539-532X-NTN bearing: complete specifications & equivalents
The 539-532X-NTN is a ANSI ABMA 19.2 radial bearing sized 53.975 x 107.95 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 | 53.975 mm |
| Outer diameter D | 107.95 mm |
| Width B | 36.512 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 157 kN |
| Basic static load rating C0 | 177 kN |
| Limiting speed (mechanical) | 3600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1470 g |
| Manufacturer designation | NTN 4T-539/532X |
| 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 | 2.125 in |
|---|---|
| Outer diameter D | 4.25 in |
| Width B | 1.437 in |
| ISO bore code | 39 |
| Radial section height (D−d)/2 | 27 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) | 67 of 148 |
| Bore above smallest 4t-inch-series size | 41.275000000000006 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 539-532A | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| 539-532X | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 53.975×107.95×36.512 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 539-532X-NTN model number is decoded
The NTN 2203E inch table prints 4T-539/532X at 53.975 mm bore (2.125 in), 107.95 mm cup OD and 36.512 mm assembled T, with a grease limiting speed of 3,600 r/min and an oil ceiling of 4,800 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 — 539 sits in the pure-numeric inch family. Imperial cross-check for the drawing: 53.975×107.95×36.512 mm converts to 2.125 × 4.25 × 1.437 in; the ABMA envelope swaps with like-numbered inch parts but the 157/177 kN ratings are NTN-specific. Housing fitment sequence for 4T-539/532X: press the 532X cup square into the 107.95 mm seat first, then bring the 539 cone (on its 53.975 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. The rollers run with their large ends against the cone's guide rib; lubricant must reach that rib face of 4T-539/532X, not only the raceway, or the pair smears on the first overloaded start.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
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
- 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 53.975 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-539/532X.
- The pure-numeric inch family at 53.975 mm bore (107.95×36.512 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 539/532X reference at purchase.
- Replacing one half of an adjusted pair without resetting end play negates the 36.512 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Fit selection follows the rotating ring: a rotating cone on a 53.975 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Open 4T-539/532X sets have no seals: a hub or gearbox needs external sealing or the 3,600 r/min grease figure is meaningless once water reaches the cone rib.
- The 157/177 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-539/532X; 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-539/532X?
4T-539/532X is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 53.975 mm bore (2.125 in), 107.95 mm outside diameter and 36.512 mm assembled width T (4.25 × 1.437 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 157 kN, C0 177 kN, grease limiting speed 3,600 r/min, oil speed 4,800 r/min, mass about 1470 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-539/532X interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 539 cone or the 532X 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 157/177 kN ratings change with the cup.
What is the difference between 4T-539/532X and a metric ISO 355 tapered bearing?
4T-539/532X 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 53.975×107.95×36.512 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-539/532X 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 539/532X references; the 4T spelling is retained among this page's search aliases.
Why does 4T-539/532X list two speeds, 3,600 and 4,800 r/min?
The lower figure, 3,600 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-539/532X at 4,800 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.