33013-NTN bearing: complete specifications & equivalents
The 33013-NTN is a ISO 355 radial bearing sized 65 x 100 x 27 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 100 mm |
| Width B | 27 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 108 kN |
| Basic static load rating C0 | 156 kN |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 742 g |
| Manufacturer designation | NTN 33013 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.063 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 17.5 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) | 9 of 24 |
| Bore above smallest 33000-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33013 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 33013-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 33013-NTN model number is decoded
33013 is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 65×100 mm ISO 355 envelope, with 27 mm overall assembled width T. The last two digits 13 are the ISO bore code, ×5 = 65 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 27 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. NTN grades 4T metric bearings as open bearings without integral seals; at 65 mm bore the application supplies the seals and the grease fill or oil supply to the 2CE ISO 355 assembly. Imperial cross-check for the drawing: 65×100×27 mm is 2.559 × 3.937 × 1.063 in; ISO 355 makes the envelope interchangeable but C/C0, 108/156 kN, is NTN-specific. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for 33013; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
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
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- Mount the 65 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 742 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 27 mm section of 33013 is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 65 mm bore smears the roller ends against the rib.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 33013 by size alone can deliver the wrong contact-angle execution for a pinion position.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 65 mm shoulder geometry, because retrofitting flips the cups.
- The 17.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33013 or the ring will bottom out on the radius instead of the shoulder face.
- The 108/156 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33013 (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 33013?
33013 is a metric 4T tapered roller bearing to ISO 355: 65 mm bore, 100 mm outside diameter and 27 mm assembled width T (2.559 × 3.937 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 108 kN, C0 156 kN (2203E prints no Pu for this size), grease limiting speed 3,400 r/min, oil speed 4,600 r/min, mass about 742 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33013?
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 (33013); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33013 designation encode the 65 mm bore and what is 2CE?
last two digits 13 are the ISO bore code, ×5 = 65 mm (codes 00–03 use the 10/12/15/17 exception table). The 100 mm OD and 27 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 33013 list two speeds, 3,400 and 4,600 r/min?
The lower figure, 3,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33013 at 4,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33013 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.