SIFT BEARING STORE CATALOG

3977/3920TimkenTapered Roller

3977/3920 is a Timken tapered roller bearing, bore 60 mm, O.D. 112.71 mm, width 30.05 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d60mm
Outside dia. D112.71mm
Width B30.05mm
Dynamic Cr139kN
Static C0r191kN
Weight1.31kg
Cr / C0r0.73
Mean dia. dm86.4mm

Original catalogue drawing - Timken TRB Catalog, page 230

3977/3920 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 d60 mmWidth B30.05 mmCup width C23.81 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 diameter602.3622
DOutside diameter112.7124.4375
BInner-ring / bearing width30.0481.183
TOverall assembly width30.1621.1875
CCup / outer-ring width23.8120.9375
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)60.000
Bore d (in)2.3622
Outside dia. D (mm)112.712
Outside dia. D (in)4.4375
Width B (mm)30.048
Overall width T (mm)30.162
Overall width T (in)1.1875
Cup width C (mm)23.812

Load ratings & speeds

Basic dynamic load rating Cr (lbs)31200
Basic static load rating Cor (lbs)43000
Basic dynamic load rating Cr (N)139000
Basic static load rating C0r (N)191000
Dynamic rating C1 (N, ISO)139000
Dynamic rating C1 (lbf, ISO)31200
Radial rating C90 (N)36000
Radial rating C90 (lbf)8090
Thrust rating Ca90 (N)24800
Thrust rating Ca90 (lbf)5570
Static rating C0 (N)191000
Static rating C0 (lbf)43000
Factor e0.40
Factor Y1.49
Factor K1.45
Geometry factor G175.2
Geometry factor G221.3
Geometry factor Cg0.1092
Effective load centre a (mm)-4.6

Weight

Weight (kg)1.31

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)3.5
Housing fillet r max (mm)3.3
Shaft shoulder da (mm)68.0
Shaft shoulder db (mm)74.0
Housing shoulder Da (mm)106.0
Housing shoulder Db (mm)99.0
Cage projection Aa (mm)2.2
Cage projection Ab (mm)1.2

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 500 rpm
434,7501023,386
623,16739213,083
817,3751,02434,133
1013,9002,15471,814
159,2678,323277,449

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 139,000 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.230 (dimensions)
Series typeTS

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

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
3977/3919RBTimkenTapered Roller60112.7130.05-1.28
3977/3925TimkenTapered Roller60112.7130.05139 kN1.32

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
3977/3919RBTimkenTapered Roller60112.7130.05-1.28
3977/3925TimkenTapered Roller60112.7130.05139 kN1.32

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
29580/29520TimkenTapered Roller60107.9525.4131 kN0.98
29580/29521TimkenTapered Roller6011025.4131 kN1.05
29582/29522TimkenTapered Roller60107.9525.4131 kN1
30212TimkenTapered Roller6011022107 kN0.88
30312TimkenTapered Roller6013031201 kN1.96
31312TimkenTapered Roller6013031171 kN1.97
32012XTimkenTapered Roller60952396.7 kN0.6
32212TimkenTapered Roller6011028149 kN1.16

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