The Bearing,washer,thrust, cataloged under National Stock Number 3120-01-259-4121, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3120-01-259-4121 |
| Item Name | Bearing,washer,thrust |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES LARGEST OUTSIDE DIAMETER |
| Corner Shape | SQUARE ALL CORNERS |
| Overall Thickness | 0.1660 INCHES NOMINAL IN |
| Style Designator | ROUND |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 4.5150 INCHES NOMINAL IN |
| Surface Condition | GROUND |
| Cross-Sectional Shape Style | RECTANGULAR |
| Outside Diameter | 5.0000 INCHES NOMINAL IN |
| Material | STEEL COMP 1020 OVERALL |
| Center Hole Shape Style | ROUND |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 764-5-24 | 3/2 Design control — primary reference U.S. Government activity |
| 764-5 PIECE 24 | 5/2 Secondary reference U.S. Government activity |
NSN 3120-01-259-4121 is a Bearing,washer,thrust, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5315-01-518-2200. Verify interchangeability with system specifications before substitution.
Key specifications for 3120-01-259-4121: Surface Finish: 63.0 MICROINCHES LARGEST OUTSIDE DIAMETER; Corner Shape: SQUARE ALL CORNERS; Overall Thickness: 0.1660 INCHES NOMINAL IN; Style Designator: ROUND. 11 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.