HM88542-510 bearing: complete specifications & equivalents
The HM88542-510 is a ISO 355 radial bearing sized 31.75 x 73.025 x 29.37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 31.75 mm |
| Outer diameter D | 73.025 mm |
| Width B | 29.37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 86.5 kN |
| Basic static load rating C0 | 95 kN |
| Fatigue load limit Pu | 10.4 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 620 g |
| Manufacturer designation | SKF HM 88542/510 |
| 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 & HM88500-series range
| Bore d | 1.25 in |
|---|---|
| Outer diameter D | 2.875 in |
| Width B | 1.156 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20.6 mm |
| Smallest bore in HM88500-series | 31.75 mm |
| Largest outer diameter in HM88500-series | 73.025 mm |
| Width range across HM88500-series | 29.37–29.37 mm |
| Bore position in HM88500-series (smallest first) | 1 of 1 |
| Bore above smallest HM88500-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HM88542-HM88510 | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| HM88542-HM88512 | NTN | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| HM88542-510 | 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 HM88542-510 model number is decoded
Cross-section geometry: the 20.6 mm half-section ((73.025−31.75)/2) of this HM800-series unit places the roller large-end pitch diameter at roughly 52 mm, and the 29.37 mm axial width is split between cone (16 mm) and cup rib (13 mm) — a geometry that sets the contact angle and, with the 620 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Why the cup reference matters here: in the HM88500-series tables the HM 88542 cone appears against several cup options. HM88542 is the pairing with 510, and that choice — not the cone — fixes the 73.025 mm OD, the raceway track position and the 29.37 mm assembled width.The SKF HM 88542/510 is a 31.75×73.025×29.37 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.The code breaks down as cone/cup: the numbers before and after the slash identify the inner and outer ring sets, and the series prefix (HM88500-series) ties the pair to a specific boundary plan. Dimensions 31.75×73.025×29.37 mm are the converted metric envelope. 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 10.4 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.10 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. For a 31.75 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two HM88542 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.
Typical equipment & failure modes
Common applications
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- differential and pinion drives
- pump and compressor shafts
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
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- On this 31.75 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 HM88542 pair heats, loses setting control and smears the roller-rib contact.
- The HM88500-series inch series at 31.75 mm bore (73.025×29.37 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.
- Setting is a design value, not an assembly feel: excessive preload in the HM88542 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the HM88542 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Open HM88542 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 86.5/95 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 HM88542 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 88542/510 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What shaft and housing fits suit HM88542?
For a rotating shaft under normal load, seat the cone on a k5 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 29.37 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 HM88542 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 HM88542?
The SKF HM 88542/510 is a single-row tapered roller bearing with 31.75 mm bore, 73.025 mm outer diameter and 29.37 mm width (1.25 × 2.875 × 1.156 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 86.5 kN, C0 95 kN, fatigue load limit Pu 10.4 kN, reference speed 7,500 r/min, limiting speed 9,000 r/min, mass about 620 g. It is an open, separable bearing with a pressed-steel cage.
How does the HM88542 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 HM88500-series code marks the dimensional series. The metric dimensions 31.75×73.025×29.37 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in HM88542 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 (HM88500-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.