Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF S71921 CD/HCP4A

S71921 CD/HCP4A

Dimensions

d		105	mm
D		145	mm
B		20	mm
d₁		117.3	mm
d₂		117.3	mm
D₂		135.65	mm
r_1,2	min.	1.1	mm
r_3,4	min.	0.6	mm
a		26.8	mm

Abutment dimensions

d_a	min.	111	mm
d_a	max.	116.7	mm
d_b	min.	111	mm
d_b	max.	116.7	mm
D_a	max.	139	mm
D_b	max.	141	mm
r_a	max.	1	mm
r_b	max.	0.6	mm

Calculation data

Basic dynamic load rating	C	61.8	kN
Basic static load rating	C₀	69.5	kN
Fatigue load limit	P_u	2.6	kN
Attainable speed for grease lubrication		10000	r/min
Ball diameter	D_w	12.7	mm
Number of balls	z	27
Preload and stiffness (back-to-back, face-to-face)
Preload class A	G_A	230	N
Static axial stiffness, preload class A		122	N/µm
Preload class B	G_B	460	N
Static axial stiffness, preload class B		168	N/µm
Preload class C	G_C	920	N
Static axial stiffness, preload class C		239	N/µm
Preload class D	G_D	1840	N
Static axial stiffness, preload class D		350	N/µm
Calculation factors
Calculation factor	f	1.25
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

0.71

Model Number: S71921 CD/HCP4A
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：2025-12-09
Application:pressure control valve,Material handling equipment,surgical instruments,pump,supporting facilities,Pneumatic Actuator,light therapy instrument,economic mold,Cutting Machine,engine,Body shaping
Similar models:71921 CD/P4AL 71921 ACD/P4AL 71921 ACD/HCP4AL 71921 ACD/P4A 71921 CD/HCP4A 71921 CD/P4A S71921 CD/HCP4A 71921 ACD/P4AH1 S71921 CD/P4A 71921 CD/P4AH1
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Model No.	Inner Diameter	Outer Diameter	Width	Type
14018	35.0012	62.001	10.008	Seals
22x42x10 HMS5 RG	22	42	10	Seals
30x50x7 HMS5 V	30	50	7	Seals
38673	98.425	123.85	11.13	Seals
413006	1180	-	-	Seals
51256 M	280	380	80	Bearings, units and housings
6022-2Z/VA208	110	170	28	Bearings, units and housings
6336 M/C3VL2071	180	380	75	Bearings, units and housings
71920 ACE/HCP4A	100	140	20	Bearings, units and housings
7453	19.05	31.75	6.35	Seals
NNU 4172 M	360	600	243	Bearings, units and housings
OKTC 305	-	465	-

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Hot number： 1322 KM 150x180x13 CRSH1 R 40x65x12 HMSA10 V 7014 CD/P4AH1 7044 ACD/P4A 7308 BEGAP D/W R2-2RZ FNL 509 A FY 25 LDW HME 30/950 JLM 104948 AA/910 AA K 19x23x17 NA 2202.2RSX NJ 2320 ECM W 61708