240-710BK30 bearing: complete specifications & equivalents
The 240-710BK30 is a ISO 15 radial bearing sized 710 x 1030 x 315 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 710 mm |
| Outer diameter D | 1030 mm |
| Width B | 315 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 10300 kN |
| Basic static load rating C0 | 22500 kN |
| Fatigue load limit Pu | 1150 kN |
| Limiting speed (mechanical) | 230 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 870000 g |
| Manufacturer designation | NTN 240/710BK30 |
| 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 & 24000-series range
| Bore d | 27.953 in |
|---|---|
| Outer diameter D | 40.551 in |
| Width B | 12.402 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 160 mm |
| Smallest bore in 24000-series | 65 mm |
| Largest outer diameter in 24000-series | 1580 mm |
| Width range across 24000-series | 35–462 mm |
| Bore position in 24000-series (smallest first) | 34 of 42 |
| Bore above smallest 24000-series size | 645 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 240-710B | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-710B — 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 240-710BK30 model number is decoded
NTN lists 240/710BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 710 mm bore, 1030 mm OD, 315 mm width, rated 230 r/min on grease. Numbering ties 240/710BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 10300 kN C and 870000 g mass the 24000 series part is built for shock and vibration; the 315 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 870000 g (870.00 kg) for the 710×1030×315 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 240/710BK30 on its adapter or withdrawal sleeve on the 710 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.
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
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- 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
- rolling-contact fatigue after the catalogue L10 life at the actual load
Selection pitfalls — read before you substitute
- At 710 mm bore 240/710BK30 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 240/710BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 1:30 tapered bore is the only difference from the cylindrical-bore 240/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.
- Oil relubrication toward 300 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.
- The 10300/22500 kN ratings, 1150 kN Pu and 870000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/710BK30 (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 240/710BK30?
240/710BK30 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 315 mm width (27.953 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10300 kN, C0 22500 kN, Pu 1150 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 870000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/710BK30 mounts on a matching adapter or withdrawal sleeve on a plain 710 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/710B.
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. 240/710BK30 is the basic execution.
What do D1 and W33 mean on 240/710BK30?
240/710BK30 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 240/710BK30 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10300 kN C / 22500 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.