The Screw,machine, cataloged under National Stock Number 5305-01-623-3945, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-623-3945 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN |
| Bearing Surface of Head Surface Finish | 63.0 MICROINCHES |
| Screw Surface Treatment | CADMIUM |
| Fastener Length | 0.7965 INCHES MINIMUM AND 0.8435 INCHES MAXIMUM IN |
| Screw Material Document and Classification | AMS6382 NATIONAL SPEC 1ST MATERIAL RESPONSE OR AMS6415 OR AMS6484 NATIONAL SPEC 2ND MATERIAL RESPONSE OR AMS6322 NATIONAL SPEC 3RD MATERIAL RESPONSE |
| Thread Length | 0.7965 INCHES MINIMUM AND 0.8435 INCHES MAXIMUM IN |
| Shank Surface Finish | 32.0 MICROINCHES |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Thread Surface Finish | 32.0 MICROINCHES |
| Specification/standard Data | 80205-NAS1801 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Width Between Flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Screw Material | STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8740 |
| Internal Drive Style | CROSS RECESS TYPE II |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Hole Quantity | 3 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Hole Configuration Style | HEXAGON FLATS |
| Hole Diameter | 0.046 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| NAS1801-4D13 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-623-3945 is a Screw,machine, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-623-3945: Head Height: 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN; Bearing Surface of Head Surface Finish: 63.0 MICROINCHES; Screw Surface Treatment: CADMIUM; Fastener Length: 0.7965 INCHES MINIMUM AND 0.8435 INCHES MAXIMUM IN. 22 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.