The MKSP4AFS428 is an aircraft bearing with bore 6.35mm, outer diameter 19.05mm, and width 7.137mm.
Original catalog dimensions: 0.25 × 0.75 × 0.281 in. Metric values are converted using 25.4 mm/in.

| Load ratings basis | Reference values from the standard airframe-control bearing catalog for this size series: static radial and axial limit loads above; dynamic radial rating 900 lbf with the inner ring rotating and 770 lbf with the outer ring rotating, based on 10,000 complete 90° oscillation cycles. Ratings for your order are confirmed against drawing and application. |
| Bearing type | Aircraft Bearings |
| Series | Double-Row Precision Bearings |
| Seal type | Double Sealed |
| Material | Confirmed per inquiry — grade and certificate availability reviewed before quotation |
| Bore type | Round |
| Original catalog dimensions | 0.25 × 0.75 × 0.281 in |
| Dimension unit | millimeter (mm) display; original catalog dimensions in inch |
| Bore diameter (d) | 6.35 |
| Outer diameter (D) | 19.05 |
| Width (B) | 7.137 |
Corner radius, shoulder dimensions, fits and tolerances are confirmed against the requested suffix and application drawing before quotation.

The PDF drawing is free to download. DXF and 3D STEP files are sent on request: tell us the model and your application, and we reply with the CAD files.
Lubrication method and application speed limit are confirmed per inquiry; no oil-speed value is derived from this number.
The models below share the 6.35x19.05x7.137 mm boundary dimensions. Matching d/D/B alone does not prove interchangeability; verify seals, clearance, ring features, load ratings, fits, and application conditions before replacement.
| Model | Relationship | Series | Seal | Action |
|---|---|---|---|---|
| KP4A | Same boundary dimensions — verify fit/load | Double-Row Standard Bearings | Open | Quote → |
| KP4AFS428 | Same boundary dimensions — verify fit/load | Radials | Double Sealed | Quote → |
| KP4AFS464 | Same boundary dimensions — verify fit/load | Radials | Double Sealed | Quote → |
| KSP4AFS428 | Same boundary dimensions — verify fit/load | Roller Bearings | Double Sealed | Quote → |
| KSP4AFS464 | Same boundary dimensions — verify fit/load | Roller Bearings | Double Sealed | Quote → |
| MKP4AFS428 | Same boundary dimensions — verify fit/load | Double-Row Precision Bearings | Double Sealed | Quote → |
| MKP4AFS464 | Same boundary dimensions — verify fit/load | Double-Row Precision Bearings | Double Sealed | Quote → |
| MKSP4AFS464 | Same boundary dimensions — verify fit/load | Double-Row Precision Bearings | Double Sealed | Quote → |
Same bearing family or similar dimensions.
Similar size — reference only, verify all interfacesNLHB supports both in-house manufacturing and qualified partner sourcing. We confirm the specification, supply route, inspection requirements, and available documentation before quotation.
About NLHB →Send us your quantity, application and target lead time. We confirm spec, interchange and realistic delivery — no order confirmed until you approve.
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