HCP4A

Dimensions

d		105	mm
D		160	mm
B		26	mm
d₁		121.9	mm
d₂		121.9	mm
D₁		143.1	mm
r_1,2	min.	2	mm
r_3,4	min.	1	mm
a		44	mm

Abutment dimensions

d_a	min.	114	mm
d_b	min.	114	mm
D_a	max.	151	mm
D_b	max.	155	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		125.6	mm

Calculation data

Basic dynamic load rating	C	90.4	kN
Basic static load rating	C₀	93	kN
Fatigue load limit	P_u	3.4	kN
Attainable speed for grease lubrication		9000	r/min
Attainable speed for oil-air lubrication		14000	r/min
Ball diameter	D_w	17.462	mm
Number of balls	z	21
Reference grease quantity	G_ref	20.4	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	560	N
Static axial stiffness, preload class A		309	N/µm
Preload class B	G_B	1120	N
Static axial stiffness, preload class B		405	N/µm
Preload class C	G_C	2240	N
Static axial stiffness, preload class C		537	N/µm
Preload class D	G_D	4480	N
Static axial stiffness, preload class D		727	N/µm
Calculation factors
Calculation factor	f	1.15
Calculation factor	f₁	0.99
Calculation factor	f_2A	1
Calculation factor	f_2B	1.02
Calculation factor	f_2C	1.05
Calculation factor	f_2D	1.08
Calculation factor	f_HC	1.02
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

1.32

Model Number: 7021 ACD/HCP4A
Inner Diameter：105mm Outer Diameter：160mm Width：26mm
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：2026-07-23
Application:lifting upgrade,ultra-quiet generators,plastic blow molding,X-ray Equipment,power protection,other lathe,Display Devices,powder metallurgy,disposable,surgical instruments,atomizer class
Similar models:7021 ACD/HCP4A 7021 ACD/P4AH1 S7021 ACD/P4A S7021 CD/P4A 7021 ACD/P4A 7021 CD/P4A 7021 CD/HCP4AH1 7021 ACD/HCP4AL 7021 CD/P4AL 7021 CD/HCP4A
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Model No. Inner Diameter Outer Diameter Width Type

BD-22309 EK-H 2309
28748
403004
FYWK 25 YTA
S71907 CE/HCP4A

Purchase the SKF 7021 ACD/HCP4A Please fill in the following

Hot number： 10035 37325 71913 ACB/P4A BD-C 3152 K-OH 3152 HTL C 4010 V FYR 3 15/16 K 81220 TN N 080 PBM 354570 M1G1 NU 1012 ML PCM 10010580 M QJ 217 N2MA SNW 3024x4.1/4 SYJ 90 TF YSPAG 209

Model No.	Inner Diameter	Outer Diameter	Width	Type
BD-22309 EK-H 2309
28748
403004
FYWK 25 YTA
S71907 CE/HCP4A