L432349-310 bearing: complete specifications & equivalents
The L432349-310 is a ISO 355 radial bearing sized 158.75 x 205.583 x 23.813 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 158.75 mm |
| Outer diameter D | 205.583 mm |
| Width B | 23.813 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 168 kN |
| Basic static load rating C0 | 280 kN |
| Fatigue load limit Pu | 27 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1950 g |
| Manufacturer designation | SKF L 432349/310 |
| 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 & L432300-series range
| Bore d | 6.25 in |
|---|---|
| Outer diameter D | 8.094 in |
| Width B | 0.938 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 23.4 mm |
| Smallest bore in L432300-series | 158.75 mm |
| Largest outer diameter in L432300-series | 205.583 mm |
| Width range across L432300-series | 23.812–23.813 mm |
| Bore position in L432300-series (smallest first) | 1 of 1 |
| Bore above smallest L432300-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L432349-L432310 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 158.75×205.583×23.813 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| L432349-310 | 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 L432349-310 model number is decoded
Cross-section geometry: the 23.4 mm half-section ((205.583−158.75)/2) of this L4300-series unit places the roller large-end pitch diameter at roughly 182 mm, and the 23.813 mm axial width is split between cone (13 mm) and cup rib (11 mm) — a geometry that sets the contact angle and, with the 1950 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Why the cup reference matters here: in the L432300-series tables the L 432349 cone appears against several cup options. L432349 is the pairing with 310, and that choice — not the cone — fixes the 205.583 mm OD, the raceway track position and the 23.813 mm assembled width.SKF L432349 (SKF L 432349/310) is the L432300-series tapered roller choice for a 158.75 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 205.583×23.813 mm envelope.On the SKF nameplate, L432349 denotes a matched cone-and-cup pair: the designation is not a single number but a cone reference and cup reference joined by a slash, with the L432300-series marking the dimensional series. 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. Selection arithmetic: the C0/C ratio is about 1.67 (static 280 kN against dynamic 168 kN), typical of a tapered roller sized for axial capacity, and the 27 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting practice for L432349: the rotating cone takes the interference fit (m6 on a 158.75 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- offshore winch and drawworks drums
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
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- At 158.75 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 L432300-series inch series at 158.75 mm bore (205.583×23.813 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.
- At the 168 kN rating of L432349, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 2,800 r/min speed end and heavier preload only where moment stiffness dominates.
- 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 L432349 mounting error.
- Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.
- The 168/280 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 L432349 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 432349/310 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit L432349?
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 23.813 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 L432349 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 L432349?
The SKF L 432349/310 is a single-row tapered roller bearing with 158.75 mm bore, 205.583 mm outer diameter and 23.813 mm width (6.25 × 8.094 × 0.938 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 168 kN, C0 280 kN, fatigue load limit Pu 27 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 1950 g. It is an open, separable bearing with a pressed-steel cage.
How does the L432349 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 L432300-series code marks the dimensional series. The metric dimensions 158.75×205.583×23.813 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in L432349 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 (L432300-series) groups sizes that share the same boundary-dimension plan.
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.