LM72849-LM72810 bearing: complete specifications & equivalents
The LM72849-LM72810 is a ANSI ABMA 19.2 radial bearing sized 22.606 x 47 x 15.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 22.606 mm |
| Outer diameter D | 47 mm |
| Width B | 15.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 30.5 kN |
| Basic static load rating C0 | 32.5 kN |
| Limiting speed (mechanical) | 8200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 125 g |
| Manufacturer designation | NTN 4T-LM72849/LM72810 |
| 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 | 0.89 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.61 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 12.2 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) | 14 of 148 |
| Bore above smallest 4t-inch-series size | 9.906000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM72849 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 LM72849-LM72810 model number is decoded
4T-LM72849/LM72810 is the NTN 4T catalogue entry for a 22.606×47×15.5 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Reading the designation: 4T-LM72849/LM72810 follows the ABMA inch convention — the number before the slash is the cone (inner ring with roller set and cage), the number after the slash is the cup (outer ring), and the light-medium LM family lettering ties the pair to its boundary plan. The 12.2 mm radial section over the 22.606 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. The printed 30.5/32.5 kN ratings belong to the assembled LM72849+LM72810 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. Minimum load matters at speed: an unloaded 4T-LM72849/LM72810 run near 8,200 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.
Typical equipment & failure modes
Common applications
- lawn, garden and powersport axle positions
- small inch-shaft gearbox and reducer shafts
- conveyor roller and pulley shafts in inch-frame machinery
- utility-vehicle differential and pinion supports
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- false brinelling on a stationary pair exposed to vibration during transport or standby
- cage damage from a mounting blow transmitted through the roller complement
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- At 22.606 mm (0.89 in) bore the thin cone and cup distort under an over-tight shaft nut; set the 4T-LM72849/LM72810 pair with a dial indicator on end play rather than by locknut feel.
- The light-medium LM family at 22.606 mm bore (47×15.5 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM72849/LM72810 reference at purchase.
- Grease packs must leave free volume inside the 15.5 mm-wide set; over-greasing a pair churning near the oil-band speed of 11,000 r/min raises temperature and destroys the setting.
- Do not confuse T (15.5 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Replacing one half of an adjusted pair without resetting end play negates the 15.5 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 30.5/32.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM72849/LM72810; 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-LM72849/LM72810?
4T-LM72849/LM72810 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 22.606 mm bore (0.89 in), 47 mm outside diameter and 15.5 mm assembled width T (1.85 × 0.61 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 32.5 kN, grease limiting speed 8,200 r/min, oil speed 11,000 r/min, mass about 125 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM72849/LM72810 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM72849 cone or the LM72810 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 30.5/32.5 kN ratings change with the cup.
What is the difference between 4T-LM72849/LM72810 and a metric ISO 355 tapered bearing?
4T-LM72849/LM72810 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 22.606×47×15.5 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-LM72849/LM72810 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 LM72849/LM72810 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM72849/LM72810 list two speeds, 8,200 and 11,000 r/min?
The lower figure, 8,200 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-LM72849/LM72810 at 11,000 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.