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Central Surplus Bearing Finder
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1 in stock
Tapered roller bearing cone (inner ring with rollers and cage) for a 4-3/4 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 | 6578 |
| Model | 6578 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 4.7500 in |
| Series | 6500 |
|---|---|
| Base Number | 6578 |
| Industry Terms | Taper bearing cone, tapered roller cone, bearing inner race assembly, taper roller inner, cone only |
| Common Misspellings | Timkin, Timpken, Timken 6587, 6578A, Tinken 6578 |
| Application Types | Gearboxes, pinion and axle shafts, wheel ends, conveyor head shafts, heavy machinery |
| Bore Shaft Size | 4-3/4 inch (straight bore) |
| Mpn Variants | 6578, 6578 cone, 65-78, Timken 6578 |
| Number Of Rows | 1 |
| Harmonization Code | 8482.20.00 |
| Part Number | 6578 |
| Cone Part Number | 6578 |
A Timken 6578 tapered roller bearing cone: the inner ring complete with its tapered rollers and cage, for a 4-3/4 inch straight bore shaft. This is an inch-series industrial cone, the kind used in gearboxes, wheel ends, pinion shafts, conveyor heads and heavy machinery where combined radial and one-way thrust load has to be carried.
Cone only. A tapered roller bearing is a two-piece bearing — 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.
Cone and cup are not independent parts. Timken publishes each cone against the specific cup or cups it is designed to run with, and the pair sets the contact angle, the load ratings and the internal setting of the bearing. Mixing a cone with a cup it was not designed for gives incorrect roller-to-raceway geometry and the bearing will not make its rated life, even if the parts appear to fit. A single tapered roller bearing carries thrust in one direction only, so the shaft normally runs two of them opposed.
Component: cone (inner ring with rollers and cage). Bore: 4-3/4 inch (4.7500 in), straight. Series: inch, Timken 6578. Rows: single. Bearing type: tapered roller. Cage: stamped steel. Bearing class: Class 2. Material: high alloy steel.
One cone. If the machine uses two opposed tapered roller bearings, both positions will need their own cone and cup.
Cross-references cover the 6578 designation in its spaced and hyphenated forms. Note the distinction that catches buyers out: a cone number, a cup number and a complete assembly number are three different things. Timken numbers with a -90xxx suffix are complete assemblies, not cones. If a full bearing is needed rather than a replacement inner, that is a different part number.
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A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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