Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71821 ACD/HCP4

71821 ACD/HCP4

Dimensions

d		105	mm
D		130	mm
B		13	mm
d₁		113.2	mm
d₂		113.2	mm
D₁		122	mm
r_1,2	min.	1	mm
r_3,4	min.	0.3	mm
a		34	mm

Abutment dimensions

d_a	min.	109.6	mm
d_b	min.	109.6	mm
D_a	max.	125.4	mm
D_b	max.	128	mm
r_a	max.	1	mm
r_b	max.	0.3	mm
d_n		114.6	mm

Calculation data

Basic dynamic load rating	C	21.6	kN
Basic static load rating	C₀	28.5	kN
Fatigue load limit	P_u	1.1	kN
Attainable speed for grease lubrication		9500	r/min
Attainable speed for oil-air lubrication		15000	r/min
Ball diameter	D_w	7.144	mm
Number of balls	z	35
Reference grease quantity	G_ref	4	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	200	N
Static axial stiffness, preload class A		244	N/µm
Preload class B	G_B	600	N
Static axial stiffness, preload class B		392	N/µm
Preload class C	G_C	1200	N
Static axial stiffness, preload class C		541	N/µm
Calculation factors
Calculation factor	f	1.44
Calculation factor	f₁	0.97
Calculation factor	f_2A	1
Calculation factor	f_2B	1.09
Calculation factor	f_2C	1.17
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

0.29

Model Number: 71821 ACD/HCP4
Inner Diameter：105mm Outer Diameter：130mm Width：13mm
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:garbage disposal,chemical,Die,spectrometer,Blood coagulation reagent,security equipment,power tools,rolling machine,chemical instruments,SPA equipment,generator
Similar models:71821 CD/P4 71821 ACD/P4 71821 CD/HCP4 71821 ACD/HCP4
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Model No. Inner Diameter Outer Diameter Width Type

51156 M
695x770x30 HDS1 R
7048 BGM
GE 20 ESL-2LS
SAF 23028 KAT x 4.15/16

Purchase the SKF 71821 ACD/HCP4 Please fill in the following

Hot number： 1210 EKTN9 + H 210 1350 VE R 15662 BD-22308 EK-H 2308 42x62x8 CRW1 V KR 26 PPA NNU 41/1120 K30M/W33 P 85 R-1.1/2 TF S7002 ACD/P4A S7210 ACD/P4A SAF 22510 x 1.3/4 T SAF 22518 T SAF 23040 KAT x 7.3/16 SILKAC 10 M SY 30 FM

Model No.	Inner Diameter	Outer Diameter	Width	Type
51156 M
695x770x30 HDS1 R
7048 BGM
GE 20 ESL-2LS
SAF 23028 KAT x 4.15/16