NKIB 5903 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with NKIB 5903. 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.
NKIB 5903 dimensions and recorded technical data
The recorded NKIB 5903 base designation measures 17×30×20 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from SKF. It does not assign the same dimensions or operating ratings to every suffix.
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 NKIB 5903
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 NKIB 5903 — 35 recorded parameters
Combined needle roller / angular contact ball bearing for axial loads in both directions
Reference: SKF product 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.
Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | Not separately recorded | 17.0 mm |
| Outside diameter | Not separately recorded | 30.0 mm |
| Width | Not separately recorded | 20.0 mm |
| Width, outer ring | Not separately recorded | 18.0 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Reference speed | Not separately recorded | 18000.0 r/min |
| Limiting speed | Not separately recorded | 20000.0 r/min |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Rolling bearing type | Not separately recorded | Needle roller / angular contact ball bearing |
| Bearing part | Not separately recorded | Complete bearing |
| 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 | Double-direction |
| Radial internal clearance | Not separately recorded | CN |
| Tolerance class | Not separately recorded | Not applicable |
| Material, bearing | Not separately recorded | Bearing steel |
| Coating | Not separately recorded | Without |
| Indicative carbon footprint for new product | Not separately recorded | 0.21 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.0558 kg |
Engineering — Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 17 mm |
| Outside diameter | D | 30 mm |
| Width | B | 20 mm |
| Width of outer ring | C | 18 mm |
| Diameter of inner ring raceway | F | 22 mm |
| Chamfer dimension | r 1 ,2 | min. 0.3 mm |
Engineering — Abutment dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter of shaft abutment | d a | min. 19 mm |
| Diameter of housing abutment | D a | max. 28 mm |
| Radius of fillet | r a | max. 0.3 mm |
Engineering — Calculation data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating, radial | C | 11.4 kN |
| Basic static load rating, radial | C 0 | 16.3 kN |
| Basic dynamic load rating, axial | C | 2.24 kN |
| Basic static load rating, axial | C 0 | 2.74 kN |
| Fatigue load limit, radial | P u | 1.96 kN |
| Fatigue load limit, axial | P u | 0.116 kN |
| Reference speed | Not separately recorded | 18000 r/min |
| Limiting speed | Not separately recorded | 20000 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) |
|---|---|---|---|---|---|---|
| SKFNKIB 5903Combined needle roller / angular contact ball bearing for axial loads in both directions |
| — | — | 18000 rpm | 20000 rpm | 0.0558 kg55.8 g |
| INANKIB5903-XLNeedle roller/angular contact ball bearing |
| 12.4 kN | 14.6 kN | 15000 rpm | 20600 rpm | 0.05558 kg55.58 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 NKIB 5903 | Not recorded | Not recorded | CN | Not recorded | Bearing steel | Not recorded |
| INA NKIB5903-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.