The Bearing,ball,annular, cataloged under National Stock Number 3110-00-618-9494, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-00-618-9494 |
| Primary Part Number | 903580 |
| Item Name | Bearing,ball,annular |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Retainer Fabrication Method | MACHINED |
| Internal Fit-Up Designation | STANDARD |
| Surface Finish | GROUND |
| Style Designator | NON-LOADING GROOVE, NON-SEPARABLE |
| Overall Outside Diameter | 0.3750 INCHES NOMINAL IN |
| Bore Shape | STRAIGHT |
| Load Direction | RADIAL |
| Standard Tolerance Designation | ABEC NO.1 |
| Bore Diameter | 0.1250 INCHES NOMINAL IN |
| Material | STEEL OUTER RING |
| Material | STEEL INNER RING |
| Material | STEEL BALL |
| Material | ALUMINUM ALLOY RETAINER |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| R2 | Fag Bearings Corporation (USA) |
| 33K3 | Timken Co Div the Timken Company (USA) |
| 903580 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| R2K3 | Schaeffler Aerospace Usa Corp Div Schaeffler Aerospace Usa Corporation (USA) |
| Reference | Meaning |
|---|---|
| R2XR1A | 5/9 Secondary reference General Motors Corp Delco Moraine Ndh Div |
| R2 | 5/9 Secondary reference Skf Usa Inc. |
| R2XR1A | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
| 903580 | 5/9 Secondary reference U.S. Government activity |
| R2XR1A | 5/9 Secondary reference General Motors Corp |
NSN 3110-00-618-9494 is a Bearing,ball,annular, manufactured by Northrop Grumman Systems Corporation, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-00-618-9494 has 4 manufacturer part numbers on file: R2 (Fag Bearings Corporation), 33K3 (Timken Co Div the Timken Company), 903580 (Northrop Grumman Systems Corporation), R2K3 (Schaeffler Aerospace Usa Corp Div Schaeffler Aerospace Usa Corporation).
1 possible match (shared part number, not a government interchangeability claim): 4730-00-766-9051. Verify interchangeability with system specifications before substitution.
Key specifications for 903580: Retainer Fabrication Method: MACHINED; Internal Fit-Up Designation: STANDARD; Surface Finish: GROUND; Style Designator: NON-LOADING GROOVE, NON-SEPARABLE. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.