52387-52618 bearing: complete specifications & equivalents
The 52387-52618 is a ANSI ABMA 19.2 radial bearing sized 96.838 x 157.162 x 36.512 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 96.838 mm |
| Outer diameter D | 157.162 mm |
| Width B | 36.512 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 208 kN |
| Basic static load rating C0 | 305 kN |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2620 g |
| Manufacturer designation | NTN 4T-52387/52618 |
| 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 | 3.813 in |
|---|---|
| Outer diameter D | 6.187 in |
| Width B | 1.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30.2 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) | 114 of 148 |
| Bore above smallest 4t-inch-series size | 84.13799999999999 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 52387 | 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 52387-52618 model number is decoded
The NTN 2203E inch table prints 4T-52387/52618 at 96.838 mm bore (3.813 in), 157.162 mm cup OD and 36.512 mm assembled T, with a grease limiting speed of 2,200 r/min and an oil ceiling of 2,900 r/min. 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 — 52387 sits in the pure-numeric inch family. The 2.1 kN of dynamic capacity per millimetre of bore summarises the 208 kN rating over the 96.838 mm bore — sanity-check any interchange candidate against this ratio and the 36.512 mm T. Housing fitment sequence for 4T-52387/52618: press the 52618 cup square into the 157.162 mm seat first, then bring the 52387 cone (on its 96.838 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Back-to-back (O) and face-to-face (X) arrangements of two 4T-52387/52618 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
Typical equipment & failure modes
Common applications
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
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
- 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 96.838 mm cone by induction heating (max 120 °C) and the 157.162 mm cup with a press sleeve; at 2620 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 96.838 mm bore (157.162×36.512 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 52387/52618 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 52387 and 52618; use undercut shoulders so the rings seat on the face, not on a radius.
- Grease packs must leave free volume inside the 36.512 mm-wide set; over-greasing a pair churning near the oil-band speed of 2,900 r/min raises temperature and destroys the setting.
- Inch and metric bores collide on paper — 96.838 mm is 3.813 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 208/305 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-52387/52618; 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-52387/52618?
4T-52387/52618 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 96.838 mm bore (3.813 in), 157.162 mm outside diameter and 36.512 mm assembled width T (6.187 × 1.437 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 305 kN, grease limiting speed 2,200 r/min, oil speed 2,900 r/min, mass about 2620 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-52387/52618 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 52387 cone or the 52618 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 208/305 kN ratings change with the cup.
What is the difference between 4T-52387/52618 and a metric ISO 355 tapered bearing?
4T-52387/52618 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 96.838×157.162×36.512 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-52387/52618 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 52387/52618 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-52387/52618 list two speeds, 2,200 and 2,900 r/min?
The lower figure, 2,200 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-52387/52618 at 2,900 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.