511-530 bearing: complete specifications & equivalents
The 511-530 is a ISO 104 radial bearing sized 530 x 640 x 85 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 530 mm |
| Outer diameter D | 640 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 645 kN |
| Basic static load rating C0 | 4000 kN |
| Fatigue load limit Pu | 74.5 kN |
| Limiting speed (mechanical) | 350 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 55800 g |
| Manufacturer designation | NTN 511/530 |
| 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 | 20.866 in |
|---|---|
| Outer diameter D | 25.197 in |
| Width B | 3.346 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 55 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) | 46 of 46 |
| Bore above smallest 51100-series size | 520 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 511-530 model number is decoded
At 530 x 640 x 85 mm, NTN 511/530 sits in the light-section 51100 thrust family of the single-direction thrust programme. Reading the code: 511 is the dimension series (light-section 51100 thrust family), and the part after the slash is the bore itself — 530 mm — used because the size falls outside the bore-code plan. With Ca 645 kN and C0a 4000 kN, each mm of shaft bore carries about 1.22 kN of dynamic axial rating. Where misalignment between shaft and housing seats is expected, the spherical-seat washer executions (listed separately in the catalogue) absorb what the flat-seat 511/530 cannot. Keep the support faces square: a housing face out of perpendicular by a few hundredths over the 640 mm OD already tilts the raceway and concentrates the 4000 kN static capacity on a few balls.
Typical equipment & failure modes
Common applications
- bulk-handler stacker/reclaimer thrust pivots
- heavy rotary furnace and kiln thrust points
- vertical hydro and pump-turbine thrust supports
- large marine winch and windlass shafts
Known failure patterns
- ball and raceway smearing from gyroscopic spin when the bearing runs fast under too little axial load — the minimum-load rule exists exactly for this
- housing-washer rocking on an out-of-square support face, seen as uneven wear around the raceway circle and rising running torque
- rapid flaking after radial load was allowed onto the bearing — a single-direction thrust ball bearing carries axial load only
- washer face corrosion under long standstill in humid service, later printed into the raceway as evenly spaced pitting
- edge loading from a shaft washer mounted off-centre, cutting the contact ellipse short at one side of the track
Selection pitfalls — read before you substitute
- For a 530 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 530 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Single-direction means exactly that: thrust on 511/530 in the wrong direction separates the washers and drops the ball set — if reversal is possible even during coast-down, engineer against it.
- Radial load is the silent killer here: a belt pull or gear force on the same shaft must land on a radial bearing, because 511/530 has no radial capacity at all.
- 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.
- The Ca 645/C0a 4000 kN ratings and 74.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 511/530; 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 511/530?
511/530 is a single-direction thrust ball bearing to ISO 104: 530 mm shaft-washer bore, 640 mm outside diameter, 85 mm stack height (20.866 x 25.197 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 645 kN, C0a 4000 kN and a 74.5 kN fatigue load limit Pu; the grease limiting speed is 350 r/min and the oil rating 500 r/min; mass about 55800 g.
How is the 511/530 designation structured?
511 is the dimension series (light-section 51100 thrust family); the part after the slash is the bore itself — 530 mm — used because the size falls outside the bore-code plan. The 640 mm OD and 85 mm height follow the ISO 104 boundary plan for that series.
Can 511/530 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 511/530?
At the 350 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 511/530?
The 530/640/85 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 645 kN / C0a 4000 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.