LM11949-910 bearing: complete specifications & equivalents
The LM11949-910 is a ISO 355 radial bearing sized 19.05 x 45.237 x 15.494 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 19.05 mm |
| Outer diameter D | 45.237 mm |
| Width B | 15.494 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 33.8 kN |
| Basic static load rating C0 | 27.5 kN |
| Fatigue load limit Pu | 2.9 kN |
| Reference speed (thermal) | 13000 rpm |
| Limiting speed (mechanical) | 16000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120 g |
| Manufacturer designation | SKF LM 11949/910 |
| 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 & LM11900-series range
| Bore d | 0.75 in |
|---|---|
| Outer diameter D | 1.781 in |
| Width B | 0.61 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.1 mm |
| Smallest bore in LM11900-series | 19.05 mm |
| Largest outer diameter in LM11900-series | 45.237 mm |
| Width range across LM11900-series | 15.494–15.494 mm |
| Bore position in LM11900-series (smallest first) | 1 of 1 |
| Bore above smallest LM11900-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM11949-LM11910 | 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. |
| LM11949-910 | 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 LM11949-910 model number is decoded
The 2.9 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.81 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Specify pairs rather than single units wherever thrust reverses: the tapered contact of LM11949 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat. Dimensional interchange map: within the LM100 series at 19.05 mm bore, the 45.237 mm OD and 15.494 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 13.1 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 120 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. Cone versus cup responsibility in LM11949: the LM 11949 cone carries the 19.05 mm bore, rollers and pressed-steel cage; the 910 cup carries the 45.237 mm OD raceway, the roller-seating rib and the outer press-fit surface. The two references are not interchangeable halves.The SKF LM 11949/910 is a 19.05×45.237×15.494 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.Reading the designation: LM11949 follows the Timken-style inch convention — the cone (inner ring with rollers) and cup (outer ring) are quoted as a pair separated by a slash, and the LM11900-series code identifies the dimensional series. The 19.05 mm bore, 45.237 mm OD and 15.494 mm width are the metric equivalents of the inch boundary dimensions. In SKF suffix language a bare LM11949 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately.
Typical equipment & failure modes
Common applications
- electric-motor pinion shafts
- steering knuckles and small differentials
- agricultural implement hubs
- light-duty gearbox input/output 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
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- 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 a 19.05 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched LM11949 shows up as gearbox vibration long before it fails.
- The LM11900-series inch series at 19.05 mm bore (45.237×15.494 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.
- Do not mix brands or executions inside one LM11949 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
- 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 LM11949 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 45.237 mm cup race release as noise within the first running hours.
- The 33.8/27.5 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 LM11949 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 11949/910 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Can a single LM11949 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 LM11949 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 LM11949 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM11949?
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 15.494 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 LM11949 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 LM11949?
The SKF LM 11949/910 is a single-row tapered roller bearing with 19.05 mm bore, 45.237 mm outer diameter and 15.494 mm width (0.75 × 1.781 × 0.61 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 33.8 kN, C0 27.5 kN, fatigue load limit Pu 2.9 kN, reference speed 13,000 r/min, limiting speed 16,000 r/min, mass about 120 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.