24140EMK30D1 bearing: complete specifications & equivalents
The 24140EMK30D1 is a ISO 15 radial bearing sized 200 x 340 x 140 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 200 mm |
| Outer diameter D | 340 mm |
| Width B | 140 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 2130 kN |
| Basic static load rating C0 | 2930 kN |
| Fatigue load limit Pu | 105 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 50700 g |
| Manufacturer designation | NTN 24140EMK30D1 |
| 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 | 7.874 in |
|---|---|
| Outer diameter D | 13.386 in |
| Width B | 5.512 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 11 of 32 |
| Bore above smallest 24100-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24140EMD1 | 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 24140EMD1 — 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 24140EMK30D1 model number is decoded
NTN lists 24140EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 200 mm bore, 340 mm OD, 140 mm width, rated 1,100 r/min on grease. Reading the full code: the number gives the 200×340 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 24140EMK30D1: 1,100 r/min grease and 1,400 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.38 (2930/2130 kN) reflects the heavy static and shock proportioning of 24140EMK30D1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 200 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
- 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
- roller-end smearing during skidding starts under light load and high viscosity grease
- false brinelling on stopped machines exposed to screen or crusher vibration
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- At 200 mm bore 24140EMK30D1 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 140 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- 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 200 mm bearing, and drive-up procedures differ.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24140EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The 2130/2930 kN ratings, 105 kN Pu and 50700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24140EMK30D1 (EM machined-brass-cage/D1); 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 24140EMK30D1?
24140EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 140 mm width (7.874 × 13.386 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2930 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 50700 g. It is open, with one-piece machined brass cage (EM high-capacity design) 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). 24140EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 200 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24140EMD1.
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. 24140EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24140EMK30D1?
D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24140EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24140EMK30D1 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 — 2130 kN C / 2930 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.