21319K bearing: complete specifications & equivalents
The 21319K is a ISO 15 radial bearing sized 95 x 200 x 45 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 95 mm |
| Outer diameter D | 200 mm |
| Width B | 45 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 375 kN |
| Basic static load rating C0 | 420 kN |
| Fatigue load limit Pu | 54 kN |
| Limiting speed (mechanical) | 2100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7000 g |
| Manufacturer designation | NTN 21319K |
| 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 & 21300-series range
| Bore d | 3.74 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.772 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 52.5 mm |
| Smallest bore in 21300-series | 40 mm |
| Largest outer diameter in 21300-series | 240 mm |
| Width range across 21300-series | 23–50 mm |
| Bore position in 21300-series (smallest first) | 12 of 14 |
| Bore above smallest 21300-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 21319-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21319-NTN — 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 21319K model number is decoded
21319K belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 45 mm width follow the general plan. Pu 54 kN is the catalogue fatigue load limit for 21319K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 52.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. Never mount 21319K 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 200 mm race.
Typical equipment & failure modes
Common applications
- large vibrating screens and mining feeders
- heavy conveyor and bucket-excavator pulleys
- jaw/cone crusher eccentric and shaft positions
- paper-machine dryer and press 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
- brinelling from static overload or a hammer blow during sleeve mounting
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 7000 g cocking damages the spherical raceways, and repositioning after seating is impractical.
- Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.
- Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.
- 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 95 mm bearing, and drive-up procedures differ.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21319K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 375/420 kN ratings, 54 kN Pu and 7000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21319K (C design-code); 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 21319K?
21319K is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 420 kN, Pu 54 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 7000 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K denotes a 1:12 tapered bore. 21319K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21319.
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. 21319K is the C design-code execution.
What do D1 and W33 mean on 21319K?
21319K 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 21319K take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 375 kN C / 420 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.