33014-NTN bearing: complete specifications & equivalents
The 33014-NTN is a ISO 355 radial bearing sized 70 x 110 x 31 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 110 mm |
| Width B | 31 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 140 kN |
| Basic static load rating C0 | 204 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1070 g |
| Manufacturer designation | NTN 33014 |
| 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 & 33000-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.22 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 33000-series | 25 mm |
| Largest outer diameter in 33000-series | 225 mm |
| Width range across 33000-series | 17–59 mm |
| Bore position in 33000-series (smallest first) | 10 of 24 |
| Bore above smallest 33000-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33014 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 70×110×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 33014-DF | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 33014-NTN model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 33014 denotes the slim 33000 family of metric tapered roller bearings, 70 mm bore, 110 mm outside diameter and 31 mm assembled width T (2.756 × 4.331 × 1.22 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the slim 33000 family and a bore code resolving to 70 mm; 110 mm OD and 31 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. At 140 kN C the bearing offers about 2.0 kN of dynamic capacity per millimetre of the 70 mm bore — compare any substitution on this ratio and the 31 mm assembled T, not on bore alone. The 2.0 kN-per-mm-bore capacity figure for 33014 summarises the 140 kN rating over 70 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 33014; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
- large agricultural and forestry machine axles
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 70 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1070 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 31 mm section of 33014 is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 70 mm bore smears the roller ends against the rib.
- ISO 355 makes the 70×110 mm envelope interchangeable but not the ratings: NTN prints 140/204 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Open 33014 units have no seals: a wheel-hub or gearbox application needs external sealing or the 3,200 r/min grease figure is meaningless once water reaches the cone rib.
- Open 33014 units have no seals: a wheel-hub or gearbox application needs external sealing or the 3,200 r/min grease figure is meaningless once water reaches the cone rib.
- The 140/204 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33014 (ISO 355 2CE); 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 33014?
33014 is a metric 4T tapered roller bearing to ISO 355: 70 mm bore, 110 mm outside diameter and 31 mm assembled width T (2.756 × 4.331 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 204 kN (2203E prints no Pu for this size), grease limiting speed 3,200 r/min, oil speed 4,200 r/min, mass about 1070 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33014?
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 (33014); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33014 designation encode the 70 mm bore and what is 2CE?
last two digits 14 are the ISO bore code, ×5 = 70 mm (codes 00–03 use the 10/12/15/17 exception table). The 110 mm OD and 31 mm assembled T follow the ISO 355 dimension-series plan. 2CE 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 33014 list two speeds, 3,200 and 4,200 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 33014 at 4,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33014 mean?
It is the basic open 4T execution — steel cage, adjusted mounting, no seal or feature suffix. NTN uses U for the uprated design, UTG for ULTAGE large-bearing specs, X for the ISO boundary section, and C/CA/D/A for contact-angle or internal-design variants; all are separate order numbers.
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.