The Washer,recessed, cataloged under National Stock Number 5310-00-128-8161, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-128-8161 |
| Primary Part Number | A02D2509-4 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Top Recess Diameter | 1.285 INCHES MINIMUM AND 1.305 INCHES MAXIMUM IN |
| Bottom Recess Diameter | 1.285 INCHES MINIMUM AND 1.305 INCHES MAXIMUM IN |
| Top Recess Angle | 90.0 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Outside Diameter | 1.865 INCHES MINIMUM AND 1.885 INCHES MAXIMUM IN |
| Material Thickness | 0.205 INCHES NOMINAL IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Hole Diameter | 1.135 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN |
| 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 |
|---|---|
| A02D2509-4 PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| A02D2509-4 | 5/9 Secondary reference Creative Precision, Inc. |
NSN 5310-00-128-8161 is a Washer,recessed, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-128-8161 has 1 manufacturer part number on file: A02D2509-4 (The Boeing Company).
Key specifications for A02D2509-4: Top Recess Diameter: 1.285 INCHES MINIMUM AND 1.305 INCHES MAXIMUM IN; Bottom Recess Diameter: 1.285 INCHES MINIMUM AND 1.305 INCHES MAXIMUM IN; Top Recess Angle: 90.0 DEGREES NOMINAL; Style Designator: RECESSED BOTH SIDES. 10 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.