NTN 4T-78250/78551 Bearing

Part Number	4T-78250/78551
Brand	NTN
Type	Tapered roller bearings Inch series
Mass	2.54 kg
Boundary dimensions (mm)
Inner dia. (d)	63.5
Outer dia. (D)	140.03
Width (B)	33.24
ras max	2.3
Basic load ratings (kN)
Dynamic (Cr)	171
Static (Cor)	212
Basic load ratings (kgf)
Dynamic (Cr)	17400
Static (Cor)	21600
Limiting speed (min-1)
Grease	2600
Oil	3400

As for the maximum value for inner and outer ring diameters of bearings whose bearing numbers are marked with "+" (inner ring) and "++" (outer ring), the precision class is an integer for class 4 and class 2 bearings only. Bearings with a # symbol next to the serial number are J-series bearings, and have a different tolerance to other series. For more details, see “Bearing Tolerance” listed in the “NTN ‘Ball and Roller Bearings’ Catalog.”

Nodes have NTN 4T-78250/78551 bearings in stock. Tapered roller bearings (Inch series), are designed so the inner and outer ring raceway and the apex of the tapered rollers intersect at one point on the bearing centerline.