386A-382A bearing: complete specifications & equivalents
The 386A-382A is a ANSI ABMA 19.2 radial bearing sized 47.625 x 96.838 x 21 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 47.625 mm |
| Outer diameter D | 96.838 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 86.5 kN |
| Basic static load rating C0 | 96.5 kN |
| Limiting speed (mechanical) | 3700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 719 g |
| Manufacturer designation | NTN 4T-386A/382A |
| 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 | 1.875 in |
|---|---|
| Outer diameter D | 3.813 in |
| Width B | 0.827 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 24.6 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) | 59 of 148 |
| Bore above smallest 4t-inch-series size | 34.925 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 386A | 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 386A-382A model number is decoded
4T-386A/382A is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 47.625×96.838×21 mm (assembled width T), for a shaft of about 47.625 mm (1.875 in). The 4T prefix is NTN's tapered roller quality mark stamped on both parts; it is a brand mark, not a size code, so cross-references quote 386A/382A without it. Selection: C 86.5 kN against C0 96.5 kN gives a C0/C ratio of 1.12 for the 47.625 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. Cup-side note for 382A: within the pure-numeric inch family tables the 386A cone is listed against several cup options, and it is the cup that fixes the 96.838 mm OD and the 21 mm assembled width — quote the full 386A/382A pair, never the cone alone. After bedding-in, re-check the end play of the adjusted 4T-386A/382A pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 47.625 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-386A/382A.
- The pure-numeric inch family at 47.625 mm bore (96.838×21 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 386A/382A reference at purchase.
- Quote the full 386A/382A pair at ordering: the 386A cone also ships against sibling cups, and a cup from another reference changes the 21 mm assembled width and the rating.
- Fit selection follows the rotating ring: a rotating cone on a 47.625 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Quote the full 386A/382A pair at ordering: the 386A cone also ships against sibling cups, and a cup from another reference changes the 21 mm assembled width and the rating.
- The 86.5/96.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-386A/382A; 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-386A/382A?
4T-386A/382A is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 47.625 mm bore (1.875 in), 96.838 mm outside diameter and 21 mm assembled width T (3.813 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 86.5 kN, C0 96.5 kN, grease limiting speed 3,700 r/min, oil speed 5,000 r/min, mass about 719 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-386A/382A interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 386A cone or the 382A 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 86.5/96.5 kN ratings change with the cup.
What is the difference between 4T-386A/382A and a metric ISO 355 tapered bearing?
4T-386A/382A 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 47.625×96.838×21 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-386A/382A 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 386A/382A references; the 4T spelling is retained among this page's search aliases.
Why does 4T-386A/382A list two speeds, 3,700 and 5,000 r/min?
The lower figure, 3,700 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-386A/382A at 5,000 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.