Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71938 ACD/P4A

71938 ACD/P4A

Dimensions

d		190	mm
D		260	mm
B		33	mm
d₁		211.6	mm
d₂		211.6	mm
D₁		238.4	mm
r_1,2	min.	2	mm
r_3,4	min.	1	mm
a		69.2	mm

Abutment dimensions

d_a	min.	199	mm
d_b	min.	199	mm
D_a	max.	251	mm
D_b	max.	255	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		217.4	mm

Calculation data

Basic dynamic load rating	C	163	kN
Basic static load rating	C₀	208	kN
Fatigue load limit	P_u	5.85	kN
Attainable speed for grease lubrication		4500	r/min
Attainable speed for oil-air lubrication		6700	r/min
Ball diameter	D_w	22.225	mm
Number of balls	z	28
Reference grease quantity	G_ref	57	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	1000	N
Static axial stiffness, preload class A		455	N/µm
Preload class B	G_B	2000	N
Static axial stiffness, preload class B		599	N/µm
Preload class C	G_C	4000	N
Static axial stiffness, preload class C		798	N/µm
Preload class D	G_D	8000	N
Static axial stiffness, preload class D		1090	N/µm
Calculation factors
Calculation factor	f	1.27
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

4.35

Model Number: 71938 ACD/P4A
Inner Diameter：190mm Outer Diameter：260mm Width：33mm
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：2026-04-18
Application:wheel lathe,car steering pin,internal combustion engine,Rolling mill gear box,stamping die and its equipment,impression material,centrifugal pump,clean stationery,Spectrum Products,bio-chemical,tobacco machinery
Similar models:71938 CD/HCP4AH1 71938 ACD/HCP4A 71938 CD/P4A 71938 ACD/P4A 71938 CD/HCP4A 71938 ACD/HCP4AH1
BEARING POWER International Trading Co.,Ltd. specialize in 71938ACD/P4A products，there is large inventory of SKF 71938 ACD/P4A Angular contact ball bearings, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the 71938 ACD/P4A Which SKF 71938ACD/P4A 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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FY 20 TF	20	-	-	Bearings, units and housings
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