51316 bearing: complete specifications & equivalents
The 51316 is a ISO 104 radial bearing sized 80 x 140 x 44 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 80 mm |
| Outer diameter D | 140 mm |
| Width B | 44 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Basic dynamic load rating C | 176 kN |
| Basic static load rating C0 | 425 kN |
| Fatigue load limit Pu | 18.2 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2720 g |
| Manufacturer designation | NTN 51316 |
| 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 & 51300-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.732 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 30 mm |
| Smallest bore in 51300-series | 25 mm |
| Largest outer diameter in 51300-series | 340 mm |
| Width range across 51300-series | 18–110 mm |
| Bore position in 51300-series (smallest first) | 12 of 25 |
| Bore above smallest 51300-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 51316-SKF | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 80×140×44 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 51316 model number is decoded
NTN 51316 belongs to the heavy-section 51300 thrust family of single-direction thrust ball bearings: 80 / 140 / 44 mm (shaft bore / OD / height). Reading the code: 513 is the dimension series (heavy-section 51300 thrust family), and 16 encodes the 80 mm bore (bore code x 5). At 44 mm of height the stack is compact for the 80 mm bore class, trading section height for the heavy-section load level. For a 80 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. 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
- vertical water-pump and turbine thrust blocks
- large crane hook and swivel assemblies
- rolling-mill screwdown and adjustment screws
- heavy press and forging-machine thrust seats
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
- washer face corrosion under long standstill in humid service, later printed into the raceway as evenly spaced pitting
- 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
- At 80 mm bore the washers are heavy enough to sag out of square during assembly — support the stack horizontally where possible and verify face runout before loading.
- The 513 heavy section buys capacity with a larger 140 mm OD and taller stack — check the housing space before upgrading a 512 position to this series.
- Swapping the shaft and housing washers is an easy assembly error on the 80 mm size — the bores differ only slightly, but the wrong pairing walks off-centre under load.
- Never substitute a double-direction bearing drawing part-for-part: the single-direction 51316 stack height of 44 mm and washer set differ from the double-direction execution.
- Below the minimum axial load the balls skid; the catalogue Ca of 176 kN never saves a bearing that is running too lightly loaded at 1,200 r/min.
- The Ca 176/C0a 425 kN ratings and 18.2 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 51316; 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 51316?
51316 is a single-direction thrust ball bearing to ISO 104: 80 mm shaft-washer bore, 140 mm outside diameter, 44 mm stack height (3.15 x 5.512 x 1.732 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 176 kN, C0a 425 kN and a 18.2 kN fatigue load limit Pu; the grease limiting speed is 1,200 r/min and the oil rating 1,800 r/min; mass about 2720 g.
How is the 51316 designation structured?
513 is the dimension series (heavy-section 51300 thrust family); 16 encodes the 80 mm bore (bore code x 5). The 140 mm OD and 44 mm height follow the ISO 104 boundary plan for that series.
Can 51316 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 51316?
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 51316?
The 80/140/44 mm envelope is ISO 104 interchangeable, but washer bore codes, raceway osculation and ratings are maker-specific. Re-verify Ca 176 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.