241-560BK30 bearing: complete specifications & equivalents
The 241-560BK30 is a ISO 15 radial bearing sized 560 x 920 x 355 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 560 mm |
| Outer diameter D | 920 mm |
| Width B | 355 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 11100 kN |
| Basic static load rating C0 | 20800 kN |
| Fatigue load limit Pu | 1030 kN |
| Limiting speed (mechanical) | 280 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 934000 g |
| Manufacturer designation | NTN 241/560BK30 |
| 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 & 24100-series range
| Bore d | 22.047 in |
|---|---|
| Outer diameter D | 36.22 in |
| Width B | 13.976 in |
| ISO bore code | 41 |
| Radial section height (D−d)/2 | 180 mm |
| Smallest bore in 24100-series | 100 mm |
| Largest outer diameter in 24100-series | 1150 mm |
| Width range across 24100-series | 65–438 mm |
| Bore position in 24100-series (smallest first) | 28 of 32 |
| Bore above smallest 24100-series size | 460 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 241-560B | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-560B — 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 241-560BK30 model number is decoded
241/560BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 560×920×355 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 560 mm (two-digit code ×5, with the 00–03 exception table), and 920 mm OD / 355 mm width follow the general plan. Pu 1030 kN is the catalogue fatigue load limit for 241/560BK30, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 19.8 kN of C per millimetre of the 560 mm bore, 241/560BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.
Typical equipment & failure modes
Common applications
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
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
- roller-end smearing during skidding starts under light load and high viscosity grease
- hard-particle indentation through the open arrangement in dusty mining duty
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
Selection pitfalls — read before you substitute
- At 560 mm bore 241/560BK30 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.
- Never substitute 241/560BK30 by envelope alone: the 20800 kN C0 and 1030 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- Minimum load must be maintained even at rest under vibration: an unloaded 241/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Oil relubrication toward 370 r/min needs drain and level design; flooding the 355 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/560BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 11100/20800 kN ratings, 1030 kN Pu and 934000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/560BK30 (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 241/560BK30?
241/560BK30 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 355 mm width (22.047 × 36.22 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11100 kN, C0 20800 kN, Pu 1030 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 934000 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 24100 series). 241/560BK30 mounts on a matching adapter or withdrawal sleeve on a plain 560 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/560B.
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. 241/560BK30 is the basic execution.
What do D1 and W33 mean on 241/560BK30?
241/560BK30 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 241/560BK30 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11100 kN C / 20800 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.