M249747-710 bearing: complete specifications & equivalents
The M249747-710 is a ISO 355 radial bearing sized 257.175 x 358.775 x 71.438 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 257.175 mm |
| Outer diameter D | 358.775 mm |
| Width B | 71.438 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1030 kN |
| Basic static load rating C0 | 1760 kN |
| Fatigue load limit Pu | 156 kN |
| Reference speed (thermal) | 1300 rpm |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 21500 g |
| Manufacturer designation | SKF M 249747/710 |
| 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 & M249700-series range
| Bore d | 10.125 in |
|---|---|
| Outer diameter D | 14.125 in |
| Width B | 2.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50.8 mm |
| Smallest bore in M249700-series | 257.175 mm |
| Largest outer diameter in M249700-series | 358.775 mm |
| Width range across M249700-series | 71.438–71.438 mm |
| Bore position in M249700-series (smallest first) | 1 of 1 |
| Bore above smallest M249700-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| M249747-710 | 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 M249747-710 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. With C 1030 kN and C0 1760 kN, the M249747 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 1,600 r/min. A single M249747 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel. Cross-section geometry: the 50.8 mm half-section ((358.775−257.175)/2) of this M2400-series unit places the roller large-end pitch diameter at roughly 307 mm, and the 71.438 mm axial width is split between cone (39 mm) and cup rib (32 mm) — a geometry that sets the contact angle and, with the 21500 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Housing and abutment design flows from the cup: in M249747 the 710 cup fixes the 358.775 mm OD, the outer-ring face position and the rib shoulder that the rollers contact under thrust, while the M 249747 cone determines the 257.175 mm shaft interface; the 71.438 mm width is the assembled pair value.SKF M 249747/710 belongs to the SKF single-row tapered roller range — the 257.175 mm bore entry in the inch M249700-series, dimensioned 358.775 mm OD and 71.438 mm wide.Numbering ties the bearing to its inch-series envelope: M249747 means a cone and cup matched pair in the M249700-series series — which is why the 257.175×358.775×71.438 mm outline swaps dimensionally with other inch-series bearings of the same code.
Typical equipment & failure modes
Common applications
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
- 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
- roller large-end smearing against the cone rib after EP lubricant film failure
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- At 257.175 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 M249700-series inch series at 257.175 mm bore (358.775×71.438 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.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the M249747 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- 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 M249747 mounting error.
- The 21500 g mass and 71.438 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of M249747.
- The 1030/1760 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 M249747 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF M 249747/710 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What do the cone and cup numbers in M249747 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 (M249700-series) groups sizes that share the same boundary-dimension plan.
Can a single M249747 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 M249747 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 M249747 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit M249747?
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 71.438 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 M249747 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.