Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71940 ACD/HCP4AH1

71940 ACD/HCP4AH1

Dimensions

d		200	mm
D		280	mm
B		38	mm
d₁		224.7	mm
d₂		224.7	mm
D₁		255.3	mm
K		0.6	mm
C₁		10	mm
r_1,2	min.	2.1	mm
r_3,4	min.	1	mm
a		75.2	mm

Abutment dimensions

d_a	min.	209	mm
d_b	min.	209	mm
D_a	max.	271	mm
D_b	max.	275	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		231.4	mm

Calculation data

Basic dynamic load rating	C	199	kN
Basic static load rating	C₀	250	kN
Fatigue load limit	P_u	6.8	kN
Attainable speed for grease lubrication		5000	r/min
Attainable speed for oil-air lubrication		7500	r/min
Ball diameter	D_w	25.4	mm
Number of balls	z	26
Reference grease quantity	G_ref	81	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	1250	N
Static axial stiffness, preload class A		538	N/µm
Preload class B	G_B	2500	N
Static axial stiffness, preload class B		704	N/µm
Preload class C	G_C	5000	N
Static axial stiffness, preload class C		938	N/µm
Preload class D	G_D	10000	N
Static axial stiffness, preload class D		1274	N/µm
Calculation factors
Calculation factor	f	1.23
Calculation factor	f₁	0.98
Calculation factor	f_2A	1
Calculation factor	f_2B	1.07
Calculation factor	f_2C	1.12
Calculation factor	f_2D	1.17
Calculation factor	f_HC	1.04
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

5.11

Model Number: 71940 ACD/HCP4AH1
Inner Diameter：200mm Outer Diameter：280mm Width：38mm
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：2026-07-26
Application:roller lathe,machine tool spindle,lifting chain,insect experimental analysis instrument,Hydraulic Couplings,switch,Oral Equipment,Medical room equipment,Air,Optical detection,Gear grinding machine
Similar models:71940 ACD/P4AH1 71940 ACD/HCP4AH1 71940 CD/HCP4A 71940 ACD/P4A 71940 ACD/HCP4A 71940 CD/HCP4AH1 71940 CD/P4AH1 71940 CD/P4A
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Model No. Inner Diameter Outer Diameter Width Type

470921
85531
NJ 2330 ECML
SAF 23024 KATLC x 4.3/16
W 626 R-2Z

Purchase the SKF 71940 ACD/HCP4AH1 Please fill in the following

Hot number： 12364 1450 VRME R 145x175x15 HMSA10 RG 170 VL R 305706 C-2Z 401200 6321-Z 71916 ACE/P4AH1 BT4B 328909 G/HA1VA901 FSNL 517 GS 89322 HME 31/600 PF 45 RM SSAFS 22536 x 6.5/16 TLC SY 1. TF/VA201

Model No.	Inner Diameter	Outer Diameter	Width	Type
470921
85531
NJ 2330 ECML
SAF 23024 KATLC x 4.3/16
W 626 R-2Z