M244249A-210 bearing: complete specifications & equivalents
The M244249A-210 is a ISO 355 radial bearing sized 220.662 x 314.325 x 61.912 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 220.662 mm |
| Outer diameter D | 314.325 mm |
| Width B | 61.912 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 784 kN |
| Basic static load rating C0 | 1320 kN |
| Fatigue load limit Pu | 118 kN |
| Reference speed (thermal) | 1500 rpm |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15000 g |
| Manufacturer designation | SKF M 244249 A/210 |
| 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 & M244200-series range
| Bore d | 8.687 in |
|---|---|
| Outer diameter D | 12.375 in |
| Width B | 2.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 46.8 mm |
| Smallest bore in M244200-series | 220.662 mm |
| Largest outer diameter in M244200-series | 314.325 mm |
| Width range across M244200-series | 61.912–61.912 mm |
| Bore position in M244200-series (smallest first) | 1 of 1 |
| Bore above smallest M244200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| M244249A-210 | 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 M244249A-210 model number is decoded
In SKF inch-series tables M244249A sits at 220.662 mm bore (8.687 in) with a 314.325 mm cup OD and 61.912 mm total width — dimensions that trace back to the original Timken boundary plan for the M244200-series family. In SKF suffix language a bare M244249A is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 1,500 r/min reference speed the 46.8 mm-section M244249A is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 1,800 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of M244249A 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 15000 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the M2400 ISO envelope, with the pressed-steel cage contributing roughly 450 g of the total; the 220.662 mm bore is ground to IT5 roundness and the 314.325 mm OD to IT5 cylindricity, and the 61.912 mm width tolerance keeps the pair-setting scatter within the ISO preload class. The cup reference 210 is structural, not a suffix: it identifies the outer ring that, combined with the M 244249 A cone, produces the 220.662/314.325/61.912 mm envelope catalogue-listed as M244249A. Quote the cup number in full when ordering — the M244200-series tables contain other cups that fit the same cone but change the bearing.SKF M 244249 A/210 belongs to the SKF single-row tapered roller range — the 220.662 mm bore entry in the inch M244200-series, dimensioned 314.325 mm OD and 61.912 mm wide.
Typical equipment & failure modes
Common applications
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- heavy-duty rolling-mill gearboxes
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
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- At 220.662 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 M244200-series inch series at 220.662 mm bore (314.325×61.912 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 M244249A 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 784 kN rating of M244249A, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,800 r/min speed end and heavier preload only where moment stiffness dominates.
- Open M244249A 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 784/1320 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 M244249A (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF M 244249 A/210 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the M244249A 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 M244200-series code marks the dimensional series. The metric dimensions 220.662×314.325×61.912 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in M244249A 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 (M244200-series) groups sizes that share the same boundary-dimension plan.
Can a single M244249A 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 M244249A 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 M244249A position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit M244249A?
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 61.912 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.
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.