Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71938 CD/HCP4A

71938 CD/HCP4A

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		46.8	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	172	kN
Basic static load rating	C₀	220	kN
Fatigue load limit	P_u	6.2	kN
Attainable speed for grease lubrication		6300	r/min
Attainable speed for oil-air lubrication		9000	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	640	N
Static axial stiffness, preload class A		210	N/µm
Preload class B	G_B	1280	N
Static axial stiffness, preload class B		288	N/µm
Preload class C	G_C	2560	N
Static axial stiffness, preload class C		408	N/µm
Preload class D	G_D	5120	N
Static axial stiffness, preload class D		597	N/µm
Calculation factors
Calculation factor	f	1.27
Calculation factor	f₁	1
Calculation factor	f_2A	1
Calculation factor	f_2B	1.07
Calculation factor	f_2C	1.12
Calculation factor	f_2D	1.18
Calculation factor	f_HC	1.04
Calculation factor	f₀	16.4

Mass

Mass bearing

3.64

Model Number: 71938 CD/HCP4A
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：2026-08-19
Application:Logistics Equipment,molding machine,Hair styling device,Spectral Products,medical equipment,Sensors,economic mold,ship special,Polymer,tube,turret industry
Similar models:71938 CD/HCP4AH1 71938 ACD/HCP4A 71938 ACD/P4A 71938 ACD/HCP4AH1 71938 CD/P4A 71938 CD/HCP4A
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Model No. Inner Diameter Outer Diameter Width Type

16743
18657
6224
98444
FNL 522 A

Purchase the SKF 71938 CD/HCP4A Please fill in the following

Hot number： 23040 18x35x7 CRW1 R 2312 K + H 2312 30095 471851 6016-Z 707 ACE/HCP4AH AH 2332 G C 3984 KM D/W ER1212 D/W RW2 R FYWR 1.1/2 YTHR GEZ 212 ES MB 14 A SAL 10 E

Model No.	Inner Diameter	Outer Diameter	Width	Type
16743
18657
6224
98444
FNL 522 A