Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7228 CD/HCP4A

7228 CD/HCP4A

Dimensions

d		140	mm
D		250	mm
B		42	mm
d₁		176.8	mm
d₂		176.8	mm
D₁		213.2	mm
r_1,2	min.	3	mm
r_3,4	min.	1.5	mm
a		47.3	mm

Abutment dimensions

d_a	min.	154	mm
d_b	min.	154	mm
D_a	max.	236	mm
D_b	max.	241	mm
r_a	max.	2.5	mm
r_b	max.	1.5	mm
d_n		184.8	mm

Calculation data

Basic dynamic load rating	C	221	kN
Basic static load rating	C₀	240	kN
Fatigue load limit	P_u	7.35	kN
Attainable speed for grease lubrication		7000	r/min
Attainable speed for oil-air lubrication		10000	r/min
Ball diameter	D_w	30.162	mm
Number of balls	z	18
Reference grease quantity	G_ref	83.931	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	850	N
Static axial stiffness, preload class A		181	N/µm
Preload class B	G_B	1700	N
Static axial stiffness, preload class B		245	N/µm
Preload class C	G_C	3400	N
Static axial stiffness, preload class C		339	N/µm
Preload class D	G_D	6800	N
Static axial stiffness, preload class D		485	N/µm
Calculation factors
Calculation factor	f	1.09
Calculation factor	f₁	1
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	f₀	15.2

Mass

Mass bearing

6.92

Model Number: 7228 CD/HCP4A
Inner Diameter：140mm Outer Diameter：250mm Width：42mm
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：2025-12-09
Application:product accessories,static control,Roller mill,multi-knife lathe,comprehensive experiment,Rolling mill,lifting equipment Hoisting hoist,glass,set bacteria instrument,cleaning agent,pump
Similar models:7228 BM 7228 BCBM 7228 BGAM 7228 CD/HCP4A 7228 ACD/HCP4A 7228 CD/P4A 7228 ACD/P4A
BEARING POWER International Trading Co.,Ltd. specialize in 7228CD/HCP4A products，there is large inventory of SKF 7228 CD/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 7228 CD/HCP4A Which SKF 7228CD/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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