239-1320K bearing: complete specifications & equivalents
The 239-1320K 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 | 1840000 g |
| Manufacturer designation | NTN 239/1320K |
| 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 | 39 |
| 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 |
|---|---|---|---|
| 239-1320 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1320 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. 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 239-1320K model number is decoded
NTN lists 239/1320K with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 1320 mm bore, 1720 mm OD, 300 mm width, rated 120 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1320 mm (two-digit code ×5, with the 00–03 exception table), and 1720 mm OD / 300 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 120 r/min grease limiting speed is the cage/kinematic ceiling and 150 r/min is the oil-lubricated value for the 1320 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 300 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
Typical equipment & failure modes
Common applications
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- 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
- brinelling from static overload or a hammer blow during sleeve mounting
- false brinelling on stopped machines exposed to screen or crusher vibration
Selection pitfalls — read before you substitute
- At 1320 mm bore 239/1320K 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.
- Minimum load must be maintained even at rest under vibration: an unloaded 239/1320K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Never substitute 239/1320K 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 D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1320K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- 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.
- The 15100/38000 kN ratings, 1930 kN Pu and 1840000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1320K (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 239/1320K?
239/1320K 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 1840000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K denotes a 1:12 tapered bore. 239/1320K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1320.
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. 239/1320K is the basic execution.
What do D1 and W33 mean on 239/1320K?
239/1320K 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 239/1320K 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.