SIFT BEARING STORE CATALOG

28980/28921DTimkenTapered Roller

28980/28921D is a Timken tapered roller bearing, bore 59.98 mm, O.D. 100 mm, height 55.56 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d59.98mm
Outside dia. D100mm
Overall width T55.56mm
Dynamic Cr185kN
Weight1.67kg
Mean dia. dm80mm

Original catalogue drawing - Timken TRB Catalog, page 532

28980/28921D 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. D100 mmBore d59.98 mmOverall width T55.56 mmCup width C44.45 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 diameter59.9772.3613
DOutside diameter1003.937
TOverall assembly width55.562.1874
CCup / outer-ring width44.451.75
rChamfer (min)0.80.0315

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)59.977
Bore d (in)2.3613
Outside dia. D (mm)100.000
Outside dia. D (in)3.9370
Overall width T (mm)55.560
Overall width T (in)2.1874
Cup width C (mm)44.450
Cup width C (in)1.7500

Load ratings & speeds

Basic dynamic load rating Cr (lbs)41500
Basic dynamic load rating Cr (N)185000
Dynamic rating C1 (N, ISO)185000
Dynamic rating C1 (lbf, ISO)41500
Radial rating C90 (N)27500
Radial rating C90 (lbf)6180
Thrust rating Ca90 (N)20000
Thrust rating Ca90 (lbf)4500
Factor e0.43
Factor Y11.59
Factor Y22.36
Factor K1.37
Geometry factor G160.1
Geometry factor G224.5
Geometry factor Cg0.1032

Weight

Weight (kg)1.67

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)3.5
Housing fillet r max (mm)0.8
Shaft shoulder db (mm)73.0
Housing shoulder Da (mm)96.0

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 500 rpm
446,2501023,386
630,83339213,083
823,1251,02434,133
1018,5002,15471,814
1512,3338,323277,449

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 185,000 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.532 (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
28980/28919TimkenTapered Roller59.9899.9825.4-0.76
28980/28921TimkenTapered Roller59.9810025.4106 kN0.75

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
66586/66520TimkenTapered Roller59.98122.2431.75155 kN1.63
66589/66520TimkenTapered Roller59.97122.2431.75-1.65
66589/66522DTimkenTapered Roller59.97129.9869.85319 kN3.94
39236/39412TimkenTapered Roller59.99104.7822115 kN0.74
39236/39433TimkenTapered Roller59.99110.0622115 kN0.86
3977X/3919RBTimkenTapered Roller59.99112.7128-1.26
3977X/3920TimkenTapered Roller59.99112.7128139 kN1.29
3977X/3921XATimkenTapered Roller59.99109.9828139 kN1.2

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