TIMKEN HM256849 / HM256810

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

Technical data available

Bore diameterd: 300.038 mm
Outside diameterD: 422.275 mm
WidthB: 82.55 mm
Dynamic load ratingC: 1300 kN
Static load ratingC0: 2770 kN
Mass≈m: 35.51 kg

Compare this model by brand →Check interchange requirements →

Use this page as a technical reference. Verify the current manufacturer specification and the complete application requirements before selection.

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		HM256800
Variant / construction		TS - Tapered Single
Bore diameter	d	300.038 mm
Outside diameter	D	422.275 mm
Width	B	82.55 mm
Basic dynamic load rating	C	1300 kN
Basic static load rating	C0	2770 kN
Mass	≈m	35.51 kg
Precision class		ABMA Class 2
Sealing		Open
Cage		Steel cage

Calculation Factors6 parameters

Calculation Factors
Parameter	Symbol	Value
K Factor		1.73
Y1 Factor		1.78
Y2 Factor		0.00
Y0 Factor		0.98
E Factor		0.34
Cg Factor		0.1779

Manufacturer Identity9 parameters

Manufacturer Identity
Parameter	Symbol	Value
Brand		Timken
Material Number		000000000100374420
World Assembly Part Number		HM256849_HM256810
Inner Ring Part Number		HM256849
Outer Ring Part Number		HM256810
Drawing Number		C-28218
Upc		0053893808949
Official Source System		CORE BP - DS DF
Official Last Run		2026-08-23T20:02:47.673

Product Identity4 parameters

Product Identity
Parameter	Symbol	Value
Type Description		TS - Tapered Single
Construction		Single Row Tapered Roller Bearing Assembly \| Imperial Series \| 11.8125 in Bore \| 16.6250 in OD \| 3.2500 in Width \| Open \| Cylindrical Bore \| Steel Cage \| Precision ABMA Class 2
Number Of Rows		1
Tapered Bore		N

Technical Data10 parameters

Technical Data
Parameter	Symbol	Value
Overall Width		93.250 mm
Radial Rating		336,000 N
Axial Rating		194,000 N
Dynamic Rating C1		1,300,000 N
Dynamic Rating C90		336,000 N
Dynamic Axial Rating Ca90		194,000 N
Dynamic Axial Rating Ca1		748,000 N
Static Radial Rating C0		2,770,000 N
Extended Dynamic Rating Ce		0 N
Static Axial Rating C0A		2,710,000 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 HM256849 / HM256810
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.

Look up another model or check drawing requirements →

Previous product← TIMKEN HM231149-99403 Tapered roller bearing

Next productTIMKEN HM516449A / HM516410 Tapered roller bearing →