42690-42620-NTN bearing: complete specifications & equivalents
The 42690-42620-NTN is a ANSI ABMA 19.2 radial bearing sized 77.788 x 127 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 | 77.788 mm |
| Outer diameter D | 127 mm |
| Width B | 30.162 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 150 kN |
| Basic static load rating C0 | 194 kN |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1240 g |
| Manufacturer designation | NTN 4T-42690/42620 |
| 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 | 3.063 in |
|---|---|
| Outer diameter D | 5 in |
| Width B | 1.187 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) | 95 of 148 |
| Bore above smallest 4t-inch-series size | 65.088 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 42690-42620 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 77.788×127×30.162 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 42690-42620-NTN model number is decoded
NTN supplies this 3.063 in (77.788 mm) shaft position as 4T-42690/42620: cone 42690, cup 42620, profiled rollers and a pressed-steel cage, rated 150 kN basic dynamic and 194 kN static. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — 42690 sits in the pure-numeric inch family. The 1.9 kN of dynamic capacity per millimetre of bore summarises the 150 kN rating over the 77.788 mm bore — sanity-check any interchange candidate against this ratio and the 30.162 mm T. The printed 150/194 kN ratings belong to the assembled 42690+42620 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. Running clearance of 4T-42690/42620 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- 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 77.788 mm cone by induction heating (max 120 °C) and the 127 mm cup with a press sleeve; at 1240 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 77.788 mm bore (127×30.162 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 42690/42620 reference at purchase.
- Never drive the 127 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.
- An unloaded 4T-42690/42620 near 2,800 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- 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.
- The 150/194 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-42690/42620; 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-42690/42620?
4T-42690/42620 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 77.788 mm bore (3.063 in), 127 mm outside diameter and 30.162 mm assembled width T (5 × 1.187 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 194 kN, grease limiting speed 2,800 r/min, oil speed 3,700 r/min, mass about 1240 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-42690/42620 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 42690 cone or the 42620 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 150/194 kN ratings change with the cup.
What is the difference between 4T-42690/42620 and a metric ISO 355 tapered bearing?
4T-42690/42620 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 77.788×127×30.162 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-42690/42620 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 42690/42620 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-42690/42620 list two speeds, 2,800 and 3,700 r/min?
The lower figure, 2,800 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-42690/42620 at 3,700 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.