TIMKEN B-8839-C

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

Technical data available

Bore diameterd: 317.5 mm
Outside diameterD: 558.8 mm
WidthB: 254 mm
Dynamic load ratingC: 3980 kN
Static load ratingC0: 6380 kN
Mass≈m: 239.66 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		NTS-413794
Variant / construction		TDO - Tapered Double Outer
Bore diameter	d	317.5 mm
Outside diameter	D	558.8 mm
Width	B	254 mm
Basic dynamic load rating	C	3980 kN
Basic static load rating	C0	6380 kN
Mass	≈m	239.66 kg
Precision class		ABMA Class 2
Sealing		Open
Cage		Steel cage

Calculation Factors6 parameters

Calculation Factors
Parameter	Symbol	Value
K Factor		0.51
Y1 Factor		0.59
Y2 Factor		0.88
Y0 Factor		0.58
E Factor		1.14
Cg Factor		0.2398

Manufacturer Identity9 parameters

Manufacturer Identity
Parameter	Symbol	Value
Brand		Timken
Material Number		000000000190035108
World Assembly Part Number		NP186028_NP770805
Inner Ring Part Number		NP186028
Outer Ring Part Number		NP770805
Drawing Number		E-53227
Upc		0087796094383
Official Source System		CORE BP - DS DF
Official Last Run		2026-08-23T20:02:47.75

Product Identity4 parameters

Product Identity
Parameter	Symbol	Value
Type Description		TDO - Tapered Double Outer
Construction		Double Row Tapered Roller Bearing Assembly \| Imperial Series \| 12.5000 in Bore \| 22.0000 in OD \| 10.0000 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		1,030,000 N
Axial Rating		1,160,000 N
Dynamic Rating C1		3,980,000 N
Dynamic Rating C90		1,030,000 N
Dynamic Axial Rating Ca90		1,160,000 N
Dynamic Axial Rating Ca1		4,470,000 N
Static Radial Rating C0		6,380,000 N
Extended Dynamic Rating Ce		0 N
Static Axial Rating C0A		10,600,000 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 B-8839-C
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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