Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial Timken NA78250 - 78549D
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Описание
NA78250 Specifications Cone Part Number NA78250 Cup Part Number 78549D Related Assembly Number(s) NA78250-90032 Design Unit Inch Dimensions d - Bore 2 1/2 in D - Cup Outer Diameter 5.5000 in T - Bearing Width across Cones 3.0625 in C - Double Cup Width 2.0395 in Abutment and Fillet Dimensions R - Cone Backface "To Clear" Radius1 0.09 in r - Cup Backface "To Clear" Radius2 0.06 in db - Cone Backface Backing Diameter 3.35 in Da - Cup Frontface Backing Diameter 5.19 in Basic Load Ratings C90 - Dynamic Radial Rating (90 million revolutions)3 11800 lbf C1 - Dynamic Radial Rating (1 million revolutions)4 79300 lbf Ca90- Dynamic Thrust Rating (90 million revolutions)5 17500 lbf C90(2)- Dynamic Radial Rating (Two-Row, 90 million revolutions)6 20600 lbf Factors K - Factor7 0.67 e - ISO Factor8 0.87 Y1 - ISO Factor9 0.78 Y2 - ISO Factor10 1.16