L45449-410 bearing: complete specifications & equivalents
The L45449-410 is a ISO 355 radial bearing sized 29 x 50.292 x 14.224 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 29 mm |
| Outer diameter D | 50.292 mm |
| Width B | 14.224 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 31.8 kN |
| Basic static load rating C0 | 32.5 kN |
| Fatigue load limit Pu | 3.35 kN |
| Reference speed (thermal) | 11000 rpm |
| Limiting speed (mechanical) | 13000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 110 g |
| Manufacturer designation | SKF L 45449/410 |
| 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 & L45400-series range
| Bore d | 1.142 in |
|---|---|
| Outer diameter D | 1.98 in |
| Width B | 0.56 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 10.6 mm |
| Smallest bore in L45400-series | 29 mm |
| Largest outer diameter in L45400-series | 50.292 mm |
| Width range across L45400-series | 14.224–14.224 mm |
| Bore position in L45400-series (smallest first) | 1 of 1 |
| Bore above smallest L45400-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L45449-L45410 | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| L45449-410 | 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 L45449-410 model number is decoded
Operating context for the 29 mm bore: a shaft of this diameter in the medium-bore band typically runs between 23200 and 34800 r/min in real machinery, and the 50.292 mm outside diameter places the housing shoulder at 58 mm outer abutment; the 14.224 mm width and 110 g mass together set the shaft critical speed and the housing resonance check for this L4500-series envelope. Cone versus cup responsibility in L45449: the L 45449 cone carries the 29 mm bore, rollers and pressed-steel cage; the 410 cup carries the 50.292 mm OD raceway, the roller-seating rib and the outer press-fit surface. The two references are not interchangeable halves.L45449 is a single-row tapered roller bearing in the L45400-series inch series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.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 (L45400-series) ties the pair to a specific boundary plan. Dimensions 29×50.292×14.224 mm are the converted metric envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 11,000 r/min thermal reference and 13,000 r/min mechanical limiting speed. A single L45449 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.
Typical equipment & failure modes
Common applications
- pump and compressor shafts
- machine-tool spindles
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
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
- roller large-end smearing against the cone rib after EP lubricant film failure
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- On this 29 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight L45449 pair heats, loses setting control and smears the roller-rib contact.
- The L45400-series inch series at 29 mm bore (50.292×14.224 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.
- Setting is a design value, not an assembly feel: excessive preload in the L45449 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Setting is a design value, not an assembly feel: excessive preload in the L45449 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 50.292 mm cup race release as noise within the first running hours.
- The 31.8/32.5 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 L45449 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 45449/410 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit L45449?
For a rotating shaft under normal load, seat the cone on a k5 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 14.224 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 L45449 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 L45449?
The SKF L 45449/410 is a single-row tapered roller bearing with 29 mm bore, 50.292 mm outer diameter and 14.224 mm width (1.142 × 1.98 × 0.56 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 31.8 kN, C0 32.5 kN, fatigue load limit Pu 3.35 kN, reference speed 11,000 r/min, limiting speed 13,000 r/min, mass about 110 g. It is an open, separable bearing with a pressed-steel cage.
How does the L45449 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 L45400-series code marks the dimensional series. The metric dimensions 29×50.292×14.224 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in L45449 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (L45400-series) groups sizes that share the same boundary-dimension plan.
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.