SIFT BEARING STORE CATALOG

M278749/M278710TimkenTapered Roller

M278749/M278710 is a Timken tapered roller bearing, bore 571.5 mm, O.D. 812.8 mm, width 155.57 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d571.5mm
Outside dia. D812.8mm
Width B155.57mm
Dynamic Cr4530kN
Static C0r10600kN
Weight255.86kg
Cr / C0r0.43
Mean dia. dm692.1mm

Original catalogue drawing - Timken TRB Catalog, page 384

M278749/M278710 Timken Tapered Roller bearing catalogue drawing

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

DdBOutside dia. D812.8 mmBore d571.5 mmWidth B155.57 mmCup width C120.65 mm

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

SymbolDimensionmminch
dBore diameter571.522.5
DOutside diameter812.832
BInner-ring / bearing width155.5756.125
TOverall assembly width155.5756.125
CCup / outer-ring width120.654.75
rChamfer (min)6.40.252

Notes

Tapered roller bearings are cone / cup assemblies; cone and cup weights are listed separately and the total is their sum. Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)571.500
Bore d (in)22.5000
Outside dia. D (mm)812.800
Outside dia. D (in)32.0000
Width B (mm)155.575
Overall width T (mm)155.575
Overall width T (in)6.1250
Cup width C (mm)120.650

Load ratings & speeds

Basic dynamic load rating Cr (lbs)1020000
Basic static load rating Cor (lbs)2370000
Basic dynamic load rating Cr (N)4530000
Basic static load rating C0r (N)10600000
Dynamic rating C1 (N, ISO)4530000
Dynamic rating C1 (lbf, ISO)1020000
Radial rating C90 (N)1180000
Radial rating C90 (lbf)264000
Thrust rating Ca90 (N)669000
Thrust rating Ca90 (lbf)150000
Static rating C0 (N)10600000
Static rating C0 (lbf)2370000
Factor e0.33
Factor Y1.80
Factor K1.76
Geometry factor G112425.1
Geometry factor G2669.4
Geometry factor Cg0.2990
Effective load centre a (mm)-11.4

Weight

Weight (kg)255.86
Cup weight (kg)75.91

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)6.4
Housing fillet r max (mm)6.4
Shaft shoulder da (mm)609.0
Shaft shoulder db (mm)615.0
Housing shoulder Da (mm)774.0
Housing shoulder Db (mm)756.0
Cage projection Aa (mm)15.0
Cage projection Ab (mm)5.9

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 500 rpm
41,132,5001023,386
6755,00039213,083
8566,2501,02434,133
10453,0002,15471,814
15302,0008,323277,449

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 4,530,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.

Source & traceability

BrandTimken
Source catalogueTimken Tapered Roller Bearing Catalog (2016)
Catalogue pagep.384 (dimensions) / p.167 (cone) / p.167 (cup)
Series typeTS

ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
M278749/M278710CDTimkenTapered Roller571.5812.8333.387890 kN533.7

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
LL777148/LL777110TimkenTapered Roller571.5660.43.3-21.46
M278748TD/M278710TimkenTapered Roller571.5812.8296.867890 kN520.85
M278749D/M278710TimkenTapered Roller571.5812.8285.757890 kN489.64
NP794398/NP384818TimkenTapered Roller571.5812.8160.324530 kN262.48
EE929225/929341DTimkenTapered Roller565.15863.6317.56960 kN610.33

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