L555249-210 bearing: complete specifications & equivalents
The L555249-210 is a ISO 355 radial bearing sized 292.1 x 374.65 x 47.625 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 292.1 mm |
| Outer diameter D | 374.65 mm |
| Width B | 47.625 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 539 kN |
| Basic static load rating C0 | 1140 kN |
| Fatigue load limit Pu | 98 kN |
| Reference speed (thermal) | 1200 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12500 g |
| Manufacturer designation | SKF L 555249/210 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & L555200-series range
| Bore d | 11.5 in |
|---|---|
| Outer diameter D | 14.75 in |
| Width B | 1.875 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 41.3 mm |
| Smallest bore in L555200-series | 292.1 mm |
| Largest outer diameter in L555200-series | 374.65 mm |
| Width range across L555200-series | 47.625–47.625 mm |
| Bore position in L555200-series (smallest first) | 1 of 1 |
| Bore above smallest L555200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L555249-210 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the L555249-210 model number is decoded
For a 292.1 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two L555249 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Dimensional interchange map: within the L5500 series at 292.1 mm bore, the 374.65 mm OD and 47.625 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 41.3 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 12500 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. Two catalogue entries share the L 555249 cone but use different cups; this one, L555249, takes the 210 cup and is ground for the resulting 374.65 mm OD / 47.625 mm width envelope. Selecting a sibling cup produces a different boundary plan and a different order number, so the full designation is required at purchase.SKF L 555249/210 belongs to the SKF single-row tapered roller range — the 292.1 mm bore entry in the inch L555200-series, dimensioned 374.65 mm OD and 47.625 mm wide.The code breaks down as cone/cup: the numbers before and after the slash identify the inner and outer ring sets, and the series prefix (L555200-series) ties the pair to a specific boundary plan. Dimensions 292.1×374.65×47.625 mm are the converted metric envelope. In SKF suffix language a bare L555249 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 98 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 2.12 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running.
Typical equipment & failure modes
Common applications
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
- wind-turbine main shafts
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- roller large-end smearing against the cone rib after EP lubricant film failure
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- At 292.1 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
- The L555200-series inch series at 292.1 mm bore (374.65×47.625 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of L555249 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- Setting is a design value, not an assembly feel: excessive preload in the L555249 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Shaft and housing fillets must clear the bearing chamfer so the 47.625 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 539/1140 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of L555249 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 555249/210 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does L555249 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load L555249 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit L555249?
For a rotating shaft under normal load, seat the cone on a m6 shaft fit; the cup is usually a loose-to-transition fit in the housing so it can creep slightly and distribute wear. Chamfer and shoulder diameters must clear the bearing rings so the 47.625 mm-wide cup seats square; the mounting setting (end play or preload) is set by the axial position of the cup relative to the cone.
Is L555249 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of L555249?
The SKF L 555249/210 is a single-row tapered roller bearing with 292.1 mm bore, 374.65 mm outer diameter and 47.625 mm width (11.5 × 14.75 × 1.875 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 539 kN, C0 1140 kN, fatigue load limit Pu 98 kN, reference speed 1,200 r/min, limiting speed 1,500 r/min, mass about 12500 g. It is an open, separable bearing with a pressed-steel cage.
How does the L555249 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the L555200-series code marks the dimensional series. The metric dimensions 292.1×374.65×47.625 mm are the converted equivalents of the original inch boundary dimensions.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.