SIFT BEARING STORE CATALOG

3975/3920TimkenTapered Roller

3975/3920 is a Timken tapered roller bearing, bore 50.8 mm, O.D. 112.71 mm, width 60.1 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d50.8mm
Outside dia. D112.71mm
Width B60.1mm
Dynamic Cr242kN
Weight3.13kg
Mean dia. dm81.8mm

Original catalogue drawing - Timken TRB Catalog, page 700

3975/3920 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 d50.8 mmWidth B60.1 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 diameter50.82
DOutside diameter112.7124.4375
BInner-ring / bearing width60.0962.366
TOverall assembly width60.3252.375

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)50.800
Bore d (in)2.0000
Outside dia. D (mm)112.712
Outside dia. D (in)4.4375
Width B (mm)60.096
Width B (in)2.3660
Overall width T (mm)60.325
Overall width T (in)2.3750

Load ratings & speeds

Basic dynamic load rating Cr (lbs)54300
Basic dynamic load rating Cr (N)242000
Dynamic rating C1 (N, ISO)242000
Dynamic rating C1 (lbf, ISO)54300
Radial rating C90 (N)36000
Radial rating C90 (lbf)8090
Thrust rating Ca90 (N)24800
Thrust rating Ca90 (lbf)5570
Factor e0.40
Factor Y11.68
Factor Y22.50
Factor K1.45

Weight

Weight (kg)3.13

Mounting dimensions (fillets / shoulders)

Shaft shoulder db (mm)61.0
Housing shoulder Da (mm)99.0

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 500 rpm
460,5001023,386
640,33339213,083
830,2501,02434,133
1024,2002,15471,814
1516,1338,323277,449

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 242,000 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.700 (dimensions)
Series typeTS

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

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
3975/3919RBTimkenTapered Roller50.8112.7130.05-1.47

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
18200/18335ETimkenTapered Roller50.88518.26-0.42
18200/18337TimkenTapered Roller50.885.7218.2661.1 kN0.39
18790/18720TimkenTapered Roller50.88517.4654.7 kN0.36
18790/18721TimkenTapered Roller50.883.3117.4654.7 kN0.34
18790/18723TimkenTapered Roller50.888.917.4654.7 kN0.48
18790/18724TimkenTapered Roller50.888.917.4654.7 kN0.42
28580/28520TimkenTapered Roller50.889.9825.498.9 kN0.66
28580/28521TimkenTapered Roller50.892.0825.498.9 kN0.7

Request a quotation for 3975/3920

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