NKX 25 Z bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with NKX 25 Z. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
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Find by measured dimensions
Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.
NKX 25 Z dimensions and recorded technical data
Use the named dimensions for each complete record below. A generic d×D×B answer is not asserted where the base record is missing, dimension symbols are unverified, or the product uses a different geometry such as a housing or thrust assembly. Suffix records are not substituted for a missing base specification.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 2 recorded variants are listed. A dash means the value is missing, not zero.
Catalogue parameters for NKX 25 Z
Choose the complete brand and marking before reading a value. These source-labelled records add dimensions, construction and engineering properties where they were recorded; a shared model number does not establish interchangeability.
Units, ranges and minimum/maximum qualifiers are retained. The data is a dated catalogue reference, not a certified drawing, a complete current specification or an operating approval.
SKF NKX 25 Z — 41 recorded parameters
Combined needle roller / thrust ball bearing with a cover
Reference: SKF product catalogue; source snapshot 2026-09-02.
SKF NKX 25 Z has an under-roller diameter Fw of 25 mm, needle-bearing body outside diameter D of 37 mm, and width C of 30 mm. The stamped-steel thrust cover is larger: D2 = 43.2 mm. Allow for the cover instead of treating D as the maximum radial envelope.
The separately listed associated inner ring has a bore of 20 mm, raceway diameter 25 mm and width 20 mm. Fw is not that ring bore; an associated part listing does not establish that the part is included in the bearing assembly.
Calculated inch reference (Fw × D × C × cover D2): 0.984252 × 1.456693 × 1.181102 × 1.700787 in. This converts the recorded millimetres using exactly 25.4 mm/in and rounds to six decimals; it does not change the nominal series or supply machining tolerances.
Read radial and axial load ratings separately for the two bearing functions. Similar outer dimensions do not establish an interchangeable thrust arrangement or shaft-raceway requirement.
Under-roller diameter Fw, shaft raceway dimensions and an inner-ring bore are not interchangeable labels. Check whether an inner ring is included in the exact construction.
Values shown are retained from the recorded source. Zero boundary dimensions and zero load ratings from incomplete legacy feeds are withheld rather than presented as usable specifications.
Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | Not separately recorded | 25.0 mm |
| Outside diameter | Not separately recorded | 37.0 mm |
| Width | Not separately recorded | 30.0 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Reference speed | Not separately recorded | 6300.0 r/min |
| Limiting speed | Not separately recorded | 5500.0 r/min |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Rolling bearing type | Not separately recorded | Needle roller / thrust ball bearing |
| Bearing part | Not separately recorded | Radial part without inner ring |
| Thrust part | Not separately recorded | With cage |
| Radial part | Not separately recorded | With cage |
| Rolling element (thrust part) | Not separately recorded | Balls |
| Axial load capability | Not separately recorded | Single-direction |
| Tolerance class | Not separately recorded | Other |
| Material, bearing | Not separately recorded | Bearing steel |
| Coating | Not separately recorded | Without |
| Special feature | Not separately recorded | Thrust part with stamped steel cover without lubrication holes |
| Lubricant (thrust part) | Not separately recorded | Grease |
| Indicative carbon footprint for new product | Not separately recorded | 0.47 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.128 kg |
Engineering — Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter under rollers | F w | 25 mm |
| Outside diameter | D | 37 mm |
| Width | C | 30 mm |
| Width of thrust part | C 1 | 11 mm |
| Distance side face to lubrication hole | C 2 | 9.5 mm |
| Bore diameter of thrust part | d | 25 mm |
| Diameter of stamped steel cover | D 2 | 43.2 mm |
| Chamfer dimension | r 1,2 | min. 0.6 mm |
Engineering — Abutment dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter of shaft abutment | d a | min. 37.7 mm |
| Radius of fillet | r a | max. 0.6 mm |
| Radius of fillet | r b | max. 0.3 mm |
| Bore diameter of associated inner ring | d i | 20 mm |
| Diameter of inner ring raceway | F | 25 mm |
| Width of associated inner ring | B i | 20 mm |
Engineering — Calculation data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating, radial | C | 19 kN |
| Basic static load rating, radial | C 0 | 32.5 kN |
| Basic dynamic load rating, axial | C | 19.5 kN |
| Basic static load rating, axial | C 0 | 40.5 kN |
| Fatigue load limit, radial | P u | 4 kN |
| Fatigue load limit, axial | P u | 1.5 kN |
| Minimum axial load factor | A | 0.009 |
| Reference speed | Not separately recorded | 6300 r/min |
| Limiting speed | Not separately recorded | 5500 r/min |
No recorded variant matches these filters. Clear a filter to see other records; no substitute has been inferred.
| Brand / full designation | Named dimensions (mm / in) | Dynamic C (kN) | Static C0 (kN) | Reference speed (rpm) | Limiting speed (rpm) | Mass (kg / g) |
|---|---|---|---|---|---|---|
| SKFNKX 25 ZCombined needle roller / thrust ball bearing with a cover |
| — | — | 6300 rpm | 5500 rpm | 0.128 kg128 g |
| INANKX25-Z-XLNeedle roller/axial ball bearing |
| 21.3 kN | 30.5 kN | — | 6000 rpm | 0.12913 kg129.13 g |
Compare recorded seals, clearance, precision and materials
Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.
| Brand / designation | Closure | Original precision | Clearance | Cage | Material | Lubricant |
|---|---|---|---|---|---|---|
| SKF NKX 25 Z | Not recorded | Not recorded | Not recorded | Not recorded | Bearing steel | Not recorded |
| INA NKX25-Z-XL | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
How to compare these values
- Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
- Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
- C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
- Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
- A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.
Related prefix matches — other model numbers may appear
These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.
Check the drawing before substituting
Nominal dimensions are not shaft-fit tolerances. Different variants can add grooves, flanges, wider rings or assembly components. When the table has different dimensions, the complete designation—not the shared prefix—controls.
Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.