239-800K bearing: complete specifications & equivalents
The 239-800K is a ISO 15 radial bearing sized 800 x 1060 x 195 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 800 mm |
| Outer diameter D | 1060 mm |
| Width B | 195 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 6000 kN |
| Basic static load rating C0 | 13700 kN |
| Fatigue load limit Pu | 1040 kN |
| Limiting speed (mechanical) | 240 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 471000 g |
| Manufacturer designation | NTN 239/800K |
| 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 | 31.496 in |
|---|---|
| Outer diameter D | 41.732 in |
| Width B | 7.677 in |
| ISO bore code | 39 |
| Radial section height (D−d)/2 | 130 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) | 28 of 38 |
| Bore above smallest 23900-series size | 640 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-800 | 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 239-800 — 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 239-800K model number is decoded
239/800K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 800×1060×195 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 239/800K to its envelope and execution: same-number EA versus EM or plain variants share the 800 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 239/800K: the bare number is the standard open execution; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. With about 7.5 kN of C per millimetre of the 800 mm bore, 239/800K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/800K leaves sealing and the C3/C4 clearance decision to the application drawing.
Typical equipment & failure modes
Common applications
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- pressed EA cage fatigue under sustained vibration when minimum load is not maintained
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- At 800 mm bore 239/800K 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.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 800 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.
- Never substitute 239/800K by envelope alone: the 13700 kN C0 and 1040 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 800 mm bearing, and drive-up procedures differ.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 195 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The 6000/13700 kN ratings, 1040 kN Pu and 471000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/800K (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 239/800K?
239/800K is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1060 mm OD and 195 mm width (31.496 × 41.732 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6000 kN, C0 13700 kN, Pu 1040 kN, grease limiting speed 240 r/min, oil 310 r/min, mass about 471000 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. 239/800K 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 239/800.
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. 239/800K is the basic execution.
What do D1 and W33 mean on 239/800K?
239/800K 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 239/800K 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 — 6000 kN C / 13700 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.