51132 bearing: complete specifications & equivalents
The 51132 is a ISO 104 radial bearing sized 160 x 200 x 31 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 160 mm |
| Outer diameter D | 200 mm |
| Width B | 31 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 112 kN |
| Basic static load rating C0 | 425 kN |
| Fatigue load limit Pu | 14.4 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2100 g |
| Manufacturer designation | NTN 51132 |
| 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 | 6.299 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.22 in |
| ISO bore code | 32 |
| Radial section height (D−d)/2 | 20 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) | 26 of 46 |
| Bore above smallest 51100-series size | 150 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 51132 model number is decoded
51132 is an NTN single-direction thrust ball bearing of the light-section 51100 thrust family: 160 mm bore, 200 mm outside diameter, 31 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 51132: 511 is the dimension series (light-section 51100 thrust family), with 32 encodes the 160 mm bore (bore code x 5). The static margin, C0a 425 kN against Ca 112 kN, is what carries slow oscillating or shock thrust without permanent raceway dents. Size selection ends with the minimum-load check: at the 1,200 r/min class speed, the balls need a defined axial preload to keep rolling instead of skidding. Preload or working clearance must guarantee the minimum axial load at the catalogue speed; a spring or dead-weight arrangement is the usual answer on high-speed vertical shafts.
Typical equipment & failure modes
Common applications
- large mixer and reactor vertical shafts
- bulk-handler stacker/reclaimer thrust pivots
- heavy rotary furnace and kiln thrust points
- vertical hydro and pump-turbine thrust supports
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
- early fatigue from thrust reversal hammering the unloaded raceway, because the bearing has no contact surfaces for the opposite direction
- washer face corrosion under long standstill in humid service, later printed into the raceway as evenly spaced pitting
- washer face corrosion under long standstill in humid service, later printed into the raceway as evenly spaced pitting
Selection pitfalls — read before you substitute
- For a 160 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 160 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Below the minimum axial load the balls skid; the catalogue Ca of 112 kN never saves a bearing that is running too lightly loaded at 1,200 r/min.
- Radial load is the silent killer here: a belt pull or gear force on the same shaft must land on a radial bearing, because 51132 has no radial capacity at all.
- Shock thrust above C0a 425 kN leaves dents that later become fatigue origins — crane-hook and press applications need the static check, not just the life calculation.
- The Ca 112/C0a 425 kN ratings and 14.4 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51132; 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 51132?
51132 is a single-direction thrust ball bearing to ISO 104: 160 mm shaft-washer bore, 200 mm outside diameter, 31 mm stack height (6.299 x 7.874 x 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 112 kN, C0a 425 kN and a 14.4 kN fatigue load limit Pu; the grease limiting speed is 1,200 r/min and the oil rating 1,700 r/min; mass about 2100 g.
How is the 51132 designation structured?
511 is the dimension series (light-section 51100 thrust family); 32 encodes the 160 mm bore (bore code x 5). The 200 mm OD and 31 mm height follow the ISO 104 boundary plan for that series.
Can 51132 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 51132?
At the 1,200 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 51132?
The 160/200/31 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 112 kN / C0a 425 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.