33116U bearing: complete specifications & equivalents
The 33116U is a ISO 355 radial bearing sized 80 x 130 x 37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 80 mm |
| Outer diameter D | 130 mm |
| Width B | 37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 199 kN |
| Basic static load rating C0 | 276 kN |
| Fatigue load limit Pu | 33 kN |
| Limiting speed (mechanical) | 2700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1870 g |
| Manufacturer designation | NTN 33116U |
| Standard | ISO 355 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); 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 & 33100-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 1.457 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in 33100-series | 40 mm |
| Largest outer diameter in 33100-series | 200 mm |
| Width range across 33100-series | 26–62 mm |
| Bore position in 33100-series (smallest first) | 9 of 13 |
| Bore above smallest 33100-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33116U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 33116U model number is decoded
The NTN 2203E table prints 33116U in the light-wide 33100 family: 80 mm bore, 130 mm cup OD, 37 mm T, with a grease limiting speed of 2,700 r/min and an oil-lubricated ceiling of 3,600 r/min. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 33116U by the metric ISO 355 number (ISO series abbreviation 3DE): 80 mm bore, 130 mm OD. The printed contact-angle geometry gives the light-wide 33100 family its characteristic load split — at 199/276 kN (C/C0) the static rating is about 1.39× C, typical of tapered bearings proportioned for heavy combined duty. The 25.0 mm section height over the 80 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. Fillet radii must clear the ring chamfers of the 130 mm cup and 80 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- Mount the 80 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1870 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The light-wide 33100 family at 80 mm bore (130×37 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 3,600 r/min oil ceiling.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 80 mm shoulder geometry, because retrofitting flips the cups.
- The 25.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33116U or the ring will bottom out on the radius instead of the shoulder face.
- Minimum load matters at high speed: an unloaded 33116U at a large fraction of 2,700 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 199/276 kN ratings and 33 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33116U (ISO 355 3DE); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 33116U?
33116U is a metric 4T tapered roller bearing to ISO 355: 80 mm bore, 130 mm outside diameter and 37 mm assembled width T (3.15 × 5.118 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 199 kN, C0 276 kN, Pu 33 kN, grease limiting speed 2,700 r/min, oil speed 3,600 r/min, mass about 1870 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33116U?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (33116U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33116U designation encode the 80 mm bore and what is 3DE?
last two digits 16 are the ISO bore code, ×5 = 80 mm (codes 00–03 use the 10/12/15/17 exception table). The 130 mm OD and 37 mm assembled T follow the ISO 355 dimension-series plan. 3DE is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 33116U list two speeds, 2,700 and 3,600 r/min?
The lower figure, 2,700 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33116U at 3,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33116U mean?
Suffix reading on 33116U: U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.