Timken48286-3Tapered Roller Bearing Single Cone – 4.8750 in Bore, 1.5000 in Cone Width, Class 3 Precision, Case-Carburized Steel, Stamped Steel Cage

Product Description

What this part is

Timken 48286-3 tapered roller bearing cone. Cone only: the inner ring with its roller and cage assembly. The matching cup is a Timken 48220, or a Timken 48220-B where a flanged cup is used. Cone Part Number: 48286. Series: 48200. Bore: 4.8750 in. Cone Width: 1.5000 in. Precision Class: Class 3. Design Units: Imperial. Cage Type: Stamped steel. Bearing Material: Case-carburized steel. Harmonization Code: 8482.20.00. Country of Origin: United States. Condition: new old stock with surface staining.

Decoding the designation

48286 is the Timken cone number in the 48200 inch series. The trailing 3, written as -3 or *3 on the carton, is Precision Class: Class 3 — a tighter tolerance than standard, giving lower running vibration and closer shaft location. The searchable forms of the number are 48286-3, 48286 *3, 48286 #3 and plain 48286.

What these specs mean in practice

Cone Frontface Backing Diameter: 5.24 in. Cone Backface To-Clear Radius: 0.14 in. Cage-Cone Frontface Clearance: 0.15 in. Cage-Cone Backface Clearance: 0.06 in. Effective Center Location: -0.22 in. Those figures set the mounting envelope: the backing shoulder on the shaft must not exceed 5.24 in, a shaft fillet at or under 0.14 in clears the cone backface, and the two cage clearances give the axial room the cage needs at each end. The effective centre location of -0.22 in is where the load line crosses the shaft axis, and it is the figure a bearing-spacing calculation uses. Case-carburized steel gives a hard raceway over a tough core, which is what lets a tapered roller cone take shock loading. The stamped steel cage keeps rotating mass low and leaves open paths for grease or oil between the rollers.

Quantity and configuration

Unit Quantity: 1 Pc. One cone assembly ships: inner ring, rollers and cage as a unit. Carton and cross designations, all recorded as search terms: 48286-3, 48286 *3, 48286 #3, 48286 3, 48286.

Fitting notes

The cone presses onto the shaft and the mating cup presses into the housing. Setting is by axial adjustment between the two, so the cup and cone are positioned against each other on assembly rather than clamped independently.

Interchange guidance

Matching cups: Timken 48220 (single cup) and Timken 48220-B (flanged single cup). A plain 48286 with no suffix is a related version at standard tolerance rather than Class 3. A 48290 is a related size in the same 48200 series at a different bore.