239-800 bearing: complete specifications & equivalents
The 239-800 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 | 487000 g |
| Manufacturer designation | NTN 239/800 |
| 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 | — |
| 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 |
|---|---|---|---|
| 239-800K | 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 239-800K (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 239-800 model number is decoded
NTN lists 239/800 with a cylindrical bore and plain outer ring (no D1/W33 groove): 800 mm bore, 1060 mm OD, 195 mm width, rated 240 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 800 mm (two-digit code ×5, with the 00–03 exception table), and 1060 mm OD / 195 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Equivalent-load planning keeps a radial plus moderate axial combination on 239/800; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 239/800 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.
Typical equipment & failure modes
Common applications
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- cage damage when a mounting force is applied through the roller set instead of the ring face
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- rolling-contact fatigue after the catalogue L10 life at the actual load
Selection pitfalls — read before you substitute
- At 800 mm bore 239/800 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.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/800 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/800 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 800 mm bearing, and drive-up procedures differ.
- Never substitute 239/800 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.
- The 6000/13700 kN ratings, 1040 kN Pu and 487000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/800 (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 239/800?
239/800 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 487000 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?
239/800 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/800K (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. 239/800 is the basic execution.
What do D1 and W33 mean on 239/800?
239/800 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 239/800 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.