SIFT BEARING STORE CATALOG

748/742DTimkenTapered Roller

748/742D is a Timken tapered roller bearing, bore 80 mm, O.D. 155.57 mm, height 101.6 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d80mm
Outside dia. D155.57mm
Overall width T101.6mm
Dynamic Cr553kN
Weight8.38kg
Mean dia. dm117.8mm

Original catalogue drawing - Timken TRB Catalog, page 544

748/742D 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

DdTOutside dia. D155.57 mmBore d80 mmOverall width T101.6 mmCup width C85.72 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 diameter803.1496
DOutside diameter155.5756.125
TOverall assembly width101.64
CCup / outer-ring width85.7253.375
rChamfer (min)1.50.0591

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)80.000
Bore d (in)3.1496
Outside dia. D (mm)155.575
Outside dia. D (in)6.1250
Overall width T (mm)101.600
Overall width T (in)4.0000
Cup width C (mm)85.725
Cup width C (in)3.3750

Load ratings & speeds

Basic dynamic load rating Cr (lbs)124000
Basic dynamic load rating Cr (N)553000
Dynamic rating C1 (N, ISO)553000
Dynamic rating C1 (lbf, ISO)124000
Radial rating C90 (N)82400
Radial rating C90 (lbf)18500
Thrust rating Ca90 (N)45900
Thrust rating Ca90 (lbf)10300
Factor e0.33
Factor Y12.08
Factor Y23.09
Factor K1.80
Geometry factor G1159.6
Geometry factor G226.3
Geometry factor Cg0.0898

Weight

Weight (kg)8.38

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)3.0
Housing fillet r max (mm)1.5
Shaft shoulder db (mm)96.0
Housing shoulder Da (mm)143.0

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 500 rpm
4138,2501023,386
692,16739213,083
869,1251,02434,133
1055,3002,15471,814
1536,8678,323277,449

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 553,000 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.544 (dimensions)
Series typeTDO

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

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
748-S/742TimkenTapered Roller76.2150.0946.67377 kN3.66
748-S/742DTimkenTapered Roller76.2155.57101.6656 kN8.73
748/742TimkenTapered Roller80150.0946.67318 kN3.49
748/743TimkenTapered Roller8015046.67318 kN3.44

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
30216TimkenTapered Roller8014026164 kN1.63
30316TimkenTapered Roller8017039334 kN4.31
31316TimkenTapered Roller8017039271 kN4.06
32016XTimkenTapered Roller8012529166 kN1.27
32216TimkenTapered Roller8014033206 kN2.07
32316TimkenTapered Roller8017058448 kN6.34
33016TimkenTapered Roller8012536210 kN1.61
33116TimkenTapered Roller8013037209 kN1.86

Request a quotation for 748/742D

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