71908 ACB/HCP4AL - High precision angular contact ball bearing - Precision ball bearing

Product model	71908 ACB/HCP4AL
d	40 mm
D	62 mm
B	12 mm
Limiting speed	50000 r/min
d1	48.46mm
d2	47.6mm
D2	55.64mm
Width of lubricating groove (b)	2mm
C1	5.9mm
Distance from the side of the outer ring to the O-ring(C2)	2.8mm
Distance from the side of the outer ring to the O-ring(C3)	1.7mm
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.60mm
Fillet radius(ra)	max.0.6mm
Fillet radius(rb)	max.0.3mm
Pu	0.122kN
Oil and gas lubrication can reach the speed	32000r/min
Contact angle(α)	25°
Ball diameter(Dw)	3.969mm
The number of pages(z)	28
Reference grease quantity(Gref)	1.38cm³
Preload level A(GA)	31N
Static axial stiffness of preload level A	73N/µm
Preload class B(GB)	62N
Static axial stiffness of preload class B	92N/µm
Preload level C(GC)	185N
Static axial stiffness of preload level C	138N/µm
Correction factor depends on bearing series and size (f)	1.06
The correction factor depends on the contact angle(f1)	0.99
Correction factor, preload class A(f2A)	1
Correction factor, preload class B(f2B)	1.02
Correction factor, preload class C(f2C)	1.08
Correction factor of hybrid ceramic bearing(fHC)	1.01
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	0.11kg

71908 ACB/HCP4AL / High precision angular contact ball bearing / Precision ball bearing