HM807040-010 bearing: complete specifications & equivalents
The HM807040-010 is a ISO 355 radial bearing sized 44.45 x 104.775 x 36.512 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 44.45 mm |
| Outer diameter D | 104.775 mm |
| Width B | 36.512 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 180 kN |
| Basic static load rating C0 | 204 kN |
| Fatigue load limit Pu | 22.4 kN |
| Reference speed (thermal) | 5000 rpm |
| Limiting speed (mechanical) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1650 g |
| Manufacturer designation | SKF HM 807040/010 |
| 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 & HM-807000-series range
| Bore d | 1.75 in |
|---|---|
| Outer diameter D | 4.125 in |
| Width B | 1.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30.2 mm |
| Smallest bore in HM-807000-series | 44.45 mm |
| Largest outer diameter in HM-807000-series | 104.775 mm |
| Width range across HM-807000-series | 36.512–36.512 mm |
| Bore position in HM-807000-series (smallest first) | 1 of 1 |
| Bore above smallest HM-807000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM807040-HM807010 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 44.45×104.775×36.512 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| HM807040-010 | 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 HM807040-010 model number is decoded
The cup reference 010 is structural, not a suffix: it identifies the outer ring that, combined with the HM 807040 cone, produces the 44.45/104.775/36.512 mm envelope catalogue-listed as HM807040. Quote the cup number in full when ordering — the HM-807000-series tables contain other cups that fit the same cone but change the bearing.HM807040 is a single-row tapered roller bearing in the HM-807000-series inch series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Digit by digit, HM807040 reads as cone reference / cup reference in the HM-807000-series inch series; the 44.45 mm bore, 104.775 mm OD and 36.512 mm width are the metric equivalents of the original inch boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 22.4 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.13 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. A single HM807040 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. Speed envelope and thermal behaviour: at 5,000 r/min thermal reference, the 44.45 mm bore shaft runs at a dn of 222k, and the 30.2 mm section dissipates heat through the cup-to-housing contact path; the 6,300 r/min mechanical ceiling reflects cage strength, and the 1650 g spinning cone contributes gyroscopic moment under rapid speed reversal.
Typical equipment & failure modes
Common applications
- axle-boxes in material-handling equipment
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- machine-tool spindles
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
- roller large-end smearing against the cone rib after EP lubricant film failure
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- 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 44.45 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 HM807040 pair heats, loses setting control and smears the roller-rib contact.
- The HM-807000-series inch series at 44.45 mm bore (104.775×36.512 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.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of HM807040 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- Setting is a design value, not an assembly feel: excessive preload in the HM807040 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- The 1650 g mass and 36.512 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 HM807040.
- The 180/204 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 HM807040 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 807040/010 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is HM807040 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 HM807040?
The SKF HM 807040/010 is a single-row tapered roller bearing with 44.45 mm bore, 104.775 mm outer diameter and 36.512 mm width (1.75 × 4.125 × 1.437 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 180 kN, C0 204 kN, fatigue load limit Pu 22.4 kN, reference speed 5,000 r/min, limiting speed 6,300 r/min, mass about 1650 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM807040 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 HM-807000-series code marks the dimensional series. The metric dimensions 44.45×104.775×36.512 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in HM807040 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 (HM-807000-series) groups sizes that share the same boundary-dimension plan.
Can a single HM807040 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.
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.