51196 bearing: complete specifications & equivalents
The 51196 is a ISO 104 radial bearing sized 480 x 580 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 | 480 mm |
| Outer diameter D | 580 mm |
| Width B | 80 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 525 kN |
| Basic static load rating C0 | 3100 kN |
| Fatigue load limit Pu | 60.5 kN |
| Limiting speed (mechanical) | 380 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 43300 g |
| Manufacturer designation | NTN 51196 |
| 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 | 18.898 in |
|---|---|
| Outer diameter D | 22.835 in |
| Width B | 3.15 in |
| ISO bore code | 96 |
| 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) | 44 of 46 |
| Bore above smallest 51100-series size | 470 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 51196 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 51196 appears as a light-section 51100 thrust family bearing with a 480 mm shaft washer, a 580 mm housing diameter and 80 mm of stack height. NTN builds the number from 511 is the dimension series (light-section 51100 thrust family); 96 encodes the 480 mm bore (bore code x 5). NTN prints 525 kN axial dynamic and 3100 kN axial static for this size and a 60.5 kN fatigue load limit Pu. For a 480 mm shaft with combined radial-plus-axial load, pair this bearing with a separate radial bearing — the thrust ball bearing must never be asked to carry the radial share. After assembly, rotate under light load and check torque and temperature rise — a thrust ball bearing mounted with the washers swapped runs, but fails fast.
Typical equipment & failure modes
Common applications
- crane slew-ring auxiliary thrust positions
- large mixer and reactor vertical shafts
- bulk-handler stacker/reclaimer thrust pivots
- heavy rotary furnace and kiln thrust points
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
- 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
- edge loading from a shaft washer mounted off-centre, cutting the contact ellipse short at one side of the track
- lubricant starvation scoring on the raceway track when grease is thrown outward by centrifugal effect and never replaced
Selection pitfalls — read before you substitute
- For a 480 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 480 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Swapping the shaft and housing washers is an easy assembly error on the 480 mm size — the bores differ only slightly, but the wrong pairing walks off-centre under load.
- Single-direction means exactly that: thrust on 51196 in the wrong direction separates the washers and drops the ball set — if reversal is possible even during coast-down, engineer against it.
- 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 525/C0a 3100 kN ratings and 60.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51196; 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 51196?
51196 is a single-direction thrust ball bearing to ISO 104: 480 mm shaft-washer bore, 580 mm outside diameter, 80 mm stack height (18.898 x 22.835 x 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 525 kN, C0a 3100 kN and a 60.5 kN fatigue load limit Pu; the grease limiting speed is 380 r/min and the oil rating 550 r/min; mass about 43300 g.
How is the 51196 designation structured?
511 is the dimension series (light-section 51100 thrust family); 96 encodes the 480 mm bore (bore code x 5). The 580 mm OD and 80 mm height follow the ISO 104 boundary plan for that series.
Can 51196 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 51196?
At the 380 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 51196?
The 480/580/80 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 525 kN / C0a 3100 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.