TIMKEN M278748D-902A4

Tapered roller bearings technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available

Bore diameterd: 571.5 mm
Outside diameterD: 812.8 mm
WidthB: 285.75 mm
Dynamic load ratingC: 9050 kN
Static load ratingC0: 21100 kN
Mass≈m: 500.67 kg

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Technical data

Product specifications

Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.

Core specifications11 parameters

Core specifications
Parameter	Symbol	Value
Series		M278700
Variant / construction		TDI - Tapered Double Inner
Bore diameter	d	571.5 mm
Outside diameter	D	812.8 mm
Width	B	285.75 mm
Basic dynamic load rating	C	9050 kN
Basic static load rating	C0	21100 kN
Mass	≈m	500.67 kg
Precision class		ABMA Class 2
Sealing		Open
Cage		Steel cage

Calculation Factors6 parameters

Calculation Factors
Parameter	Symbol	Value
K Factor		1.76
Y1 Factor		2.03
Y2 Factor		3.02
Y0 Factor		1.98
E Factor		0.33
Cg Factor		0.2990

Manufacturer Identity9 parameters

Manufacturer Identity
Parameter	Symbol	Value
Brand		Timken
Material Number		000000000190039057
World Assembly Part Number		M278748D_M278710
Inner Ring Part Number		M278748D
Outer Ring Part Number		M278710
Drawing Number		E-32879
Upc		0013992372017
Official Source System		CORE BP - DS DF
Official Last Run		2026-08-23T20:02:48.497

Product Identity4 parameters

Product Identity
Parameter	Symbol	Value
Type Description		TDI - Tapered Double Inner
Construction		Double Row Tapered Roller Bearing Assembly \| Imperial Series \| 22.5000 in Bore \| 32.0000 in OD \| 11.2500 in Width \| Open \| Cylindrical Bore \| Steel Cage \| Precision ABMA Class 2
Number Of Rows		2
Tapered Bore		N

Technical Data10 parameters

Technical Data
Parameter	Symbol	Value
Overall Width		0.000 mm
Radial Rating		2,350,000 N
Axial Rating		767,000 N
Dynamic Rating C1		9,050,000 N
Dynamic Rating C90		2,350,000 N
Dynamic Axial Rating Ca90		767,000 N
Dynamic Axial Rating Ca1		2,960,000 N
Static Radial Rating C0		21,100,000 N
Extended Dynamic Rating Ce		0 N
Static Axial Rating C0A		10,200,000 N

Technical documents & data sheet

This product page is a BearingScope catalogue reference, not a manufacturer-certified drawing. Preserve the full brand and designation when comparing files.

Record identity: TIMKEN M278748D-902A4
Document matching: Exact designation, assembly scope, revision and units must agree.

No verified redistributable CAD or manufacturer PDF is registered for this exact model. A catalogue image is not a dimensioned drawing. Missing technical files are not generated or replaced with unrelated models.

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