TIMKEN NP578395-90KA2

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

Technical data available

Bore diameterd: 938.212 mm
Outside diameterD: 1270 mm
WidthB: 406.2 mm
Dynamic load ratingC: 12600 kN
Static load ratingC0: 30300 kN
Mass≈m: 1361.12 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		EX27748
Variant / construction		TDO - Tapered Double Outer
Bore diameter	d	938.212 mm
Outside diameter	D	1270 mm
Width	B	406.2 mm
Basic dynamic load rating	C	12600 kN
Basic static load rating	C0	30300 kN
Mass	≈m	1361.12 kg
Precision class		ABMA Class K
Sealing		Open
Cage		Steel cage

Calculation Factors6 parameters

Calculation Factors
Parameter	Symbol	Value
K Factor		0.67
Y1 Factor		0.78
Y2 Factor		1.16
Y0 Factor		0.76
E Factor		0.87
Cg Factor		0.4847

Manufacturer Identity8 parameters

Manufacturer Identity
Parameter	Symbol	Value
Brand		Timken
Material Number		000000000190069325
World Assembly Part Number		NP578395_NP508551
Inner Ring Part Number		NP578395
Outer Ring Part Number		NP508551
Drawing Number		E-50860
Official Source System		CORE BP - DS DF
Official Last Run		2026-08-23T20:02:48.503

Product Identity4 parameters

Product Identity
Parameter	Symbol	Value
Type Description		TDO - Tapered Double Outer
Construction		Double Row Tapered Roller Bearing Assembly \| Imperial Series \| 36.9375 in Bore \| 50.0000 in OD \| 15.9921 in Width \| Open \| Cylindrical Bore \| Steel Cage \| Precision ABMA Class K
Number Of Rows		2
Tapered Bore		N

Technical Data10 parameters

Technical Data
Parameter	Symbol	Value
Overall Width		0.000 mm
Radial Rating		3,250,000 N
Axial Rating		2,770,000 N
Dynamic Rating C1		12,600,000 N
Dynamic Rating C90		3,250,000 N
Dynamic Axial Rating Ca90		2,770,000 N
Dynamic Axial Rating Ca1		10,700,000 N
Static Radial Rating C0		30,300,000 N
Extended Dynamic Rating Ce		0 N
Static Axial Rating C0A		38,200,000 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 NP578395-90KA2
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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