51164 bearing: complete specifications & equivalents
The 51164 is a ISO 104 radial bearing sized 320 x 400 x 63 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 400 mm |
| Width B | 63 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 365 kN |
| Basic static load rating C0 | 1660 kN |
| Fatigue load limit Pu | 39.5 kN |
| Limiting speed (mechanical) | 550 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18400 g |
| Manufacturer designation | NTN 51164 |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 2.48 in |
| ISO bore code | 64 |
| 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) | 36 of 46 |
| Bore above smallest 51100-series size | 310 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 51164 model number is decoded
At 320 x 400 x 63 mm, NTN 51164 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 64 encodes the 320 mm bore (bore code x 5). The washer section here is 40.0 mm of radial height, and the catalogue couples it with Ca 365 kN / C0a 1660 kN. Within the thrust-ball plan, 511 is the light section and 514 the heaviest for a given bore; moving up a series raises the C0a from 1660 kN class figures at the cost of OD and height. Mount the stack in order and confirm the shaft washer sits against its shoulder before loading: pressing through the balls brinells the raceway on the spot.
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
- 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
- lubricant starvation scoring on the raceway track when grease is thrown outward by centrifugal effect and never replaced
- 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 320 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 320 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- The 550 r/min speed figure assumes the catalogue lubrication state; at high speed the limiting factor is often the minimum load, not the rating table.
- Radial load is the silent killer here: a belt pull or gear force on the same shaft must land on a radial bearing, because 51164 has no radial capacity at all.
- The C0a of 1660 kN is a static rating: sizing continuous working thrust from C0a alone overstates what the raceway survives.
- The Ca 365/C0a 1660 kN ratings and 39.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51164; 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 51164?
51164 is a single-direction thrust ball bearing to ISO 104: 320 mm shaft-washer bore, 400 mm outside diameter, 63 mm stack height (12.598 x 15.748 x 2.48 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 365 kN, C0a 1660 kN and a 39.5 kN fatigue load limit Pu; the grease limiting speed is 550 r/min and the oil rating 790 r/min; mass about 18400 g.
How is the 51164 designation structured?
511 is the dimension series (light-section 51100 thrust family); 64 encodes the 320 mm bore (bore code x 5). The 400 mm OD and 63 mm height follow the ISO 104 boundary plan for that series.
Can 51164 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 51164?
At the 550 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 51164?
The 320/400/63 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 365 kN / C0a 1660 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.