The Screw,machine, cataloged under National Stock Number 5305-00-079-2556, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-00-079-2556 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.053 INCHES NOMINAL IN |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 0.407 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Screw Material Document and Classification | QQ-S-763 FED SPEC 1ST MATERIAL RESPONSE OR MIL-S-7720 MIL SPEC 2ND MATERIAL RESPONSE |
| Thread Length | 0.360 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.060 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Departure From Cited Designator | AS MODIFIED BY INTERNAL DRIVE STYLE |
| Nondefinitive Spec/std Data | 3 TYPE AND 1C STYLE |
| Screw Material | STEEL COMP 430 OR STEEL COMP 302 |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 80 |
| Thread Series Designator | UNF |
| Head Diameter | 0.099 INCHES MINIMUM AND 0.113 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 |
|---|---|
| AN520C0R7 | 4/1 Identification reference U.S. Government activity |
NSN 5305-00-079-2556 is a Screw,machine, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-00-079-2556: Head Height: 0.053 INCHES NOMINAL IN; Screw Surface Treatment: PASSIVATE; Fastener Length: 0.407 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Screw Material Document and Classification: QQ-S-763 FED SPEC 1ST MATERIAL RESPONSE OR MIL-S-7720 MIL SPEC 2ND MATERIAL RESPONSE. 16 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.