51130 bearing: complete specifications & equivalents
The 51130 is a ISO 104 radial bearing sized 150 x 190 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 | 150 mm |
| Outer diameter D | 190 mm |
| Width B | 31 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 109 kN |
| Basic static load rating C0 | 400 kN |
| Fatigue load limit Pu | 13.9 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2000 g |
| Manufacturer designation | NTN 51130 |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 1.22 in |
| ISO bore code | 30 |
| 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) | 25 of 46 |
| Bore above smallest 51100-series size | 140 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 51130 model number is decoded
51130 is the 150 mm member of NTN's light-section 51100 thrust family: 190 mm across the washers, 31 mm tall. Reading the code: 511 is the dimension series (light-section 51100 thrust family), and 30 encodes the 150 mm bore (bore code x 5). NTN prints 109 kN axial dynamic and 400 kN axial static for this size and a 13.9 kN fatigue load limit Pu. Against a thrust roller bearing of the same 150 mm bore, this bearing is cheaper, quieter and happier at speed, but carries far less load per mm of section. The shaft washer (bore 150 mm, tight on the shaft) and the housing washer (slightly looser bore) are not interchangeable — check the catalogue bore codes before pressing anything on.
Typical equipment & failure modes
Common applications
- vertical hydro and pump-turbine thrust supports
- large marine winch and windlass shafts
- heavy press and mill screwdown thrust seats
- crane slew-ring auxiliary thrust positions
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
- cage breakage after repeated shock reversal banged the ball set against the pocket bridges
- 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 150 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 150 mm bore it gives up load to gain OD, height and limiting-speed headroom.
- Shock thrust above C0a 400 kN leaves dents that later become fatigue origins — crane-hook and press applications need the static check, not just the life calculation.
- Never substitute a double-direction bearing drawing part-for-part: the single-direction 51130 stack height of 31 mm and washer set differ from the double-direction execution.
- 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 109/C0a 400 kN ratings and 13.9 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51130; 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 51130?
51130 is a single-direction thrust ball bearing to ISO 104: 150 mm shaft-washer bore, 190 mm outside diameter, 31 mm stack height (5.906 x 7.48 x 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 109 kN, C0a 400 kN and a 13.9 kN fatigue load limit Pu; the grease limiting speed is 1,200 r/min and the oil rating 1,800 r/min; mass about 2000 g.
How is the 51130 designation structured?
511 is the dimension series (light-section 51100 thrust family); 30 encodes the 150 mm bore (bore code x 5). The 190 mm OD and 31 mm height follow the ISO 104 boundary plan for that series.
Can 51130 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 51130?
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 51130?
The 150/190/31 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 109 kN / C0a 400 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.