The Screw,assembled Washer, cataloged under National Stock Number 5305-01-320-8838, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-320-8838 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.338 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN |
| Fastener Length | 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Secondary Washer Relationship to Primary Washer | NOT IDENTICAL |
| Primary Washer Outside Diameter | 0.334 INCHES NOMINAL IN |
| Thread Length | 0.203 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-6721 MIL SPEC ALL MATERIAL RESPONSES OR MIL-S-5059 MIL SPEC ALL MATERIAL RESPONSES SECONDARY WASHER |
| Material Document and Classification | QQ-S-763 CL 4 FED SPEC ALL MATERIAL RESPONSES OR MIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE FASTENER |
| Secondary Washer Style | FLAT |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | PAN NO. 2 |
| Primary Washer Style | SPLIT HELICAL RING |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.029 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Specification/standard Data | 80205-NAS1301 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Secondary Washer Outside Diameter | 0.338 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 2A A |
| Secondary Washer Material Thickness | 0.029 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 302 OR STEEL COMP 301 OR STEEL COMP 304 OR STEEL COMP 316 PRIMARY WASHER |
| Material | STEEL COMP 304 OR STEEL COMP 302 FASTENER |
| Material | STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 SECONDARY WASHER |
| Thread Series Designator | UNF |
| Washer Quantity | 2 |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.373 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 |
| Reference | Meaning |
|---|---|
| NAS1301C10-6 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-320-8838 is a Screw,assembled Washer, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-320-8838: Head Height: 0.338 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN; Fastener Length: 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Secondary Washer Relationship to Primary Washer: NOT IDENTICAL; Primary Washer Outside Diameter: 0.334 INCHES NOMINAL IN. 25 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.