KOYO HK2018RS Needle Non Thrust Roller Bearings

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KOYO HK2018RS Needle Non Thrust Roller Bearings image

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SKF Roller bearings Specification details

Bearing number:71909 CB/HCP4A
Size (mm):68x45x12
Bore Diameter (mm):68
Outer Diameter (mm):45
Width (mm):12
d:45 mm
D:68 mm
B:12 mm
d1:53.45 mm
d2:52.4 mm
D2:61.8 mm
r1,2 - min.:0.6 mm
r3,4 - min.:0.3 mm
a:16.1 mm
da - min.:48.2 mm
db - min.:48.2 mm
Da - max.:64.8 mm
Db - max.:66 mm
ra - max.:0.6 mm
rb - max.:0.3 mm
dn:54.2 mm
Basic dynamic load rating - C:7.4 kN
Basic static load rating - C0:5.7 kN
Fatigue load limit - Pu:0.245 kN
Limiting speed for grease lubrication:32000 r/min
Limiting speed for oil lubrication:50000 mm/min
Ball - Dw:4.762 mm
Ball - z:27
Gref:1.75 cm3
Calculation factor - f0:9.7
Preload class A - GA:24 N
Preload class B - GB:48 N
Preload class C - GC:145 N
Calculation factor - f:1
Calculation factor - f2A:1
Calculation factor - f2B:1.03
Calculation factor - f2C:1.08
Calculation factor - fHC:1.01
Preload class A:32 N/micron
Preload class B:41 N/micron
Preload class C:66 N/micron
r1,2 min.:0.6 mm
r3,4 min.:0.3 mm
da min.:48.2 mm
db min.:48.2 mm
Da max.:64.8 mm
Db max.:66 mm
ra max.:0.6 mm
rb max.:0.3 mm
Basic dynamic load rating C:9.95 kN
Basic static load rating C0:9.65 kN
Fatigue load limit Pu:0.245 kN
Attainable speed for grease lubrication:32000 r/min
Attainable speed for oil-air lubrication:50000 r/min
Ball diameter Dw:4.762 mm
Number of balls z:27
Reference grease quantity Gref:1.75 cm³
Preload class A GA:24 N
Static axial stiffness, preload class A:32 N/µm
Preload class B GB:48 N
Static axial stiffness, preload class B:41 N/µm
Preload class C GC:145 N
Static axial stiffness, preload class C:66 N/µm
Calculation factor f:1.08
Calculation factor f1:1
Calculation factor f2A:1
Calculation factor f2B:1.03
Calculation factor f2C:1.08
Calculation factor fHC:1.01
Calculation factor f0:9.7
Mass bearing:0.13 kg

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