LM757049-010 bearing: complete specifications & equivalents
The LM757049-010 is a ISO 355 radial bearing sized 304.8 x 406.4 x 63.5 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 | 406.4 mm |
| Width B | 63.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 775 kN |
| Basic static load rating C0 | 1700 kN |
| Fatigue load limit Pu | 143 kN |
| Reference speed (thermal) | 1100 rpm |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 22500 g |
| Manufacturer designation | SKF LM 757049/010 |
| 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 & LM757000-series range
| Bore d | 12 in |
|---|---|
| Outer diameter D | 16 in |
| Width B | 2.5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50.8 mm |
| Smallest bore in LM757000-series | 304.8 mm |
| Largest outer diameter in LM757000-series | 406.4 mm |
| Width range across LM757000-series | 63.5–63.5 mm |
| Bore position in LM757000-series (smallest first) | 1 of 1 |
| Bore above smallest LM757000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM757049-010 | 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 LM757049-010 model number is decoded
The 143 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 2.19 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Because the contact line is tapered, one LM757049 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 304.8 mm shaft typically takes a m6 seat with an H7 housing bore. Material and manufacturing detail: the 22500 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the LM700 ISO envelope, with the pressed-steel cage contributing roughly 675 g of the total; the 304.8 mm bore is ground to IT5 roundness and the 406.4 mm OD to IT5 cylindricity, and the 63.5 mm width tolerance keeps the pair-setting scatter within the ISO preload class. Two catalogue entries share the LM 757049 cone but use different cups; this one, LM757049, takes the 010 cup and is ground for the resulting 406.4 mm OD / 63.5 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.The SKF LM 757049/010 is a 304.8×406.4×63.5 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 LM757049 sits at 304.8 mm bore (12 in) with a 406.4 mm cup OD and 63.5 mm total width — dimensions that trace back to the original Timken boundary plan for the LM757000-series family. 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.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- large crusher and mineral-processing drives
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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- electrical pitting on VFD-driven shafts without grounding protection
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 LM757000-series inch series at 304.8 mm bore (406.4×63.5 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 775 kN rating of LM757049, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,300 r/min speed end and heavier preload only where moment stiffness dominates.
- At the 775 kN rating of LM757049, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,300 r/min speed end and heavier preload only where moment stiffness dominates.
- Open LM757049 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.
- The 775/1700 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 LM757049 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 757049/010 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Can a single LM757049 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 LM757049 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 LM757049 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM757049?
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 63.5 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 LM757049 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 LM757049?
The SKF LM 757049/010 is a single-row tapered roller bearing with 304.8 mm bore, 406.4 mm outer diameter and 63.5 mm width (12 × 16 × 2.5 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 775 kN, C0 1700 kN, fatigue load limit Pu 143 kN, reference speed 1,100 r/min, limiting speed 1,300 r/min, mass about 22500 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.