511-500 bearing: complete specifications & equivalents
The 511-500 is a ISO 104 radial bearing sized 500 x 600 x 80 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 500 mm |
| Outer diameter D | 600 mm |
| Width B | 80 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 575 kN |
| Basic static load rating C0 | 3400 kN |
| Fatigue load limit Pu | 65.5 kN |
| Limiting speed (mechanical) | 370 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 45000 g |
| Manufacturer designation | NTN 511/500 |
| Standard | ISO 104 |
| 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 & 51100-series range
| Bore d | 19.685 in |
|---|---|
| Outer diameter D | 23.622 in |
| Width B | 3.15 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 51100-series | 10 mm |
| Largest outer diameter in 51100-series | 640 mm |
| Width range across 51100-series | 9–85 mm |
| Bore position in 51100-series (smallest first) | 45 of 46 |
| Bore above smallest 51100-series size | 490 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 511 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 511-500 model number is decoded
NTN 511/500 belongs to the light-section 51100 thrust family of single-direction thrust ball bearings: 500 / 600 / 80 mm (shaft bore / OD / height). The designation is 511 is the dimension series (light-section 51100 thrust family) plus the part after the slash is the bore itself — 500 mm — used because the size falls outside the bore-code plan. NTN prints 575 kN axial dynamic and 3400 kN axial static for this size and a 65.5 kN fatigue load limit Pu. Selection starts from the load direction: if thrust ever reverses, plan a second thrust bearing (or a double-direction execution) rather than relying on the unloaded raceway. On a vertical shaft, pack grease between the washers and plan a relubrication path — centrifugal effect drives grease outward and the track runs dry without it.
Typical equipment & failure modes
Common applications
- heavy press and mill screwdown thrust seats
- crane slew-ring auxiliary thrust positions
- large mixer and reactor vertical shafts
- bulk-handler stacker/reclaimer thrust pivots
Known failure patterns
- cage pocket wear and ball skid polish after long running below the minimum axial load, the balls sliding instead of rolling on the washers
- fretting between shaft washer and shaft when the seat is cut loose — the washer creeps, the centre line shifts and the balls start running off-track
- early fatigue from thrust reversal hammering the unloaded raceway, because the bearing has no contact surfaces for the opposite direction
- cage breakage after repeated shock reversal banged the ball set against the pocket bridges
- contamination pitting from particles settling on the horizontal housing washer — the classic failure of vertical-shaft grease-lubricated seats
Selection pitfalls — read before you substitute
- For a 500 mm bore thrust bearing, the seating surfaces and oil supply decide service life; at this size a field-improvised housing is the usual root cause behind "premature" failures.
- The 511 light section is the speed-friendly end of the thrust-ball plan — for the same 500 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Shock thrust above C0a 3400 kN leaves dents that later become fatigue origins — crane-hook and press applications need the static check, not just the life calculation.
- Grease in a horizontal-washer seat stays only if the housing is designed to hold it; open vertical arrangements need an oil bath or a grease-retaining cover.
- Do not reuse a thrust bearing to "absorb" shaft thermal growth — the bearing clamps axially, so growth must be handled on the radial-bearing side of the arrangement.
- The Ca 575/C0a 3400 kN ratings and 65.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 511/500; raceway geometry legitimately differs between manufacturers, so re-verify ratings and washer identification before substituting another make.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 511/500?
511/500 is a single-direction thrust ball bearing to ISO 104: 500 mm shaft-washer bore, 600 mm outside diameter, 80 mm stack height (19.685 x 23.622 x 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 575 kN, C0a 3400 kN and a 65.5 kN fatigue load limit Pu; the grease limiting speed is 370 r/min and the oil rating 540 r/min; mass about 45000 g.
How is the 511/500 designation structured?
511 is the dimension series (light-section 51100 thrust family); the part after the slash is the bore itself — 500 mm — used because the size falls outside the bore-code plan. The 600 mm OD and 80 mm height follow the ISO 104 boundary plan for that series.
Can 511/500 carry radial load or reversing thrust?
No. The raceways contact the balls at 90 deg to the shaft, so the rating is purely axial and single-direction. Radial load must be carried by a separate radial bearing, and reversing thrust needs a second thrust bearing or a double-direction execution.
Why does NTN specify a minimum axial load for 511/500?
At the 370 r/min class speed, centrifugal and gyroscopic effects make an under-loaded ball set skid and smear instead of roll. The catalogue minimum-load formula gives the axial preload — from the machine weight, springs or a dead-weight — that keeps the contact rolling.
What should be checked before substituting another make for 511/500?
The 500/600/80 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 575 kN / C0a 3400 kN, the speed figures and the shaft/housing washer identification against the donor catalogue.
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.