NK50/25 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with NK50/25. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page5 sections ⌄
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.
NK50/25 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 NK50/25
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.
KOYO NK50/25 — 11 recorded parameters
Needle roller bearing
Reference: JTEKT / Koyo catalogue; source snapshot 2026-09-02.
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.
Technical Data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Fw | Not separately recorded | 50 mm |
| D | Not separately recorded | 62 mm |
| C | Not separately recorded | 25 mm |
| R(Min.) | Not separately recorded | 0.3 mm |
| Basic Load Ratings : Cr | Not separately recorded | 40.7 kN |
| Basic Load Ratings : C0R | Not separately recorded | 79.3 kN |
| Fatigue Load Limit : Cu | Not separately recorded | 12.5 kN |
| Limiting Speeds(Grease Lub.) | Not separately recorded | 5500 min-1 |
| Limiting Speeds(Oil Lub.) | Not separately recorded | 8500 min-1 |
| (Refer.)Mass | Not separately recorded | 0.171? kg |
| Mass(Refer.) | Not separately recorded | 0.171? kg |
SKF NK 50/25 — 33 recorded parameters
Single row needle roller bearing with machined rings, with flanges, without inner ring
Reference: SKF product catalogue; source snapshot 2026-09-02.
This can be a unit or housing record. Bolt spacing, housing envelope, centre height and the insert identity need separate checks; do not interpret every outside dimension as bearing D.
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 of needle roller complement | Not separately recorded | 50.0 mm |
| Outside diameter | Not separately recorded | 62.0 mm |
| Width | Not separately recorded | 25.0 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating | Not separately recorded | 41.5 kN |
| Basic static load rating | Not separately recorded | 73.5 kN |
| Reference speed | Not separately recorded | 8000.0 r/min |
| Limiting speed | Not separately recorded | 9000.0 r/min |
| SKF performance class | Not separately recorded | SKF Explorer |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bearing part | Not separately recorded | Bearing without inner ring |
| Number of rows | Not separately recorded | 1 |
| Outer ring type | Not separately recorded | Machined (solid) |
| Aligning feature | Not separately recorded | Without |
| Cage | Not separately recorded | Sheet steel |
| Number of flanges, outer ring | Not separately recorded | 2 |
| Tolerance class | Not separately recorded | Normal |
| Material, bearing | Not separately recorded | Bearing steel |
| Coating | Not separately recorded | Without |
| Sealing | Not separately recorded | Without |
| Relubrication feature | Not separately recorded | With |
| Indicative carbon footprint for new product | Not separately recorded | 0.59 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.158 kg |
Engineering — Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter under rollers | F w | 50 mm |
| Outside diameter | D | 62 mm |
| Width | C | 25 mm |
| Chamfer dimension outer ring | r 1,2 | min. 0.6 mm |
Engineering — Abutment dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter of housing abutment | D a | max. 58 mm |
| Fillet radius | r a | max. 0.6 mm |
Engineering — Calculation data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| SKF performance class | Not separately recorded | SKF Explorer |
| Basic dynamic load rating | C | 41.5 kN |
| Basic static load rating | C 0 | 73.5 kN |
| Fatigue load limit | P u | 9.15 kN |
| Reference speed | Not separately recorded | 8000 r/min |
| Limiting speed | Not separately recorded | 9000 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) |
|---|---|---|---|---|---|---|
| SKFNK 50/25Single row needle roller bearing with machined rings, with flanges, without inner ring |
| 41.5 kN | 73.5 kN | 8000 rpm | 9000 rpm | 0.158 kg158 g |
| KOYONK50/25Needle roller bearing |
| 40.7 kN | 79.3 kN | — | 5500 rpmLimiting Speeds(Grease Lub.): 5500 min-1Limiting Speeds(Oil Lub.): 8500 min-1 | 0.171 kg171 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 NK 50/25 | Without | Not recorded | Not recorded | Sheet steel | Bearing steel | None |
| KOYO NK50/25 | 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.
NK50/25
Needle roller bearing
View full technical record →SKFNK 50/25
Single row needle roller bearing with machined rings, with flanges, without inner ring
View full technical record →INANK50/25-F-XL
Needle roller bearing
View full technical record →INANK50/25-F-XL-2S
Needle roller bearing
View full technical record →INANK50/25-TV-XL
Needle roller bearing
View full technical record →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.