32916XU bearing: complete specifications & equivalents
The 32916XU is a ISO 355 radial bearing sized 80 x 110 x 20 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 | 110 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 79.5 kN |
| Basic static load rating C0 | 121 kN |
| Fatigue load limit Pu | 14.8 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 540 g |
| Manufacturer designation | NTN 32916XU |
| 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 & 32900-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 mm |
| Smallest bore in 32900-series | 35 mm |
| Largest outer diameter in 32900-series | 600 mm |
| Width range across 32900-series | 14–100 mm |
| Bore position in 32900-series (smallest first) | 10 of 37 |
| Bore above smallest 32900-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32916XU | 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 32916XU model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32916XU denotes the extra-light thin-section 32900 family of metric tapered roller bearings, 80 mm bore, 110 mm outside diameter and 20 mm assembled width T (3.15 × 4.331 × 0.787 in) to the ISO 355 boundary plan. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32916XU by the metric ISO 355 number (ISO series abbreviation 2BC): 80 mm bore, 110 mm OD. The printed contact-angle geometry gives the extra-light thin-section 32900 family its characteristic load split — at 79.5/121 kN (C/C0) the static rating is about 1.52× C, typical of tapered bearings proportioned for heavy combined duty. The 1.0 kN-per-mm-bore capacity figure for 32916XU summarises the 79.5 kN rating over 80 mm bore; use it to sanity-check an interchange candidate before swapping brands. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for 32916XU; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- 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 540 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 20 mm section of 32916XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 80 mm bore smears the roller ends against the rib.
- Never fit the 80 mm cone by hammering the 110 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Do not confuse T (20 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- Minimum load matters at high speed: an unloaded 32916XU at a large fraction of 3,000 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 79.5/121 kN ratings and 14.8 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32916XU (ISO 355 2BC); 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 32916XU?
32916XU is a metric 4T tapered roller bearing to ISO 355: 80 mm bore, 110 mm outside diameter and 20 mm assembled width T (3.15 × 4.331 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 79.5 kN, C0 121 kN, Pu 14.8 kN, grease limiting speed 3,000 r/min, oil speed 4,000 r/min, mass about 540 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32916XU?
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 (32916XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32916XU designation encode the 80 mm bore and what is 2BC?
last two digits 16 are the ISO bore code, ×5 = 80 mm (codes 00–03 use the 10/12/15/17 exception table). The 110 mm OD and 20 mm assembled T follow the ISO 355 dimension-series plan. 2BC 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 32916XU list two speeds, 3,000 and 4,000 r/min?
The lower figure, 3,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32916XU at 4,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32916XU mean?
Suffix reading on 32916XU: XU combines the X ISO boundary section with the U uprated internal design; 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.