Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71921 ACD/P4AL

71921 ACD/P4AL

Dimensions

d		105	mm
D		145	mm
B		20	mm
d₁		117.3	mm
d₂		117.3	mm
D₁		132.7	mm
b		2.3	mm
C₁		10.9	mm
C₂		3.9	mm
C₃		3.2	mm
r_1,2	min.	1.1	mm
r_3,4	min.	0.6	mm
a		39.3	mm

Abutment dimensions

d_a	min.	111	mm
d_b	min.	111	mm
D_a	max.	139	mm
D_b	max.	141	mm
r_a	max.	1	mm
r_b	max.	0.6	mm
d_n		120.6	mm

Calculation data

Basic dynamic load rating	C	57.2	kN
Basic static load rating	C₀	65.5	kN
Fatigue load limit	P_u	2.5	kN
Attainable speed for grease lubrication		7500	r/min
Attainable speed for oil-air lubrication		12000	r/min
Ball diameter	D_w	12.7	mm
Number of balls	z	27
Reference grease quantity	G_ref	11.1	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	360	N
Static axial stiffness, preload class A		263	N/µm
Preload class B	G_B	720	N
Static axial stiffness, preload class B		346	N/µm
Preload class C	G_C	1440	N
Static axial stiffness, preload class C		463	N/µm
Preload class D	G_D	2880	N
Static axial stiffness, preload class D		633	N/µm
Calculation factors
Calculation factor	f	1.25
Calculation factor	f₁	0.98
Calculation factor	f_2A	1
Calculation factor	f_2B	1.04
Calculation factor	f_2C	1.08
Calculation factor	f_2D	1.14
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

0.82

Model Number: 71921 ACD/P4AL
Inner Diameter：105mm Outer Diameter：145mm Width：20mm
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：2026-04-16
Application:surgical instruments,Pneumatic Actuator,Generator,extruder,wall industry,raw material accessories,generator,security,product accessories,electronic components,luminescent reagent
Similar models:71921 ACD/P4A S71921 ACD/HCP4A 71921 ACD/P4AL 71921 CD/HCP4AL S71921 ACD/P4A 71921 ACD/HCP4AL 71921 ACD/HCP4AH1 71921 CD/HCP4A 71921 CD/P4AH1 S71921 CD/HCP4A
BEARING POWER International Trading Co.,Ltd. specialize in 71921ACD/P4AL products，there is large inventory of SKF 71921 ACD/P4AL Angular contact ball bearings, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the 71921 ACD/P4AL Which SKF 71921ACD/P4AL 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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331290	685.8	876.3	-	Bearings, units and housings
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9939	25.4	41.25	6.35	Seals
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NJ 220 ECML	100	180	34	Bearings, units and housings
RN-2x13.8 BF/G2	-	-	2	Bearings, units and housings
SY 1.1/4 FM	31.75	-	-	Bearings, units and housings
WS 89426	130		28.5	Bearings, units and housings

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Hot number： 2202 ETN9 BD-239/530 CAK/W33-OH 39/530 H 42419 7013 ACE/HCP4AL1 81115 TN 99819 BD-C 2209 KTN9-H 309 E C 2216 K FSAF 1516 x 2.5/8 JM 716649/610 MVR2-80 N 1008 KPHA/SP OKTC 525 PSM 040708 A51 SNL 3188 TURA