Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial Timken 78255D - 78551

Описание

TDI bearings have a one-piece double inner race and two single outer races and are typically supplied complete with an outer race spacer as a pre-set assembly. The bearing can be used at fixed positions on rotation shaft applications. For rotating housing application it can be used to float on the stationary shaft. 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 2.5586 in D - Cup Outer Diameter 5.5130 in B - Double Cone Width 2.5980 in C - Cup Width 0.9260 in T - Bearing Width across Cups 2.6020 in Abutment and Fillet Dimensions R - Cone Backface "To Clear" Radius1 0.06 in r - Cup Backface "To Clear" Radius2 0.090 in da - Cone Frontface Backing Diameter 3.11 in Db - Cup Backface Backing Diameter 4.61 in Ab - Cage-Cone Frontface Clearance 0.08 in Basic Load Ratings C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 9970 lbf C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 66900 lbf C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 17400 lbf Ca90- Dynamic Thrust Rating (90 million revolutions)6 14800 lbf 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 Spacer Note Spacer shows standard nominal .01 radii, actual bearing may vary