30213-NTN bearing: complete specifications & equivalents
The 30213-NTN is a ISO 355 radial bearing sized 65 x 120 x 24.75 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 | 120 mm |
| Width B | 24.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 136 kN |
| Basic static load rating C0 | 148 kN |
| Limiting speed (mechanical) | 3100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1180 g |
| Manufacturer designation | NTN 30213 |
| 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 & 30200-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 0.974 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 13 of 37 |
| Bore above smallest 30200-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30213 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 65×120×24.75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 30213-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 30213-NTN model number is decoded
30213 is the NTN 4T catalogue entry for a 65×120×24.75 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 30213 resolves to 65 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 136 kN C the bearing offers about 2.1 kN of dynamic capacity per millimetre of the 65 mm bore — compare any substitution on this ratio and the 24.75 mm assembled T, not on bore alone. Grease relubrication at 3,100 r/min limiting speed targets the rib contact; if the drive needs 4,200 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for 30213; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- water-induced pitting when the open bearing is exposed to washdown without external seals
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 1180 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The standard-section 30200 family at 65 mm bore (120×24.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 4,200 r/min oil ceiling.
- Grease packs must leave free volume in the 24.75 mm-wide set; over-greasing a paired bearing churning at the 4,200 r/min oil-band speed raises temperature and destroys the preload setting.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 30213 by size alone can deliver the wrong contact-angle execution for a pinion position.
- Open 30213 units have no seals: a wheel-hub or gearbox application needs external sealing or the 3,100 r/min grease figure is meaningless once water reaches the cone rib.
- The 136/148 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30213 (ISO 355 3EB); 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 30213?
30213 is a metric 4T tapered roller bearing to ISO 355: 65 mm bore, 120 mm outside diameter and 24.75 mm assembled width T (2.559 × 4.724 × 0.974 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 136 kN, C0 148 kN (2203E prints no Pu for this size), grease limiting speed 3,100 r/min, oil speed 4,200 r/min, mass about 1180 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30213?
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 (30213); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30213 designation encode the 65 mm bore and what is 3EB?
last two digits 13 are the ISO bore code, ×5 = 65 mm (codes 00–03 use the 10/12/15/17 exception table). The 120 mm OD and 24.75 mm assembled T follow the ISO 355 dimension-series plan. 3EB 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 30213 list two speeds, 3,100 and 4,200 r/min?
The lower figure, 3,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 30213 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 30213 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.