The Washer,recessed, cataloged under National Stock Number 5310-01-359-0253, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Raytheon Company. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-359-0253 |
| Primary Part Number | 40A11998-2 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Raytheon Company |
| Status | ACTIVE |
| Material Document and Classification | QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material Thickness | 0.187 INCHES NOMINAL IN |
| Recess Diameter | 0.376 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN |
| Material | STEEL COMP 321 OVERALL |
| Hole Diameter | 0.316 INCHES MINIMUM AND 0.321 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 |
|---|---|
| 40A11998-2 PRIMARY | Raytheon Company (USA) |
| Reference | Meaning |
|---|---|
| 40A11998-2 | 5/9 Secondary reference Hughes Missile Systems Co San Diego |
NSN 5310-01-359-0253 is a Washer,recessed, manufactured by Raytheon Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-359-0253 has 1 manufacturer part number on file: 40A11998-2 (Raytheon Company).
Key specifications for 40A11998-2: Material Document and Classification: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material Thickness: 0.187 INCHES NOMINAL IN; Recess Diameter: 0.376 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN; Special Features: RECTANGULAR STYLE,0.700 IN. WIDTH; 1.000 IN. LENGTH IN. 6 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.