HM624749-710 bearing: complete specifications & equivalents
The HM624749-710 is a ISO 355 radial bearing sized 120.65 x 190.5 x 46.038 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 120.65 mm |
| Outer diameter D | 190.5 mm |
| Width B | 46.038 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 388 kN |
| Basic static load rating C0 | 540 kN |
| Fatigue load limit Pu | 56 kN |
| Reference speed (thermal) | 2600 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4850 g |
| Manufacturer designation | SKF HM 624749/710 |
| 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 & HM624700-series range
| Bore d | 4.75 in |
|---|---|
| Outer diameter D | 7.5 in |
| Width B | 1.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 34.9 mm |
| Smallest bore in HM624700-series | 120.65 mm |
| Largest outer diameter in HM624700-series | 190.5 mm |
| Width range across HM624700-series | 46.038–46.038 mm |
| Bore position in HM624700-series (smallest first) | 1 of 1 |
| Bore above smallest HM624700-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM624749-710 | 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 HM624749-710 model number is decoded
Ordering number SKF HM 624749/710 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 120.65 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its inch-series envelope: HM624749 means a cone and cup matched pair in the HM624700-series series — which is why the 120.65×190.5×46.038 mm outline swaps dimensionally with other inch-series bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.39 (static 540 kN against dynamic 388 kN), typical of a tapered roller sized for axial capacity, and the 56 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating cone — and two HM624749 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Journal and housing interface: the 120.65 mm bore takes a m6 shaft seat (upper deviation ~0.241 mm for this diameter range) and the 190.5 mm outside diameter pairs with an H7 housing bore tolerance band of 190.5.000/190.520 mm; the 46.038 mm width defines the shoulder depth, and the 4850 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Cone versus cup responsibility in HM624749: the HM 624749 cone carries the 120.65 mm bore, rollers and pressed-steel cage; the 710 cup carries the 190.5 mm OD raceway, the roller-seating rib and the outer press-fit surface. The two references are not interchangeable halves.
Typical equipment & failure modes
Common applications
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- wind-turbine main shafts
- 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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 120.65 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 HM624700-series inch series at 120.65 mm bore (190.5×46.038 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.
- 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 HM624749 mounting error.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the HM624749 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Open HM624749 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 388/540 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 HM624749 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 624749/710 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of HM624749?
The SKF HM 624749/710 is a single-row tapered roller bearing with 120.65 mm bore, 190.5 mm outer diameter and 46.038 mm width (4.75 × 7.5 × 1.813 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 388 kN, C0 540 kN, fatigue load limit Pu 56 kN, reference speed 2,600 r/min, limiting speed 3,200 r/min, mass about 4850 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM624749 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 HM624700-series code marks the dimensional series. The metric dimensions 120.65×190.5×46.038 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in HM624749 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 (HM624700-series) groups sizes that share the same boundary-dimension plan.
Can a single HM624749 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 HM624749 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 HM624749 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
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.