The Washer,recessed, cataloged under National Stock Number 5310-01-166-6685, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-166-6685 |
| Primary Part Number | 25-64204-1 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-A-250/4 T3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.415 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Material Thickness | 0.063 INCHES NOMINAL IN |
| Recess Diameter | 0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Hole Diameter | 0.190 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN |
| Recess Angle | 100.0 DEGREES NOMINAL |
| 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 |
|---|---|
| 25-64204-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 25-64204-1 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| 25-64204-1 | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
NSN 5310-01-166-6685 is a Washer,recessed, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-166-6685 has 1 manufacturer part number on file: 25-64204-1 (Northrop Grumman Systems Corporation).
Key specifications for 25-64204-1: Style Designator: RECESSED; Material Document and Classification: QQ-A-250/4 T3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.415 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN; Material Thickness: 0.063 INCHES NOMINAL IN. 8 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.