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Central Surplus Bearing Finder
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Tapered roller bearing cone (inner ring with rollers and cage) for a 5-1/2 inch straight bore shaft, inch series. Cone only — the matching cup is a separate part and is not included. One piece.
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| MFR / Brand | Timken |
|---|---|
| Model | 74555 |
| Bearing Type | Tapered Roller Bearing Cone, Open |
| ID | 5.5000 in |
| Width | 1.1875 in |
| Material | Bearing Steel |
|---|---|
| Series | 74000 |
| Base Number | 74555 |
| Industry Terms | Taper bearing cone, tapered roller cone, bearing inner race assembly, taper roller inner, cone only |
| Common Misspellings | Timkin, Timpken, Timken 74555A, 7455, Tinken 74555 |
| Application Types | Heavy gearboxes, mill and crusher shafts, pinion and axle shafts, conveyor head shafts |
| Bore Shaft Size | 5-1/2 inch (straight bore) |
| Mpn Variants | 74555, 74555 cone, 745-55, Timken 74555 |
| Rolling Elements | Tapered Roller |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Harmonization Code | 8482.20.00.00 |
| Part Number | 74555 |
A Timken 74555 tapered roller bearing cone: the inner ring complete with its tapered rollers and cage, for a 5-1/2 inch straight bore shaft. This is a large inch-series industrial cone, the sort used in heavy gearboxes, mill and crusher shafts, pinion and axle positions, conveyor head shafts and other places where high radial load arrives together with one-way thrust.
Cone only. A tapered roller bearing is a two-piece assembly — the cone (inner ring, rollers and cage) and the cup (the outer race). This listing is the cone. The cup is a separate part number and is not included. Unless the cup already in the machine is sound and staying put, a cup will be needed too.
Cone and cup are designed as a pair, and the pairing is what sets the bearing’s contact angle, its load ratings and its internal setting. Fitting a cone to a cup it was not designed for gives the wrong roller-to-raceway geometry and the bearing will not reach its rated life even though the parts go together. A single tapered roller bearing takes thrust in one direction only, so shafts normally run two of them opposed, which is also what allows the assembly to be set to a specific end play or preload.
Component: cone (inner ring with rollers and cage).
Bore: 5-1/2 inch (5.5000 in), straight.
Cone width: 1.1875 in.
Series: inch, Timken 74555.
Rows: single.
Bearing type: tapered roller.
Cage: stamped steel.
Precision rating: Class 2.
Mass: 2.10 lbs.
One cone. If the machine uses two opposed tapered roller bearings, each position needs its own cone and cup.
This cone is new old stock and shows surface staining from storage. That is cosmetic discolouration of the preservative on the outside of the part, not raceway damage.
Cross-references cover the 74555 designation in its spaced and hyphenated forms. Keep the three categories distinct: a cone number, a cup number and a complete assembly number are different parts. Timken numbers carrying a -90xxx suffix are complete assemblies rather than cones, so if a full bearing is needed this is not that part number.
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