SIFT BEARING STORE CATALOG

3978/3919RBTimkenTapered Roller

3978/3919RB is a Timken tapered roller bearing, bore 59.53 mm, O.D. 112.71 mm, width 30.05 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d59.53mm
Outside dia. D112.71mm
Width B30.05mm
Weight1.3kg
Mean dia. dm86.1mm

Original catalogue drawing - Timken - Single Row

3978/3919RB 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. D112.71 mmBore d59.53 mmWidth B30.05 mmCup width C24.61 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 diameter59.532.3437
DOutside diameter112.7124.4375
BInner-ring / bearing width30.0481.183
TOverall assembly width30.1621.1875
CCup / outer-ring width24.6050.9687
rChamfer (min)3.30.1299

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)59.530
Bore d (in)2.3437
Outside dia. D (mm)112.712
Outside dia. D (in)4.4375
Width B (mm)30.048
Width B (in)1.1830
Overall width T (mm)30.162
Overall width T (in)1.1875
Cup width C (mm)24.605
Cup width C (in).9687

Weight

Cone weight (kg)0.88
Cup weight (kg)0.42
Total weight (kg)1.3

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)1.5
Housing fillet r max (mm)3.3

Source & traceability

BrandTimken
Source catalogueTimken Bearing Dimension Catalog
Catalogue pagep.311 (dimensions) / p.55 (cone) / p.55 (cup)

Dimensions and component weights only - this catalogue publishes no load ratings or speeds.

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
3978/3920TimkenTapered Roller59.53112.7130.05139 kN1.33

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
3978/3920TimkenTapered Roller59.53112.7130.05139 kN1.33

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
65235/65500TimkenTapered Roller59.8812744.45-2.6
745/742TimkenTapered Roller59.93150.0946.67318 kN4.29
66589/66520TimkenTapered Roller59.97122.2431.75-1.65
66589/66522DTimkenTapered Roller59.97129.9869.85319 kN3.94
28980/28919TimkenTapered Roller59.9899.9825.4-0.76
28980/28921TimkenTapered Roller59.9810025.4106 kN0.75
28980/28921DTimkenTapered Roller59.9810055.56185 kN1.67
66586/66520TimkenTapered Roller59.98122.2431.75155 kN1.63

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