Part Number 6321, Tapered Roller Bearings - Single Cups

This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.

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Unit of Measure

Key Dimensions | Other Dimensions | Factors

Key Dimensions

Cup Part Number	N/A 6321
O.D. (D)	N/A 5.1875 in131.763 mm
Outer Ring Width (C)	N/A 1.7500 in44.450 mm
e Factor ¹	N/A 0.32

Other Dimensions

Weight	N/A 3.2 Kg7.2 lb
Max Housing Fillet Radius²	N/A 0.130 in3.30 mm
Housing Backing Shoulder Dia. - Frontface (Da)	N/A 4.96 in125 mm
Housing Backing Shoulder Dia. - Backface (Db)	N/A 4.53 in115.06 mm

Factors

Geometry Factor (Cg)³

N/A 0.0827

¹ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
² These maximum fillet radii will be cleared by the bearing corners.
³ Geometry constant for Lubrication Life Adjustment Factor a3l.

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Key Dimensions

Cup Part Number

O.D. (D)

Outer Ring Width (C)

Other Dimensions

Weight

Housing Backing Shoulder Dia. - Frontface (Da)

Housing Backing Shoulder Dia. - Backface (Db)

Factors