30340 Single Row Tapered Roller Bearing

30340 Single Row Tapered Roller Bearing | Technical Overview

30340 is a metric single-row tapered roller bearing in the 303 series. The nominal bore is 200 mm, outside diameter 420 mm and assembled bearing width 89 mm. The individual inner-ring and outer-ring widths are 80 mm and 67 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 110 mm per side. For this 200 mm shaft size, confirm there is adequate room for the 420 mm outside diameter and the 89 mm assembled axial envelope. The 303 family has relatively substantial outside diameter for the selected bore; the dimensions themselves do not establish a particular load rating, service life or interchange approval.

A replacement assessment should include ring seating, adjacent component clearances and the paired-bearing arrangement. 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

The contact geometry and bearing setting must be assessed at the arrangement level, rather than from the bore alone. 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 303 design family can be considered for industrial transmissions, drive assemblies and heavy-duty shaft supports when the machine designer confirms the load case. Actual applicability of 30340 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 30340, 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.