HM261049-010 bearing: complete specifications & equivalents
The HM261049-010 is a ISO 355 radial bearing sized 333.375 x 469.9 x 90.488 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 333.375 mm |
| Outer diameter D | 469.9 mm |
| Width B | 90.488 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1428 kN |
| Basic static load rating C0 | 2850 kN |
| Fatigue load limit Pu | 232 kN |
| Reference speed (thermal) | 850 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 47000 g |
| Manufacturer designation | SKF HM 261049/010 |
| 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 & HM261000-series range
| Bore d | 13.125 in |
|---|---|
| Outer diameter D | 18.5 in |
| Width B | 3.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 68.3 mm |
| Smallest bore in HM261000-series | 333.375 mm |
| Largest outer diameter in HM261000-series | 469.9 mm |
| Width range across HM261000-series | 90.488–90.488 mm |
| Bore position in HM261000-series (smallest first) | 1 of 1 |
| Bore above smallest HM261000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM261049-010 | 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 HM261049-010 model number is decoded
Cross-section geometry: the 68.3 mm half-section ((469.9−333.375)/2) of this HM200-series unit places the roller large-end pitch diameter at roughly 401 mm, and the 90.488 mm axial width is split between cone (50 mm) and cup rib (41 mm) — a geometry that sets the contact angle and, with the 47000 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Housing and abutment design flows from the cup: in HM261049 the 010 cup fixes the 469.9 mm OD, the outer-ring face position and the rib shoulder that the rollers contact under thrust, while the HM 261049 cone determines the 333.375 mm shaft interface; the 90.488 mm width is the assembled pair value.SKF HM261049 (SKF HM 261049/010) is the HM261000-series tapered roller choice for a 333.375 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 469.9×90.488 mm envelope.On the SKF nameplate, HM261049 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 HM261000-series marking the dimensional series. In SKF suffix language a bare HM261049 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 850 r/min thermal reference and 1,200 r/min mechanical limiting speed. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of HM261049 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.
Typical equipment & failure modes
Common applications
- marine propulsion gearboxes
- large industrial mixer shafts
- offshore winch and drawworks drums
- 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
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- roller large-end smearing against the cone rib after EP lubricant film failure
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- At 333.375 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 HM261000-series inch series at 333.375 mm bore (469.9×90.488 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 1428 kN rating of HM261049, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,200 r/min speed end and heavier preload only where moment stiffness dominates.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of HM261049 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- 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 469.9 mm cup race release as noise within the first running hours.
- The 1428/2850 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 HM261049 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 261049/010 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit HM261049?
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 90.488 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 HM261049 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 HM261049?
The SKF HM 261049/010 is a single-row tapered roller bearing with 333.375 mm bore, 469.9 mm outer diameter and 90.488 mm width (13.125 × 18.5 × 3.563 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1428 kN, C0 2850 kN, fatigue load limit Pu 232 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 47000 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM261049 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 HM261000-series code marks the dimensional series. The metric dimensions 333.375×469.9×90.488 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in HM261049 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 (HM261000-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.