LM102949-910 bearing: complete specifications & equivalents
The LM102949-910 is a ISO 355 radial bearing sized 45.242 x 73.431 x 19.558 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45.242 mm |
| Outer diameter D | 73.431 mm |
| Width B | 19.558 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 66 kN |
| Basic static load rating C0 | 75 kN |
| Fatigue load limit Pu | 8.15 kN |
| Reference speed (thermal) | 7000 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 310 g |
| Manufacturer designation | SKF LM 102949/910 |
| 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 & LM102900-series range
| Bore d | 1.781 in |
|---|---|
| Outer diameter D | 2.891 in |
| Width B | 0.77 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 14.1 mm |
| Smallest bore in LM102900-series | 45.242 mm |
| Largest outer diameter in LM102900-series | 73.431 mm |
| Width range across LM102900-series | 19.558–19.558 mm |
| Bore position in LM102900-series (smallest first) | 1 of 1 |
| Bore above smallest LM102900-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM102949-LM102910 | 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. |
| LM102949-910 | 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 LM102949-910 model number is decoded
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 (LM102900-series) ties the pair to a specific boundary plan. Dimensions 45.242×73.431×19.558 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. With C 66 kN and C0 75 kN, the LM102949 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 8,500 r/min. Because the contact line is tapered, one LM102949 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 45.242 mm shaft typically takes a k5 seat with an H7 housing bore. Journal and housing interface: the 45.242 mm bore takes a k5 shaft seat (upper deviation ~0.090 mm for this diameter range) and the 73.431 mm outside diameter pairs with an H7 housing bore tolerance band of 73.431.000/73.451 mm; the 19.558 mm width defines the shoulder depth, and the 310 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Cone-and-cup identity in LM102949: the leading LM 102949 reference identifies the inner ring, rollers and cage; the trailing 910 reference identifies the outer ring. The LM102900-series series lists alternative cups for the same cone, each producing a different 73.431 mm OD or 19.558 mm width — hence a different SKU even though the bore stays at 45.242 mm.For a 45.242 mm shaft carrying combined load, SKF lists LM102949 under catalogue execution SKF LM 102949/910: one open single-row tapered roller bearing in the inch LM102900-series.
Typical equipment & failure modes
Common applications
- differential and pinion drives
- pump and compressor shafts
- machine-tool spindles
- machine-tool spindles
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
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- On this 45.242 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 LM102949 pair heats, loses setting control and smears the roller-rib contact.
- The LM102900-series inch series at 45.242 mm bore (73.431×19.558 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.
- 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 LM102949 mounting error.
- Setting is a design value, not an assembly feel: excessive preload in the LM102949 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 73.431 mm cup race release as noise within the first running hours.
- The 66/75 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 LM102949 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 102949/910 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the LM102949 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 LM102900-series code marks the dimensional series. The metric dimensions 45.242×73.431×19.558 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in LM102949 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 (LM102900-series) groups sizes that share the same boundary-dimension plan.
Can a single LM102949 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 LM102949 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 LM102949 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM102949?
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 19.558 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.
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.