Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71821 ACD/P4

71821 ACD/P4

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		8000	r/min
Attainable speed for oil-air lubrication		12000	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		220	N/µm
Preload class B	G_B	600	N
Static axial stiffness, preload class B		353	N/µm
Preload class C	G_C	1200	N
Static axial stiffness, preload class C		488	N/µm
Calculation factors
Calculation factor	f	1.44
Calculation factor	f₁	0.97
Calculation factor	f_2A	1
Calculation factor	f_2B	1.08
Calculation factor	f_2C	1.15
Calculation factor	f_HC	1
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

0.32

Model Number: 71821 ACD/P4
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：2025-12-09
Application:sawing machine,air conditioning tools,hot and cold box,equipment and,aerial work equipment,Vertical pull,spectrometer,Spectrum Products,Other machinery,Broadcasting System,Warehouse Shelf Equipment
Similar models:71821 CD/HCP4 71821 ACD/HCP4 71821 CD/P4 71821 ACD/P4
BEARING POWER International Trading Co.,Ltd. specialize in 71821ACD/P4 products，there is large inventory of SKF 71821 ACD/P4 Angular contact ball bearings, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the 71821 ACD/P4 Which SKF 71821ACD/P4 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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