339-332 bearing: complete specifications & equivalents
The 339-332 is a ANSI ABMA 19.2 radial bearing sized 35.717 x 80 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 | 35.717 mm |
| Outer diameter D | 80 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 75.5 kN |
| Basic static load rating C0 | 75 kN |
| Limiting speed (mechanical) | 4700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 534 g |
| Manufacturer designation | NTN 4T-339/332 |
| 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 | 1.406 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.827 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.1 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) | 38 of 148 |
| Bore above smallest 4t-inch-series size | 23.017 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 339 | 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 339-332 model number is decoded
NTN supplies this 1.406 in (35.717 mm) shaft position as 4T-339/332: cone 339, cup 332, profiled rollers and a pressed-steel cage, rated 75.5 kN basic dynamic and 75 kN static. 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 339/332 without it. Speed planning uses both catalogue columns: grease 4,700 r/min is the mechanical ceiling for 4T-339/332, oil 6,300 r/min with circulating oil — a 1,600 r/min margin at this size. Cup-side note for 332: within the pure-numeric inch family tables the 339 cone is listed against several cup options, and it is the cup that fixes the 80 mm OD and the 21 mm assembled width — quote the full 339/332 pair, never the cone alone. The rollers run with their large ends against the cone's guide rib; lubricant must reach that rib face of 4T-339/332, 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
- 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
- brinell marks on cone and cup raceways from impact during handling or hammer fitting
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 35.717 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-339/332.
- The pure-numeric inch family at 35.717 mm bore (80×21 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 339/332 reference at purchase.
- Never drive the 80 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- ABMA makes the 35.717×80 mm envelope interchangeable, not the ratings: NTN prints 75.5/75 kN for this execution and another make of the same number can differ in roller complement.
- Fit selection follows the rotating ring: a rotating cone on a 35.717 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 75.5/75 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-339/332; 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-339/332?
4T-339/332 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 35.717 mm bore (1.406 in), 80 mm outside diameter and 21 mm assembled width T (3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.5 kN, C0 75 kN, grease limiting speed 4,700 r/min, oil speed 6,300 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-339/332 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 339 cone or the 332 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 75.5/75 kN ratings change with the cup.
What is the difference between 4T-339/332 and a metric ISO 355 tapered bearing?
4T-339/332 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 35.717×80×21 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-339/332 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 339/332 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-339/332 list two speeds, 4,700 and 6,300 r/min?
The lower figure, 4,700 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-339/332 at 6,300 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.