32936XU bearing: complete specifications & equivalents
The 32936XU is a ISO 355 radial bearing sized 180 x 250 x 45 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 180 mm |
| Outer diameter D | 250 mm |
| Width B | 45 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 390 kN |
| Basic static load rating C0 | 700 kN |
| Fatigue load limit Pu | 68 kN |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6550 g |
| Manufacturer designation | NTN 32936XU |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.772 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 35 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) | 23 of 37 |
| Bore above smallest 32900-series size | 145 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32936XU | 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 32936XU model number is decoded
The NTN 2203E table prints 32936XU in the extra-light thin-section 32900 family: 180 mm bore, 250 mm cup OD, 45 mm T, with a grease limiting speed of 1,300 r/min and an oil-lubricated ceiling of 1,700 r/min. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 32936XU resolves to 180 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. At 390 kN C the bearing offers about 2.2 kN of dynamic capacity per millimetre of the 180 mm bore — compare any substitution on this ratio and the 45 mm assembled T, not on bore alone. The two speed columns differ by a factor of .76 (grease/limiting 1,300 vs oil 1,700 r/min); heat generation at the cone rib decides which lubrication a real 32936XU arrangement can sustain. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32936XU arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 180 mm bore the 32936XU set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 390 kN C level.
- The thin 45 mm section of 32936XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 180 mm bore smears the roller ends against the rib.
- Grease packs must leave free volume in the 45 mm-wide set; over-greasing a paired bearing churning at the 1,700 r/min oil-band speed raises temperature and destroys the preload setting.
- Never fit the 180 mm cone by hammering the 250 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Open 32936XU units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,300 r/min grease figure is meaningless once water reaches the cone rib.
- The 390/700 kN ratings and 68 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32936XU (ISO 355 4DC); 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 32936XU?
32936XU is a metric 4T tapered roller bearing to ISO 355: 180 mm bore, 250 mm outside diameter and 45 mm assembled width T (7.087 × 9.843 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 700 kN, Pu 68 kN, grease limiting speed 1,300 r/min, oil speed 1,700 r/min, mass about 6550 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32936XU?
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 (32936XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32936XU designation encode the 180 mm bore and what is 4DC?
last two digits 36 are the ISO bore code, ×5 = 180 mm (codes 00–03 use the 10/12/15/17 exception table). The 250 mm OD and 45 mm assembled T follow the ISO 355 dimension-series plan. 4DC 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 32936XU list two speeds, 1,300 and 1,700 r/min?
The lower figure, 1,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32936XU at 1,700 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32936XU mean?
Suffix reading on 32936XU: 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.