51160 bearing: complete specifications & equivalents
The 51160 is a ISO 104 radial bearing sized 300 x 380 x 62 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 300 mm |
| Outer diameter D | 380 mm |
| Width B | 62 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 355 kN |
| Basic static load rating C0 | 1560 kN |
| Fatigue load limit Pu | 38 kN |
| Limiting speed (mechanical) | 580 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17200 g |
| Manufacturer designation | NTN 51160 |
| 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 | 11.811 in |
|---|---|
| Outer diameter D | 14.961 in |
| Width B | 2.441 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 40 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) | 35 of 46 |
| Bore above smallest 51100-series size | 290 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 51160 model number is decoded
51160 is an NTN single-direction thrust ball bearing of the light-section 51100 thrust family: 300 mm bore, 380 mm outside diameter, 62 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Two fields make up the code — 511 is the dimension series (light-section 51100 thrust family) and 60 encodes the 300 mm bore (bore code x 5). Flat-seat washers make the bearing tolerant of simple housings but demand square faces: the whole 355 kN rating assumes the load arrives truly axial. For a 300 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. The housing washer needs radial freedom in its seat so the bearing can centre itself; clamping it radially defeats the self-centring the loose fit is designed to give.
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
- 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
- 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
- cage breakage after repeated shock reversal banged the ball set against the pocket bridges
Selection pitfalls — read before you substitute
- For a 300 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 300 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Single-direction means exactly that: thrust on 51160 in the wrong direction separates the washers and drops the ball set — if reversal is possible even during coast-down, engineer against it.
- The 580 r/min speed figure assumes the catalogue lubrication state; at high speed the limiting factor is often the minimum load, not the rating table.
- Never substitute a double-direction bearing drawing part-for-part: the single-direction 51160 stack height of 62 mm and washer set differ from the double-direction execution.
- The Ca 355/C0a 1560 kN ratings and 38 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51160; 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 51160?
51160 is a single-direction thrust ball bearing to ISO 104: 300 mm shaft-washer bore, 380 mm outside diameter, 62 mm stack height (11.811 x 14.961 x 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 355 kN, C0a 1560 kN and a 38 kN fatigue load limit Pu; the grease limiting speed is 580 r/min and the oil rating 820 r/min; mass about 17200 g.
How is the 51160 designation structured?
511 is the dimension series (light-section 51100 thrust family); 60 encodes the 300 mm bore (bore code x 5). The 380 mm OD and 62 mm height follow the ISO 104 boundary plan for that series.
Can 51160 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 51160?
At the 580 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 51160?
The 300/380/62 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 355 kN / C0a 1560 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.