LM739749-710 bearing: complete specifications & equivalents
The LM739749-710 is a ISO 355 radial bearing sized 196.85 x 257.175 x 39.688 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 196.85 mm |
| Outer diameter D | 257.175 mm |
| Width B | 39.688 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 339 kN |
| Basic static load rating C0 | 655 kN |
| Fatigue load limit Pu | 58.5 kN |
| Reference speed (thermal) | 1800 rpm |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5350 g |
| Manufacturer designation | SKF LM 739749/710 |
| 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 & LM739700-series range
| Bore d | 7.75 in |
|---|---|
| Outer diameter D | 10.125 in |
| Width B | 1.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30.2 mm |
| Smallest bore in LM739700-series | 196.85 mm |
| Largest outer diameter in LM739700-series | 257.175 mm |
| Width range across LM739700-series | 39.688–39.688 mm |
| Bore position in LM739700-series (smallest first) | 1 of 1 |
| Bore above smallest LM739700-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM739749-710 | 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 LM739749-710 model number is decoded
Housing and abutment design flows from the cup: in LM739749 the 710 cup fixes the 257.175 mm OD, the outer-ring face position and the rib shoulder that the rollers contact under thrust, while the LM 739749 cone determines the 196.85 mm shaft interface; the 39.688 mm width is the assembled pair value.In SKF catalogue PUB BU/P1 17000, LM739749 appears as SKF LM 739749/710: an open, single-row tapered roller bearing in the LM739700-series, supplied with a pressed-steel cage as standard.Digit by digit, LM739749 reads as cone reference / cup reference in the LM739700-series inch series; the 196.85 mm bore, 257.175 mm OD and 39.688 mm width are the metric equivalents of the original inch boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.93 (static 655 kN against dynamic 339 kN), typical of a tapered roller sized for axial capacity, and the 58.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For a 196.85 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two LM739749 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Dimensional interchange map: within the LM700 series at 196.85 mm bore, the 257.175 mm OD and 39.688 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 30.2 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 5350 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline.
Typical equipment & failure modes
Common applications
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
- rolling-mill roll-neck bearings
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
- false brinelling on idle paired sets exposed to machine vibration
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- At 196.85 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 LM739700-series inch series at 196.85 mm bore (257.175×39.688 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.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of LM739749 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of LM739749 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- Open LM739749 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 339/655 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 LM739749 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 739749/710 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is LM739749 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 LM739749?
The SKF LM 739749/710 is a single-row tapered roller bearing with 196.85 mm bore, 257.175 mm outer diameter and 39.688 mm width (7.75 × 10.125 × 1.563 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 339 kN, C0 655 kN, fatigue load limit Pu 58.5 kN, reference speed 1,800 r/min, limiting speed 2,200 r/min, mass about 5350 g. It is an open, separable bearing with a pressed-steel cage.
How does the LM739749 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 LM739700-series code marks the dimensional series. The metric dimensions 196.85×257.175×39.688 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in LM739749 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 (LM739700-series) groups sizes that share the same boundary-dimension plan.
Can a single LM739749 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.
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.