Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71956 ACD/P4A

71956 ACD/P4A

Dimensions

d		280	mm
D		380	mm
B		46	mm
d₁		311.8	mm
d₂		311.8	mm
D₁		348.2	mm
r_1,2	min.	2.1	mm
r_3,4	min.	1.1	mm
a		100.2	mm

Abutment dimensions

d_a	min.	291	mm
d_b	min.	291	mm
D_a	max.	369	mm
D_b	max.	374	mm
r_a	max.	2	mm
r_b	max.	1	mm
d_n		319.7	mm

Calculation data

Basic dynamic load rating	C	276	kN
Basic static load rating	C₀	430	kN
Fatigue load limit	P_u	10	kN
Attainable speed for grease lubrication		2600	r/min
Attainable speed for oil-air lubrication		4000	r/min
Ball diameter	D_w	30.162	mm
Number of balls	z	31
Reference grease quantity	G_ref	159	cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	1700	N
Static axial stiffness, preload class A		659	N/µm
Preload class B	G_B	3400	N
Static axial stiffness, preload class B		867	N/µm
Preload class C	G_C	6800	N
Static axial stiffness, preload class C		1154	N/µm
Preload class D	G_D	13600	N
Static axial stiffness, preload class D		1572	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

12.9

Model Number: 71956 ACD/P4A
Inner Diameter：280mm Outer Diameter：380mm Width：46mm
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:rock drilling machinery,pump,Air,industrial supplies,bio-chemical,Wire grinder,metering pump,Hydraulic Couplings,teaching equipment,tray industry,hot and cold box
Similar models:71956 CD/P4A 71956 CD/HCP4A 71956 ACD/P4A 71956 ACD/HCP4A
BEARING POWER International Trading Co.,Ltd. specialize in 71956ACD/P4A products，there is large inventory of SKF 71956 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 71956 ACD/P4A Which SKF 71956ACD/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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Hot number： 15960 31177 33015/DFC240 464777 7200 BEP 7024 ACE/HCP4A 71909 ACE/P4AH1 790x850x25 HDS2 V 90198 K 20x24x13 P 35 TF PF 80 SAFS 22517 x 2.13/16 T SYR 1 7/16 SNW 140x8