LM48548-LM48510 bearing: complete specifications & equivalents
The LM48548-LM48510 is a ANSI ABMA 19.2 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 | NTN |
| 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 |
| Basic dynamic load rating C | 51.5 kN |
| Basic static load rating C0 | 56 kN |
| Limiting speed (mechanical) | 5700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 250 g |
| Manufacturer designation | NTN 4T-LM48548/LM48510 |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 4t-inch-series range
| Bore d | 1.375 in |
|---|---|
| Outer diameter D | 2.563 in |
| Width B | 0.71 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 15.1 mm |
| Smallest bore in 4t-inch-series | 12.7 mm |
| Largest outer diameter in 4t-inch-series | 260 mm |
| Width range across 4t-inch-series | 10.998–77.788 mm |
| Bore position in 4t-inch-series (smallest first) | 34 of 148 |
| Bore above smallest 4t-inch-series size | 22.224999999999998 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM48548-510 | SKF | 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. |
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 LM48548-LM48510 model number is decoded
4T-LM48548/LM48510 is the NTN 4T catalogue entry for a 34.925×65.088×18.034 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — LM48548 sits in the light-medium LM family. Catalogue mass of the 4T-LM48548/LM48510 cone-plus-cup set is 250 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-LM48548/LM48510: press the LM48510 cup square into the 65.088 mm seat first, then bring the LM48548 cone (on its 34.925 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. A single-row tapered bearing reacts thrust in one direction only; 4T-LM48548/LM48510 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 34.925 mm class are adjusted in pairs; verify end play against the axle or gearbox drawing and re-torque after bedding-in instead of trusting the first setting on 4T-LM48548/LM48510.
- The light-medium LM family at 34.925 mm bore (65.088×18.034 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM48548/LM48510 reference at purchase.
- Never drive the 65.088 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Do not confuse T (18.034 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Inch and metric bores collide on paper — 34.925 mm is 1.375 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 51.5/56 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM48548/LM48510; internal geometry legitimately differs between inch-series makers, so re-verify ratings, adjustment and the exact cone/cup references before substituting another brand on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-LM48548/LM48510?
4T-LM48548/LM48510 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 34.925 mm bore (1.375 in), 65.088 mm outside diameter and 18.034 mm assembled width T (2.563 × 0.71 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 56 kN, grease limiting speed 5,700 r/min, oil speed 7,600 r/min, mass about 250 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM48548/LM48510 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM48548 cone or the LM48510 cup can be replaced by an identical reference from NTN or another ABMA-dimensioned maker. Pairing the cone with a different cup reference is a different catalogue row: OD, assembled T and the 51.5/56 kN ratings change with the cup.
What is the difference between 4T-LM48548/LM48510 and a metric ISO 355 tapered bearing?
4T-LM48548/LM48510 follows the ABMA inch boundary plan with cone/cup references; ISO 355 bearings use metric dimension-series numbers (302, 322, …). Even where a metric size looks close to 34.925×65.088×18.034 mm, the envelopes and contact angles differ — the two systems are not drop-in interchangeable; check every boundary value before substituting.
What does the 4T prefix on 4T-LM48548/LM48510 mean?
4T is NTN's tapered roller bearing quality mark, stamped on cone and cup in the factory. It identifies NTN's 4T programme and is not a dimension or variant code, so interchange lists quote the bare LM48548/LM48510 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM48548/LM48510 list two speeds, 5,700 and 7,600 r/min?
The lower figure, 5,700 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-LM48548/LM48510 at 7,600 r/min because oil removes rib-contact heat better. Real limits still depend on pair adjustment, oil flow and cooling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.