24034EMD1 bearing: complete specifications & equivalents
The 24034EMD1 is a ISO 15 radial bearing sized 170 x 260 x 90 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 260 mm |
| Width B | 90 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 1100 kN |
| Basic static load rating C0 | 1600 kN |
| Fatigue load limit Pu | 66.3 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17200 g |
| Manufacturer designation | NTN 24034EMD1 |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 3.543 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 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) | 10 of 42 |
| Bore above smallest 24000-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24034EMK30D1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24034EMK30D1 (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 24034EMD1 model number is decoded
The NTN order number 24034EMD1 identifies a 170×260×90 mm (6.693 × 10.236 × 3.543 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 66.3 kN is the catalogue fatigue load limit for 24034EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 24034EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 24034EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 260 mm race.
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
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- hard-particle indentation through the open arrangement in dusty mining duty
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- At 170 mm bore 24034EMD1 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.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.
- Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 90 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 1,500 r/min grease rating is lost to abrasive wear long before fatigue.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24034EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 1100/1600 kN ratings, 66.3 kN Pu and 17200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24034EMD1 (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 24034EMD1?
24034EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 90 mm width (6.693 × 10.236 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1100 kN, C0 1600 kN, Pu 66.3 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17200 g. It is open, with one-piece machined brass cage (EM high-capacity design).
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
24034EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24034EMK30D1 (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. 24034EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24034EMD1?
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. 24034EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24034EMD1 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 — 1100 kN C / 1600 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.