L44649-610 bearing: complete specifications & equivalents
The L44649-610 is a ISO 355 radial bearing sized 26.988 x 50.292 x 14.224 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 26.988 mm |
| Outer diameter D | 50.292 mm |
| Width B | 14.224 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 32 kN |
| Basic static load rating C0 | 30 kN |
| Fatigue load limit Pu | 3 kN |
| Reference speed (thermal) | 11000 rpm |
| Limiting speed (mechanical) | 13000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120 g |
| Manufacturer designation | SKF L 44649/610 |
| 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 & L44600-series range
| Bore d | 1.063 in |
|---|---|
| Outer diameter D | 1.98 in |
| Width B | 0.56 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 11.7 mm |
| Smallest bore in L44600-series | 25.4 mm |
| Largest outer diameter in L44600-series | 50.292 mm |
| Width range across L44600-series | 14.224–14.224 mm |
| Bore position in L44600-series (smallest first) | 2 of 2 |
| Bore above smallest L44600-series size | 1.588000000000001 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L44649-L44610 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 26.988×50.292×14.224 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| L44649-610 | 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 L44649-610 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 11,000 r/min reference speed the 11.7 mm-section L44649 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 13,000 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of L44649 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting. Material and manufacturing detail: the 120 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the L4400 ISO envelope, with the pressed-steel cage contributing roughly 4 g of the total; the 26.988 mm bore is ground to IT5 roundness and the 50.292 mm OD to IT5 cylindricity, and the 14.224 mm width tolerance keeps the pair-setting scatter within the ISO preload class. Why the cup reference matters here: in the L44600-series tables the L 44649 cone appears against several cup options. L44649 is the pairing with 610, and that choice — not the cone — fixes the 50.292 mm OD, the raceway track position and the 14.224 mm assembled width.SKF L 44649/610 belongs to the SKF single-row tapered roller range — the 26.988 mm bore entry in the inch L44600-series, dimensioned 50.292 mm OD and 14.224 mm wide.Digit by digit, L44649 reads as cone reference / cup reference in the L44600-series inch series; the 26.988 mm bore, 50.292 mm OD and 14.224 mm width are the metric equivalents of the original inch boundary values.
Typical equipment & failure modes
Common applications
- machine-tool spindles
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
- industrial gearbox shafts and reducers
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
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- On this 26.988 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 L44649 pair heats, loses setting control and smears the roller-rib contact.
- The L44600-series inch series at 26.988 mm bore (50.292×14.224 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.
- A single L44649 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
- At the 32 kN rating of L44649, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 13,000 r/min speed end and heavier preload only where moment stiffness dominates.
- Catalogue reference speed and limiting speed are different limits: the 11,000 r/min reference is a thermal criterion under load, while the 13,000 r/min limiting value is the mechanical ceiling — observe both.
- The 32/30 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 L44649 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF L 44649/610 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What do the cone and cup numbers in L44649 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 (L44600-series) groups sizes that share the same boundary-dimension plan.
Can a single L44649 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 L44649 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 L44649 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit L44649?
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 14.224 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 L44649 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.