L357049-010 bearing: complete specifications & equivalents
The L357049-010 is a ISO 355 radial bearing sized 304.8 x 393.7 x 50.8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 304.8 mm |
| Outer diameter D | 393.7 mm |
| Width B | 50.8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 655 kN |
| Basic static load rating C0 | 1220 kN |
| Fatigue load limit Pu | 104 kN |
| Reference speed (thermal) | 1100 rpm |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15000 g |
| Manufacturer designation | SKF L 357049/010 |
| 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 & L357000-series range
| Bore d | 12 in |
|---|---|
| Outer diameter D | 15.5 in |
| Width B | 2 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 44.4 mm |
| Smallest bore in L357000-series | 304.8 mm |
| Largest outer diameter in L357000-series | 393.7 mm |
| Width range across L357000-series | 50.8–50.8 mm |
| Bore position in L357000-series (smallest first) | 1 of 1 |
| Bore above smallest L357000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L357049-010 | 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 L357049-010 model number is decoded
Selection arithmetic: the C0/C ratio is about 1.86 (static 1220 kN against dynamic 655 kN), typical of a tapered roller sized for axial capacity, and the 104 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of L357049 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat. Operating context for the 304.8 mm bore: a shaft of this diameter in the xl-bore band typically runs between 243840 and 365760 r/min in real machinery, and the 393.7 mm outside diameter places the housing shoulder at 402 mm outer abutment; the 50.8 mm width and 15000 g mass together set the shaft critical speed and the housing resonance check for this L3500-series envelope. The cup reference 010 is structural, not a suffix: it identifies the outer ring that, combined with the L 357049 cone, produces the 304.8/393.7/50.8 mm envelope catalogue-listed as L357049. Quote the cup number in full when ordering — the L357000-series tables contain other cups that fit the same cone but change the bearing.The SKF L 357049/010 is a 304.8×393.7×50.8 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.In SKF inch-series tables L357049 sits at 304.8 mm bore (12 in) with a 393.7 mm cup OD and 50.8 mm total width — dimensions that trace back to the original Timken boundary plan for the L357000-series family. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- marine propulsion gearboxes
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
- 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
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 304.8 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 L357000-series inch series at 304.8 mm bore (393.7×50.8 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.
- At the 655 kN rating of L357049, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,400 r/min speed end and heavier preload only where moment stiffness dominates.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common L357049 mounting error.
- 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 393.7 mm cup race release as noise within the first running hours.
- The 655/1220 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 L357049 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 357049/010 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Can a single L357049 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does L357049 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 L357049 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit L357049?
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 50.8 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 L357049 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 L357049?
The SKF L 357049/010 is a single-row tapered roller bearing with 304.8 mm bore, 393.7 mm outer diameter and 50.8 mm width (12 × 15.5 × 2 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 655 kN, C0 1220 kN, fatigue load limit Pu 104 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 15000 g. It is an open, separable bearing with a pressed-steel cage.
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.