365-362A bearing: complete specifications & equivalents
The 365-362A is a ANSI ABMA 19.2 radial bearing sized 50 x 88.9 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 | 50 mm |
| Outer diameter D | 88.9 mm |
| Width B | 20.638 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 85 kN |
| Basic static load rating C0 | 90.5 kN |
| Limiting speed (mechanical) | 4100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 534 g |
| Manufacturer designation | NTN 4T-365/362A |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.5 in |
| Width B | 0.813 in |
| ISO bore code | 65 |
| Radial section height (D−d)/2 | 19.5 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) | 63 of 148 |
| Bore above smallest 4t-inch-series size | 37.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 365 | 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 365-362A model number is decoded
The NTN 2203E inch table prints 4T-365/362A at 50 mm bore (1.969 in), 88.9 mm cup OD and 20.638 mm assembled T, with a grease limiting speed of 4,100 r/min and an oil ceiling of 5,500 r/min. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 365 identifies the cone of 50 mm (1.969 in) bore by catalogue lookup, and 362A fixes the 88.9 mm OD. Catalogue mass of the 4T-365/362A cone-plus-cup set is 534 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-365/362A: press the 362A cup square into the 88.9 mm seat first, then bring the 365 cone (on its 50 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 50 mm pair is misadjusted and the set will edge-load in service.
Typical equipment & failure modes
Common applications
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
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
- 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
- Hub and pinion positions of this 50 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-365/362A.
- The pure-numeric inch family at 50 mm bore (88.9×20.638 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 365/362A reference at purchase.
- Do not confuse T (20.638 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- ABMA makes the 50×88.9 mm envelope interchangeable, not the ratings: NTN prints 85/90.5 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 5,500 r/min raises temperature and destroys the setting.
- The 85/90.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-365/362A; 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-365/362A?
4T-365/362A is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 50 mm bore (1.969 in), 88.9 mm outside diameter and 20.638 mm assembled width T (3.5 × 0.813 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85 kN, C0 90.5 kN, grease limiting speed 4,100 r/min, oil speed 5,500 r/min, mass about 534 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-365/362A interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 365 cone or the 362A 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 85/90.5 kN ratings change with the cup.
What is the difference between 4T-365/362A and a metric ISO 355 tapered bearing?
4T-365/362A 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 50×88.9×20.638 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-365/362A 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 365/362A references; the 4T spelling is retained among this page's search aliases.
Why does 4T-365/362A list two speeds, 4,100 and 5,500 r/min?
The lower figure, 4,100 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-365/362A at 5,500 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.