30208 Single Row Tapered Roller Bearing

30208 Single Row Tapered Roller Bearing | Technical Overview

30208 is a metric single-row tapered roller bearing in the 302 series. The nominal bore is 40 mm, outside diameter 80 mm and assembled bearing width 19.75 mm. The individual inner-ring and outer-ring widths are 18 mm and 16 mm respectively. Use the five dimensions together when comparing a replacement or evaluating an equipment design.

Nominal Boundary Dimensions

Nominal reference dimensions only. Verify specification and available supply against the approved technical record before ordering.

Envelope and Interchange Checks

The radial section calculated from the nominal diameters is 20 mm per side. For this 40 mm shaft size, confirm there is adequate room for the 80 mm outside diameter and the 19.75 mm assembled axial envelope. The 302 family has general metric envelope; the dimensions themselves do not establish a particular load rating, service life or interchange approval.

Start the dimensional check with the shaft seat and housing bore rather than the bearing designation alone. Check the ring designation, chamfer allowances, shoulder clearances, required tolerance class and cage design if a direct replacement is intended. Two bearings sharing d, D, B, C and T are not automatically identical in internal geometry or performance.

Construction and Load Direction

The tapered roller and raceway geometry is intended to support combined radial and axial loading within an engineered arrangement. The cone assembly (inner ring, rollers and cage) is separate from the cup (outer ring), which can simplify certain mounting operations. A single row normally supports axial force predominantly in one direction; the full arrangement must address force in the opposite direction.

Mounting, Preload and Lubrication

A single-row tapered roller bearing transmits thrust primarily in one direction; the opposing direction is normally supported by another bearing. Use the approved assembly procedure to check the final setting, shaft and housing fits, ring seating and bearing alignment. Excessive preload can generate heat, while uncontrolled clearance can affect guidance and load distribution.

Specify grease or oil based on the actual speed, temperature, duty cycle, contamination exposure and maintenance approach. This listing does not assign a rated speed, grease grade, clearance or lubrication interval without a verified design-specific source.

Applications to Evaluate

The 302 design family can be considered for shaft supports and gear housings where the combined load and mounting space have been calculated. Actual applicability of 30208 depends on calculated equivalent loads, required bearing life, shaft geometry, sealing conditions, assembly adjustment and the surrounding machine design. No equipment-specific approval is implied by the model number alone.

Request a BEARVEX Quotation

Please send the model 30208, required quantity, destination country, operating load and speed, shaft/housing dimensions, requested accuracy class, lubrication conditions and desired lead time. If available, add a drawing or a photo of the existing part and note whether you require a complete cone-and-cup set. BEARVEX will confirm the exact configuration, technical data, quality requirements, packaging and export details before quotation.