239-630 bearing: complete specifications & equivalents
The 239-630 is a ISO 15 radial bearing sized 630 x 850 x 165 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 630 mm |
| Outer diameter D | 850 mm |
| Width B | 165 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 4100 kN |
| Basic static load rating C0 | 9250 kN |
| Fatigue load limit Pu | 545 kN |
| Limiting speed (mechanical) | 320 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 277000 g |
| Manufacturer designation | NTN 239/630 |
| 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 | 24.803 in |
|---|---|
| Outer diameter D | 33.465 in |
| Width B | 6.496 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 110 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) | 24 of 38 |
| Bore above smallest 23900-series size | 470 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-630K | 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 239-630K (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 239-630 model number is decoded
The NTN order number 239/630 identifies a 630×850×165 mm (24.803 × 33.465 × 6.496 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 239/630 to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4100 kN C and 277000 g mass the 23900 series part is built for shock and vibration; the 165 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 277000 g (277.00 kg) for the 630×850×165 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 630 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
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
Selection pitfalls — read before you substitute
- At 630 mm bore 239/630 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 two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 320 r/min grease rating is lost to abrasive wear long before fatigue.
- The 4100/9250 kN ratings, 545 kN Pu and 277000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/630 (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 239/630?
239/630 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 850 mm OD and 165 mm width (24.803 × 33.465 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4100 kN, C0 9250 kN, Pu 545 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 277000 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?
239/630 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/630K (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. 239/630 is the basic execution.
What do D1 and W33 mean on 239/630?
239/630 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 239/630 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 — 4100 kN C / 9250 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.