L217849-L217810 bearing: complete specifications & equivalents
The L217849-L217810 is a ANSI ABMA 19.2 radial bearing sized 88.9 x 123.825 x 20.638 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 88.9 mm |
| Outer diameter D | 123.825 mm |
| Width B | 20.638 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 89 kN |
| Basic static load rating C0 | 141 kN |
| Limiting speed (mechanical) | 2700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 737 g |
| Manufacturer designation | NTN 4T-L217849/L217810 |
| 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 | 3.5 in |
|---|---|
| Outer diameter D | 4.875 in |
| Width B | 0.813 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 17.5 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) | 106 of 148 |
| Bore above smallest 4t-inch-series size | 76.2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L217849 | 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 L217849-L217810 model number is decoded
For an inch shaft of 88.9 mm carrying combined radial and thrust load, NTN lists 4T-L217849/L217810, a single-row 4T tapered roller set of 89 kN C and 141 kN C0 inside the 123.825 mm OD cup. 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 — L217849 sits in the light L family. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 20.638 mm T of each 4T-L217849/L217810 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-L217849/L217810: press the L217810 cup square into the 123.825 mm seat first, then bring the L217849 cone (on its 88.9 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Contact-pattern check with marking blue: a pattern biased to one roller end means the 88.9 mm pair is misadjusted and the set will edge-load in service.
Typical equipment & failure modes
Common applications
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 88.9 mm cone by induction heating (max 120 °C) and the 123.825 mm cup with a press sleeve; at 737 g a cocked ring brinells the raceway directly.
- The light L family at 88.9 mm bore (123.825×20.638 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full L217849/L217810 reference at purchase.
- Grease packs must leave free volume inside the 20.638 mm-wide set; over-greasing a pair churning near the oil-band speed of 3,500 r/min raises temperature and destroys the setting.
- ABMA makes the 88.9×123.825 mm envelope interchangeable, not the ratings: NTN prints 89/141 kN for this execution and another make of the same number can differ in roller complement.
- Grease packs must leave free volume inside the 20.638 mm-wide set; over-greasing a pair churning near the oil-band speed of 3,500 r/min raises temperature and destroys the setting.
- The 89/141 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-L217849/L217810; 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-L217849/L217810?
4T-L217849/L217810 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 88.9 mm bore (3.5 in), 123.825 mm outside diameter and 20.638 mm assembled width T (4.875 × 0.813 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 89 kN, C0 141 kN, grease limiting speed 2,700 r/min, oil speed 3,500 r/min, mass about 737 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-L217849/L217810 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the L217849 cone or the L217810 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 89/141 kN ratings change with the cup.
What is the difference between 4T-L217849/L217810 and a metric ISO 355 tapered bearing?
4T-L217849/L217810 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 88.9×123.825×20.638 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-L217849/L217810 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 L217849/L217810 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-L217849/L217810 list two speeds, 2,700 and 3,500 r/min?
The lower figure, 2,700 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-L217849/L217810 at 3,500 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.