3980-3920 bearing: complete specifications & equivalents
The 3980-3920 is a ANSI ABMA 19.2 radial bearing sized 60.325 x 112.712 x 30.162 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 60.325 mm |
| Outer diameter D | 112.712 mm |
| Width B | 30.162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 132 kN |
| Basic static load rating C0 | 174 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1340 g |
| Manufacturer designation | NTN 4T-3980/3920 |
| 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 | 2.375 in |
|---|---|
| Outer diameter D | 4.437 in |
| Width B | 1.187 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 26.2 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) | 77 of 148 |
| Bore above smallest 4t-inch-series size | 47.625 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 3980 | 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 3980-3920 model number is decoded
4T-3980/3920 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. Cone and cup of 4T-3980/3920 are separately stocked parts: a worn 3920 cup can be replaced against the existing 3980 cone, provided the new cup carries the identical reference — pairing across references changes the 30.162 mm assembled width and the rating. The 2.2 kN of dynamic capacity per millimetre of bore summarises the 132 kN rating over the 60.325 mm bore — sanity-check any interchange candidate against this ratio and the 30.162 mm T. The printed 132/174 kN ratings belong to the assembled 3980+3920 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. After bedding-in, re-check the end play of the adjusted 4T-3980/3920 pair — initial seating of the ring faces relaxes the setting slightly.
Typical equipment & failure modes
Common applications
- heavy truck and bus drive-axle differentials
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
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
- cage damage from a mounting blow transmitted through the roller complement
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Mount the 60.325 mm cone by induction heating (max 120 °C) and the 112.712 mm cup with a press sleeve; at 1340 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 60.325 mm bore (112.712×30.162 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 3980/3920 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 3980 and 3920; use undercut shoulders so the rings seat on the face, not on a radius.
- Replacing one half of an adjusted pair without resetting end play negates the 30.162 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 60.325 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 132/174 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-3980/3920; 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-3980/3920?
4T-3980/3920 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 60.325 mm bore (2.375 in), 112.712 mm outside diameter and 30.162 mm assembled width T (4.437 × 1.187 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 132 kN, C0 174 kN, grease limiting speed 3,200 r/min, oil speed 4,300 r/min, mass about 1340 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-3980/3920 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 3980 cone or the 3920 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 132/174 kN ratings change with the cup.
What is the difference between 4T-3980/3920 and a metric ISO 355 tapered bearing?
4T-3980/3920 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 60.325×112.712×30.162 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-3980/3920 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 3980/3920 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-3980/3920 list two speeds, 3,200 and 4,300 r/min?
The lower figure, 3,200 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-3980/3920 at 4,300 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.