LM29749-711 bearing: complete specifications & equivalents
The LM29749-711 is a ISO 355 radial bearing sized 38.1 x 65.088 x 19.812 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 38.1 mm |
| Outer diameter D | 65.088 mm |
| Width B | 19.812 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 53 kN |
| Basic static load rating C0 | 57 kN |
| Fatigue load limit Pu | 6.1 kN |
| Reference speed (thermal) | 8000 rpm |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 250 g |
| Manufacturer designation | SKF LM 29749/711 |
| 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 & LM29700-series range
| Bore d | 1.5 in |
|---|---|
| Outer diameter D | 2.563 in |
| Width B | 0.78 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in LM29700-series | 38.1 mm |
| Largest outer diameter in LM29700-series | 65.088 mm |
| Width range across LM29700-series | 18.034–19.812 mm |
| Bore position in LM29700-series (smallest first) | 1 of 1 |
| Bore above smallest LM29700-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM29749-711 | 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 LM29749-711 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 (LM29700-series) ties the pair to a specific boundary plan. Dimensions 38.1×65.088×19.812 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: 8,000 r/min thermal reference and 10,000 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of LM29749 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat. Journal and housing interface: the 38.1 mm bore takes a k5 shaft seat (upper deviation ~0.076 mm for this diameter range) and the 65.088 mm outside diameter pairs with an H7 housing bore tolerance band of 65.088.000/65.108 mm; the 19.812 mm width defines the shoulder depth, and the 250 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. The cup reference 711 is structural, not a suffix: it identifies the outer ring that, combined with the LM 29749 cone, produces the 38.1/65.088/19.812 mm envelope catalogue-listed as LM29749. Quote the cup number in full when ordering — the LM29700-series tables contain other cups that fit the same cone but change the bearing.Ordering number SKF LM 29749/711 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 38.1 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.
Typical equipment & failure modes
Common applications
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- differential and pinion drives
- differential and pinion 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
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- roller large-end smearing against the cone rib after EP lubricant film failure
- 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
- On this 38.1 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 LM29749 pair heats, loses setting control and smears the roller-rib contact.
- The LM29700-series inch series at 38.1 mm bore (65.088×19.812 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 LM29749 mounting error.
- Do not mix brands or executions inside one LM29749 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.
- 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 65.088 mm cup race release as noise within the first running hours.
- The 53/57 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 LM29749 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 29749/711 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the LM29749 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 LM29700-series code marks the dimensional series. The metric dimensions 38.1×65.088×19.812 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in LM29749 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 (LM29700-series) groups sizes that share the same boundary-dimension plan.
Can a single LM29749 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 LM29749 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 LM29749 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM29749?
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 19.812 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.