TIMKEN NP139161-902A1

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

Technical data available

Bore diameterd: 260.35 mm
Outside diameterD: 422.275 mm
WidthB: 178.592 mm
Dynamic load ratingC: 2530 kN
Static load ratingC0: 3860 kN
Mass≈m: 86.25 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		HM252300
Variant / construction		TDO - Tapered Double Outer
Bore diameter	d	260.35 mm
Outside diameter	D	422.275 mm
Width	B	178.592 mm
Basic dynamic load rating	C	2530 kN
Basic static load rating	C0	3860 kN
Mass	≈m	86.25 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		0.1465

Manufacturer Identity9 parameters

Manufacturer Identity
Parameter	Symbol	Value
Brand		Timken
Material Number		000000000190036382
World Assembly Part Number		NP139161_HM252310CD
Inner Ring Part Number		NP139161
Outer Ring Part Number		HM252310CD
Drawing Number		C-87424
Upc		0013992417794
Official Source System		CORE BP - DS DF
Official Last Run		2026-08-23T20:02:48.493

Product Identity4 parameters

Product Identity
Parameter	Symbol	Value
Type Description		TDO - Tapered Double Outer
Construction		Double Row Tapered Roller Bearing Assembly \| Imperial Series \| 10.2500 in Bore \| 16.6250 in OD \| 7.0312 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		655,000 N
Axial Rating		214,000 N
Dynamic Rating C1		2,530,000 N
Dynamic Rating C90		655,000 N
Dynamic Axial Rating Ca90		214,000 N
Dynamic Axial Rating Ca1		826,000 N
Static Radial Rating C0		3,860,000 N
Extended Dynamic Rating Ce		0 N
Static Axial Rating C0A		1,870,000 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 NP139161-902A1
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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