NSK 51160X dimensions and axial-load reference
Read the complete assembly size
NSK 51160X is a single-direction thrust ball bearing reference with flat seat. Its nominal assembly envelope is 300×380×62 mm: shaft bore d = 300 mm, overall diameter D = 380 mm and total height T = 62 mm. A loose washer or cage measurement is not the height of the complete assembly.
Axial direction and support arrangement
This separable construction uses a shaft washer, a ball-and-cage assembly and a housing washer. It supports axial force in one direction. This is a thrust-only construction. It cannot be chosen as the sole radial support for a shaft. Radial force and overturning loads need a separately verified support arrangement.
Axial ratings, not permissible working loads
The printed basic dynamic axial rating is Ca = 360 kN and the basic static axial rating is C0a = 1560 kN. These values belong to the catalogue assembly and standard cage. They are not radial Cr/C0r values and do not by themselves establish an allowable operating load or a guaranteed life.
Speed and lubrication
The catalogue lists 600 r/min for grease lubrication and 900 r/min for oil lubrication. These are lubrication-specific limiting speeds, not permission to run every installation continuously at that speed. The actual load, lubricant delivery, temperature and heat removal still need checking. A minimum axial load is required to avoid ball/washer slippage; this source table does not provide a model-specific minimum-load force.
Installation checks before selecting this model
Identify the shaft washer by the d bore and distinguish it from the housing washer with bore D1 = 304 mm. Keep the raceway faces towards the balls. Confirm the seating surfaces, shoulders, fillets, retention and separate radial support against the machine drawing. The mounting dimensions in the parameter table are geometric references, not a complete machine assembly procedure.
Meaning of X in this catalogue
Here X indicates that the shaft washer outside diameter d1 is smaller than the housing washer outside diameter D. It is a geometry qualification, not an ABEC precision grade. Retain X when matching the printed reference.
Selection and mounting limits
- No machine fitment or direct replacement approval follows from equal boundary dimensions. Compare the construction, load directions, ratings, speed, fits and full marking.
- No grease fill, temperature limit, installed preload, retaining-nut torque, numerical clearance or CAD file is established by these table rows. Missing information has not been borrowed from another model.
- The standard-cage ratings can change if the cage or number of balls changes. A different suffix requires its own specification.
Technical basis:NSK Rolling Bearings for Industrial Machinery, E1103d (2025), Part C, C304–C305; construction and identification C296–C297. Source checked 2026-10-01. BearingScope independently organises factual catalogue data for lookup and comparison; it does not sell bearings or approve machine modifications.
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Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Variant / construction | Axial deep groove ball bearing | |
| Bore diameter | d | 300 mm |
| Outside diameter | D | 380 mm |
| Width | B | 62 mm |
| Mass | ≈m | 17.2 kg |
Mounting dimensions3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum shaft abutment diameter | da min. | 348 mm |
| Maximum housing abutment diameter | Da max. | 332 mm |
| Maximum housing-side fillet radius | ra max. | 2 mm |
Assembly boundary dimensions3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Shaft-washer bore diameter | d | 300 mm |
| Overall outside diameter | D | 380 mm |
| Complete assembled height | T | 62 mm |
Axial load ratings2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Basic dynamic axial load rating | Ca | 360000 N |
| Basic static axial load rating | C0a | 1560000 N |
Chamfers1 parameter
| Parameter | Symbol | Value |
|---|---|---|
| Minimum housing-side chamfer | r min. | 2 mm |
Component dimensions2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Shaft washer outside diameter | d1 | 376 mm |
| Housing washer bore diameter | D1 | 304 mm |
Construction3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Axial load directions | One direction | |
| Seat construction | Flat seat | |
| Radial-load support | Not suitable for radial load; separate radial support required |
Lubrication-qualified speed2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Limiting speed — grease | 600 r/min | |
| Limiting speed — oil | 900 r/min |
Mass reference1 parameter
| Parameter | Symbol | Value |
|---|---|---|
| Approximate assembly mass | 17.2 kg |