LM48548A-510 bearing: complete specifications & equivalents
The LM48548A-510 is a ISO 355 radial bearing sized 34.925 x 65.088 x 18.034 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 34.925 mm |
| Outer diameter D | 65.088 mm |
| Width B | 18.034 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 58 kN |
| Basic static load rating C0 | 57 kN |
| Fatigue load limit Pu | 6.2 kN |
| Reference speed (thermal) | 8500 rpm |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 260 g |
| Manufacturer designation | SKF LM 48548 A/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 & LM48500-series range
| Bore d | 1.375 in |
|---|---|
| Outer diameter D | 2.563 in |
| Width B | 0.71 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15.1 mm |
| Smallest bore in LM48500-series | 34.925 mm |
| Largest outer diameter in LM48500-series | 65.088 mm |
| Width range across LM48500-series | 18.034–18.034 mm |
| Bore position in LM48500-series (smallest first) | 1 of 1 |
| Bore above smallest LM48500-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM48548A-LM48510 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 34.925×65.088×18.034 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| LM48548A-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 LM48548A-510 model number is decoded
SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 8,500 r/min thermal reference and 10,000 r/min mechanical limiting speed. A single LM48548A 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. Material and manufacturing detail: the 260 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the LM400 ISO envelope, with the pressed-steel cage contributing roughly 8 g of the total; the 34.925 mm bore is ground to IT5 roundness and the 65.088 mm OD to IT5 cylindricity, and the 18.034 mm width tolerance keeps the pair-setting scatter within the ISO preload class. Why the cup reference matters here: in the LM48500-series tables the LM 48548 A cone appears against several cup options. LM48548A is the pairing with 510, and that choice — not the cone — fixes the 65.088 mm OD, the raceway track position and the 18.034 mm assembled width.LM48548A is a single-row tapered roller bearing in the LM48500-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.Reading the designation: LM48548A follows the Timken-style inch convention — the cone (inner ring with rollers) and cup (outer ring) are quoted as a pair separated by a slash, and the LM48500-series code identifies the dimensional series. The 34.925 mm bore, 65.088 mm OD and 18.034 mm width are the metric equivalents of the inch boundary dimensions.
Typical equipment & failure modes
Common applications
- axle-boxes in material-handling equipment
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- 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
- roller large-end smearing against the cone rib after EP lubricant film failure
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- On this 34.925 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 LM48548A pair heats, loses setting control and smears the roller-rib contact.
- The LM48500-series inch series at 34.925 mm bore (65.088×18.034 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 LM48548A pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Setting is a design value, not an assembly feel: excessive preload in the LM48548A pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
- The 58/57 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 LM48548A (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 48548 A/510 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What do the cone and cup numbers in LM48548A 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 (LM48500-series) groups sizes that share the same boundary-dimension plan.
Can a single LM48548A 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 LM48548A 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 LM48548A position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit LM48548A?
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 18.034 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 LM48548A 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.