SIFT BEARING STORE CATALOG

78255X/78537TimkenTapered Roller

78255X/78537 is a Timken tapered roller bearing, bore 64.99 mm, O.D. 136.53 mm, width 32.92 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly
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Bore d64.99mm
Outside dia. D136.53mm
Width B32.92mm
Weight2.22kg
Mean dia. dm100.8mm

Original catalogue drawing - Timken - Single Row

78255X/78537 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. D136.53 mmBore d64.99 mmWidth B32.92 mmCup width C23.52 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 diameter64.9882.5586
DOutside diameter136.5255.375
BInner-ring / bearing width32.9231.2962
TOverall assembly width36.5131.4375
CCup / outer-ring width23.520.926
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)64.988
Bore d (in)2.5586
Outside dia. D (mm)136.525
Outside dia. D (in)5.3750
Width B (mm)32.923
Width B (in)1.2962
Overall width T (mm)36.513
Overall width T (in)1.4375
Cup width C (mm)23.520
Cup width C (in).9260

Weight

Cone weight (kg)1.46
Cup weight (kg)0.76
Total weight (kg)2.22

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)3.5
Housing fillet r max (mm)3.3

Source & traceability

BrandTimken
Source catalogueTimken Bearing Dimension Catalog
Catalogue pagep.312 (dimensions) / p.109 (cone) / p.109 (cup)

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

Series variants (different suffix)

DesignationBrandTypedDB/TDyn. ratingkg
78255X/78549DTimkenTapered Roller64.99139.777.79353 kN4.99
78255X/78551TimkenTapered Roller64.99140.0332.92203 kN2.37
78255X/78571TimkenTapered Roller64.99144.9832.92203 kN2.52

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
39586/39520TimkenTapered Roller64.99112.7130.92-1.22
478XA/472TimkenTapered Roller64.9912029.01-1.43
29588/29520TimkenTapered Roller64.99107.9525.4110 kN0.88
39586/39528TimkenTapered Roller64.99119.9830.92167 kN1.55
78255D/78537TimkenTapered Roller64.99136.5365.99298 kN4.55
78255D/78551TimkenTapered Roller64.99140.0365.99298 kN4.91
30213TimkenTapered Roller6512023138 kN1.14
30313TimkenTapered Roller6514033222 kN2.47

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