593-592A-NTN bearing: complete specifications & equivalents
The 593-592A-NTN is a ANSI ABMA 19.2 radial bearing sized 88.9 x 152.4 x 39.688 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 | 152.4 mm |
| Width B | 39.688 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 199 kN |
| Basic static load rating C0 | 279 kN |
| Limiting speed (mechanical) | 2300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2770 g |
| Manufacturer designation | NTN 4T-593/592A |
| 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 | 6 in |
| Width B | 1.563 in |
| ISO bore code | 93 |
| Radial section height (D−d)/2 | 31.8 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 |
|---|---|---|---|
| 593-592A | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 88.9×152.4×39.688 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 593-592A-NTN model number is decoded
4T-593/592A belongs to the NTN inch 4T tapered roller range (pure-numeric inch family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 593 identifies the cone of 88.9 mm (3.5 in) bore by catalogue lookup, and 592A fixes the 152.4 mm OD. Imperial cross-check for the drawing: 88.9×152.4×39.688 mm converts to 3.5 × 6 × 1.563 in; the ABMA envelope swaps with like-numbered inch parts but the 199/279 kN ratings are NTN-specific. Housing fitment sequence for 4T-593/592A: press the 592A cup square into the 152.4 mm seat first, then bring the 593 cone (on its 88.9 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. After bedding-in, re-check the end play of the adjusted 4T-593/592A pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- 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 152.4 mm cup with a press sleeve; at 2770 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 88.9 mm bore (152.4×39.688 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 593/592A reference at purchase.
- ABMA makes the 88.9×152.4 mm envelope interchangeable, not the ratings: NTN prints 199/279 kN for this execution and another make of the same number can differ in roller complement.
- Open 4T-593/592A sets have no seals: a hub or gearbox needs external sealing or the 2,300 r/min grease figure is meaningless once water reaches the cone rib.
- Inch and metric bores collide on paper — 88.9 mm is 3.5 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- The 199/279 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-593/592A; 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-593/592A?
4T-593/592A is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 88.9 mm bore (3.5 in), 152.4 mm outside diameter and 39.688 mm assembled width T (6 × 1.563 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 199 kN, C0 279 kN, grease limiting speed 2,300 r/min, oil speed 3,100 r/min, mass about 2770 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-593/592A interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 593 cone or the 592A 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 199/279 kN ratings change with the cup.
What is the difference between 4T-593/592A and a metric ISO 355 tapered bearing?
4T-593/592A 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 88.9×152.4×39.688 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-593/592A 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 593/592A references; the 4T spelling is retained among this page's search aliases.
Why does 4T-593/592A list two speeds, 2,300 and 3,100 r/min?
The lower figure, 2,300 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-593/592A at 3,100 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.