30315 Tapered Roller Bearing (75x160x40mm)
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Bearing dimensions and basic technical information.
Dimension Notes
For tapered roller bearings the width above is the overall width T = 40 mm. The inner-ring width B (and the cup width C) are printed by each manufacturer and appear with the brand values below.
Manufacturer Ratings
Load-rating symbols are printed as each manufacturer writes them in its own catalogue, so the same quantity can carry a different symbol from brand to brand.
| Brand | Dynamic Load Rating | Static Load Rating | Fatigue Load Limit | Additional Data |
|---|---|---|---|---|
| SKF 30315 | 301 kN | 290 kN | 34 kN | — |
| NSK HR30315DJ | 259 kN | 251 kN | — | — |
| Schaeffler (FAG) 30315-A | 250 kN | 295 kN | 35 kN | — |
| NTN 30315DU | 238 kN | 256 kN | 29.8 kN | — |
| Timken 30315 | 299 kN | 338 kN | — | Dynamic Radial Rating, 90×10⁶ rev (C90): 77.5 kN · Dynamic Thrust Rating, 90×10⁶ rev (Ca90): 45.8 kN · Geometry Factor (Cg): 0.0841 |
Speed Ratings
Speed limits depend on sealing and lubrication, and definitions differ by manufacturer. Contact-sealed variants are normally greased for life and run slower. Always confirm the exact variant in the manufacturer's table.
| Brand | Grease open / shielded | Oil open | Reference | Limiting |
|---|---|---|---|---|
| SKF 30315 | — | — | 3,400 r/min | 4,300 r/min |
| NSK HR30315DJ | 2,200 r/min | 3,000 r/min | — | — |
| Schaeffler (FAG) 30315-A | — | — | 3,400 r/min | 4,600 r/min |
| NTN 30315DU | 2,100 r/min | 2,800 r/min | — | — |
| Timken 30315 | — | — | — | — |
References
- SKF — SKF Group, Rolling Bearings, PUB BU/P1 17000/1 EN, Oct. 2018.
- NSK — NSK Ltd., Rolling Bearings for Industrial Machinery, CAT. No. E1103, Tokyo, Japan, Jan. 2025.
- Schaeffler (FAG) — Schaeffler Technologies AG & Co. KG, Rolling Bearings, HR 1, Herzogenaurach, Germany, Feb. 2025.
- NTN — NTN Corporation, Ball and Roller Bearings, CAT. No. 2203-3E, Osaka, Japan, Sep. 2000.
- Timken — The Timken Company, Tapered Roller Bearing Catalog, North Canton, OH, USA.
About This Type
Tapered roller bearings carry combined radial and axial loads in one axial direction. Because a radial load induces an axial component, they are almost always mounted in opposed pairs. Typical applications include vehicle wheel hubs, gearboxes and differentials, conveyor rollers, agricultural and construction machinery, and machine-tool spindles.
Because a single bearing carries axial load in one axial direction only, two bearings are mounted back-to-back or face-to-face so that each carries the axial load in its own axial direction. For a given bore size, a heavier dimension series (for example 303 instead of 302) provides higher load ratings at the cost of limiting speed and envelope size, while a large-contact-angle series such as 313 is chosen when the axial share of the load is high. The CN/C2/C3 radial-clearance groups do not apply to single-row tapered roller bearings: running clearance or preload is set by the mounting adjustment, not by a clearance suffix.
The cone (inner ring with rollers) and the cup (outer ring) are separable and are mounted separately. Axial clearance or preload is set during installation — by shims, a shaft nut, or a threaded adjustment — and largely determines bearing life: too loose runs noisily and wears faster; too tight overheats. Cones and cups are matched sets; do not interchange parts between bearings, and recheck the setting after the first few hours of operation.
Series note: The 303 series has a heavier cross-section than the 302 series for the same bore: higher load ratings, lower limiting speed.
Related Guides
Disclaimer: Data on this page is compiled from publicly available online sources for reference only, and not every model appears in a manufacturer's published catalog. Values may differ between sources and editions — always verify against the manufacturer's current documentation before design or purchase.Full disclaimer →