Timken 78255D – 78551
Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial
(BRAND)：TIMKEN
(Availability)：In Stock
Specifications
Series
78000
Cone Part Number
78255D
Cup Part Number
78551
Design Unit
Inch
Cage Material
Stamped Steel
Related Assembly Number(s)
78255D-90077
Dimensions
d - Bore
64.988 mm
D - Cup Outer Diameter
140.030 mm
B - Double Cone Width
65.989 mm
C - Cup Width
23.520 mm
T - Bearing Width across Cups
66.091 mm
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius1
1.5 mm
r - Cup Backface "To Clear" Radius2
2.29 mm
da - Cone Frontface Backing Diameter
78.95 mm
Db - Cup Backface Backing Diameter
117.09 mm
Ab - Cage-Cone Frontface Clearance
2 mm
Basic Load Ratings
C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3
44300 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4
298000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5
77200 N
C6
65700 N
Factors
K - Factor7
0.67
e - ISO Factor8
0.87
Y1 - ISO Factor9
0.78
Y2 - ISO Factor10
1.16
Cg - Geometry Factor11
0.0884
