LM451345-310 bearing: complete specifications & equivalents
The LM451345-310 is a ISO 355 radial bearing sized 263.525 x 355.6 x 57.15 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 263.525 mm |
| Outer diameter D | 355.6 mm |
| Width B | 57.15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 789 kN |
| Basic static load rating C0 | 1400 kN |
| Fatigue load limit Pu | 122 kN |
| Reference speed (thermal) | 1300 rpm |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 16000 g |
| Manufacturer designation | SKF LM 451345/310 |
| 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 & LM451300-series range
| Bore d | 10.375 in |
|---|---|
| Outer diameter D | 14 in |
| Width B | 2.25 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 46 mm |
| Smallest bore in LM451300-series | 263.525 mm |
| Largest outer diameter in LM451300-series | 355.6 mm |
| Width range across LM451300-series | 57.15–57.15 mm |
| Bore position in LM451300-series (smallest first) | 1 of 1 |
| Bore above smallest LM451300-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM451345-310 | 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 LM451345-310 model number is decoded
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. At 1,300 r/min reference speed the 46.0 mm-section LM451345 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 1,600 r/min as the mechanical ceiling. For a 263.525 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two LM451345 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Material and manufacturing detail: the 16000 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the LM400 ISO envelope, with the pressed-steel cage contributing roughly 480 g of the total; the 263.525 mm bore is ground to IT5 roundness and the 355.6 mm OD to IT5 cylindricity, and the 57.15 mm width tolerance keeps the pair-setting scatter within the ISO preload class. Cone-and-cup identity in LM451345: the leading LM 451345 reference identifies the inner ring, rollers and cage; the trailing 310 reference identifies the outer ring. The LM451300-series series lists alternative cups for the same cone, each producing a different 355.6 mm OD or 57.15 mm width — hence a different SKU even though the bore stays at 263.525 mm.For a 263.525 mm shaft carrying combined load, SKF lists LM451345 under catalogue execution SKF LM 451345/310: one open single-row tapered roller bearing in the inch LM451300-series.Reading the designation: LM451345 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 LM451300-series code identifies the dimensional series. The 263.525 mm bore, 355.6 mm OD and 57.15 mm width are the metric equivalents of the inch boundary dimensions.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- 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
- false brinelling on idle paired sets exposed to machine vibration
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- At 263.525 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 LM451300-series inch series at 263.525 mm bore (355.6×57.15 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.
- Setting is a design value, not an assembly feel: excessive preload in the LM451345 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Do not mix brands or executions inside one LM451345 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.
- Catalogue reference speed and limiting speed are different limits: the 1,300 r/min reference is a thermal criterion under load, while the 1,600 r/min limiting value is the mechanical ceiling — observe both.
- The 789/1400 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 LM451345 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 451345/310 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What do the cone and cup numbers in LM451345 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 (LM451300-series) groups sizes that share the same boundary-dimension plan.
Can a single LM451345 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 LM451345 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 LM451345 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM451345?
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 57.15 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 LM451345 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.
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.