239-1320 bearing: complete specifications & equivalents
The 239-1320 is a ISO 15 radial bearing sized 1320 x 1720 x 300 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 1320 mm |
| Outer diameter D | 1720 mm |
| Width B | 300 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 15100 kN |
| Basic static load rating C0 | 38000 kN |
| Fatigue load limit Pu | 1930 kN |
| Limiting speed (mechanical) | 120 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1900000 g |
| Manufacturer designation | NTN 239/1320 |
| Standard | ISO 15 |
| 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 & 23900-series range
| Bore d | 51.969 in |
|---|---|
| Outer diameter D | 67.717 in |
| Width B | 11.811 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 200 mm |
| Smallest bore in 23900-series | 160 mm |
| Largest outer diameter in 23900-series | 1820 mm |
| Width range across 23900-series | 45–315 mm |
| Bore position in 23900-series (smallest first) | 37 of 38 |
| Bore above smallest 23900-series size | 1160 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-1320K | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1320K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement. |
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 239-1320 model number is decoded
239/1320 belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/1320 is assembled exactly in that order. The 200.0 mm radial section over the 1320 mm bore carries two roller rows; capacity per millimetre of bore is about 11.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 2.52 (38000/15100 kN) reflects the heavy static and shock proportioning of 239/1320; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1320 mm bore assembly by hand to distribute it across both rows.
Typical equipment & failure modes
Common applications
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
Known failure patterns
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- machined EM cage wear from inadequate oil film at the cage-guiding surfaces
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- rolling-contact fatigue after the catalogue L10 life at the actual load
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
Selection pitfalls — read before you substitute
- At 1320 mm bore 239/1320 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.
- Never substitute 239/1320 by envelope alone: the 38000 kN C0 and 1930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1320 mm bearing, and drive-up procedures differ.
- Never substitute 239/1320 by envelope alone: the 38000 kN C0 and 1930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- The cylindrical-bore 239/1320 and its tapered-bore counterpart 239/1320K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- The 15100/38000 kN ratings, 1930 kN Pu and 1900000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1320 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives.
Frequently asked questions
What are the dimensions and catalogue data of 239/1320?
239/1320 is an NTN double-row spherical roller bearing to ISO 15: 1320 mm bore, 1720 mm OD and 300 mm width (51.969 × 67.717 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15100 kN, C0 38000 kN, Pu 1930 kN, grease limiting speed 120 r/min, oil 150 r/min, mass about 1900000 g. It is open, with pressed-steel cage (standard execution).
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
239/1320 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1320K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting.
What do EA and EM mean on NTN spherical roller bearings?
EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1320 is the basic execution.
What do D1 and W33 mean on 239/1320?
239/1320 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope.
How much misalignment and axial load can 239/1320 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15100 kN C / 38000 kN C0 — but sustained pure axial load is not recommended because it unloads one row.
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.