23264EMD1 bearing: complete specifications & equivalents
The 23264EMD1 is a ISO 15 radial bearing sized 320 x 580 x 208 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 580 mm |
| Width B | 208 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 5230 kN |
| Basic static load rating C0 | 7370 kN |
| Fatigue load limit Pu | 259 kN |
| Limiting speed (mechanical) | 640 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 245000 g |
| Manufacturer designation | NTN 23264EMD1 |
| 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 & 23200-series range
| Bore d | 12.598 in |
|---|---|
| Outer diameter D | 22.835 in |
| Width B | 8.189 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 130 mm |
| Smallest bore in 23200-series | 90 mm |
| Largest outer diameter in 23200-series | 1360 mm |
| Width range across 23200-series | 52.4–475 mm |
| Bore position in 23200-series (smallest first) | 18 of 34 |
| Bore above smallest 23200-series size | 230 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23264EMKD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23264EMKD1 (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 23264EMD1 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 23264EMD1 denotes the 320 mm bore spherical roller bearing (5230 kN C / 7370 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 320 mm bore; the 208 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 5230 kN, C0 7370 kN (C0/C ≈ 1.41), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 640 r/min grease limiting speed is the cage/kinematic ceiling and 820 r/min is the oil-lubricated value for the 320 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23264EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.
Typical equipment & failure modes
Common applications
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
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
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- rolling-contact fatigue after the catalogue L10 life at the actual load
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- At 320 mm bore 23264EMD1 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 D1 23264EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- 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 320 mm bearing, and drive-up procedures differ.
- Do not confuse EA and EM at the same number: 23264EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.
- The 5230/7370 kN ratings, 259 kN Pu and 245000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23264EMD1 (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 23264EMD1?
23264EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 208 mm width (12.598 × 22.835 × 8.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5230 kN, C0 7370 kN, Pu 259 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 245000 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?
23264EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23264EMKD1 (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. 23264EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 23264EMD1?
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. 23264EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 23264EMD1 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5230 kN C / 7370 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.