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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 |
|---|---|
| MPN | 74555 |
| Model | 74555 |
| Bearing Type | Tapered Roller Bearing Cone, Open |
| ID | 5.5000 in |
| Width | 1.1875 in |
| Material | Bearing Steel |
|---|---|
| Series | 74000 |
| Condition | New – Open box |
| 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 |
| Condition Note | Made In USA, New Old Stock, Stained, We Have The Parts To Make Complete Timken Sets Or Assemblies For Any Part Number, Contact Us |
| Bore Shaft Size | 5-1/2 inch (straight bore) |
| Mpn Variants | 74555, 74555 cone, 745-55, Timken 74555 |
| Additional Attributes | Cone only - cup sold separately; cone and cup must be a matched pair. New old stock with storage staining. |
| Min Temp | -40°C |
| Cage Type | Stamped |
| Precision Rating | Class 2 |
| Rolling Elements | Tapered Roller |
| Max Temp | 120°C |
| Item Weight | 2.10 lbs |
| Cage Material | Steel |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.20.00.00 |
| Design Units | Inch |
| Part Number | 74555 |
| Cross Reference 1 | 74555 tapered roller bearing cone |
|---|
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, straightSeries: inch, Timken 74555Rows: singleBearing type: tapered roller
One cone. If the machine uses two opposed tapered roller bearings, each position needs its own cone and cup.
Read the number stamped on the cup already in the housing and match this cone to that number rather than assuming a mate. On a 5-1/2 inch bore the interference fit is substantial — heat the cone for mounting rather than pressing it cold, and never drive mounting force through the rollers. Tapered roller bearings have no built-in internal clearance: end play or preload has to be established at assembly to the machine builder’s figure using shims, a spacer or the adjusting nut. Inspect the rollers and cage before fitting; a nicked roller or a distorted cage makes the cone scrap.
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 — but inspect the roller and raceway surfaces on arrival as you would with any stored bearing.
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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