The Bearing,washer,thrust, cataloged under National Stock Number 3120-00-159-6981, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-00-159-6981 |
| Primary Part Number | 517579 |
| Item Name | Bearing,washer,thrust |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Flange Thickness | 0.1290 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN |
| Overall Thickness | 0.2400 INCHES MINIMUM AND 0.2600 INCHES MAXIMUM IN |
| Style Designator | ROUND |
| Diameter | 1.5625 INCHES MINIMUM AND 1.5630 INCHES MAXIMUM IN |
| Surface Condition | GROUND |
| Cross-Sectional Shape Style | SHOULDERED |
| Outside Diameter | 1.7500 INCHES NOMINAL IN |
| Shank Outside Diameter | 1.6600 INCHES MINIMUM AND 1.6605 INCHES MAXIMUM IN |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 517579 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| 517579 | 5/9 Secondary reference Litton Systems Inc. Div Navigation Systems Division |
NSN 3120-00-159-6981 is a Bearing,washer,thrust, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-00-159-6981 has 1 manufacturer part number on file: 517579 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
Key specifications for 517579: Flange Thickness: 0.1290 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN; Overall Thickness: 0.2400 INCHES MINIMUM AND 0.2600 INCHES MAXIMUM IN; Style Designator: ROUND; Diameter: 1.5625 INCHES MINIMUM AND 1.5630 INCHES MAXIMUM IN. 9 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.