Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7221 ACD/HCP4A

7221 ACD/HCP4A

Dimensions

d		105	mm
D		190	mm
B		36	mm
d₁		131.2	mm
d₂		131.2	mm
D₁		163.8	mm
r_1,2	min.	2.1	mm
r_3,4	min.	1.1	mm
a		52.6	mm

Abutment dimensions

d_a	min.	117	mm
d_b	min.	117	mm
D_a	max.	178	mm
D_b	max.	183	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		138.4	mm

Calculation data

Basic dynamic load rating	C	163	kN
Basic static load rating	C₀	146	kN
Fatigue load limit	P_u	5.1	kN
Attainable speed for grease lubrication		7500	r/min
Attainable speed for oil-air lubrication		12000	r/min
Ball diameter	D_w	26.988	mm
Number of balls	z	15
Reference grease quantity	G_ref	48.333	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	1000	N
Static axial stiffness, preload class A		342	N/µm
Preload class B	G_B	2000	N
Static axial stiffness, preload class B		443	N/µm
Preload class C	G_C	4000	N
Static axial stiffness, preload class C		585	N/µm
Preload class D	G_D	8000	N
Static axial stiffness, preload class D		786	N/µm
Calculation factors
Calculation factor	f	1.08
Calculation factor	f₁	0.99
Calculation factor	f_2A	1
Calculation factor	f_2B	1.01
Calculation factor	f_2C	1.03
Calculation factor	f_2D	1.06
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

3.14

Model Number: 7221 ACD/HCP4A
Inner Diameter：105mm Outer Diameter：190mm Width：36mm
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：2026-04-17
Application:Die,engine,historical instruments,Laser Cutting,Beauty and Body,cleaners,ship special,steam Hydraulic control element,textile machinery,motor,gas turbine
Similar models:7221 BECBP 7221 BECBM 7221 ACD/P4A 7221 ACD/HCP4A 72212/72487 7221 CD/P4A 7221 BEP
BEARING POWER International Trading Co.,Ltd. specialize in 7221ACD/HCP4A products，there is large inventory of SKF 7221 ACD/HCP4A Angular contact ball bearings, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the 7221 ACD/HCP4A Which SKF 7221ACD/HCP4A is the most authentic, must choose BEARING POWER, what a whole variety, reasonable price, guaranteed quality, prompt delivery via Global express. Any inquiry, never hesitate to E-mail or call +86-022-58519721 to contact us.

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Hot number： 22310 EK 26x42x7 HMSA10 RG 32028T130 X/DB 53318 + U 318 7005 ACE/P4AH1 71906 ACE/P4AH AS 2035 HK 3026 LM 11949/910 MB 14 NU 2336 ECML PRMF 455045 SAF 22544 x 7.7/8 SNW 34x5.7/8 SSAFS 22640 T