71908 ACD/HCP4A - High precision angular contact ball bearing - Precision ball bearing

Product model	71908 ACD/HCP4A
d	40 mm
D	62 mm
B	12 mm
Limiting speed	38000 r/min
d1	47.1mm
d2	47.1mm
D1	54.9mm
r1,2	min.0.6mm
r3,4	min.0.3mm
a	18mm
da	min.43.2mm
db	min.43.2mm
Da	max.58.8mm
Db	max.60.6mm
Fillet radius(ra)	max.0.6mm
Fillet radius(rb)	max.0.3mm
Fuel injector position(dn)	48.7mm
Pu	0.25kN
Oil and gas lubrication can reach the speed	24000r/min
Contact angle(α)	25°
Ball diameter(Dw)	6.35mm
The number of pages(z)	21
Reference grease quantity(Gref)	1.44cm³
Preload level A(GA)	70N
Static axial stiffness of preload level A	98N/µm
Preload class B(GB)	140N
Static axial stiffness of preload class B	127N/µm
Preload level C(GC)	280N
Static axial stiffness of preload level C	167N/µm
Preload level D(GD)	560N
Static axial stiffness of preload level D	221N/µm
Correction factor depends on bearing series and size (f)	1.09
The correction factor depends on the contact angle(f1)	0.98
Correction factor, preload class A(f2A)	1
Correction factor, preload class B(f2B)	1.07
Correction factor, preload class C(f2C)	1.12
Correction factor, preload class D(f2D)	1.17
Correction factor of hybrid ceramic bearing(fHC)	1.04
Limit value (e)	0.68
Axial load factor (single shaft, tandem shaft)(Y2)	0.87
Axial load factor (single shaft, tandem shaft)(Y0)	0.38
Axial load factor (single shaft, tandem shaft)(X2)	0.41
Axial load factor (back to back, face to face) (Y1)	0.92
Axial load factor (back to back, face to face) (Y2)	1.41
Axial load factor (back to back, face to face) (Y0)	0.76
Radial load factor (back to back, face to face) (X2)	0.67
Weight	0.1kg

71908 ACD/HCP4A / High precision angular contact ball bearing / Precision ball bearing