The Screw,machine, cataloged under National Stock Number 5305-01-478-0891, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-478-0891 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Extended Washer Thickness | 0.023 INCHES NOMINAL IN |
| Head Height | 0.087 INCHES NOMINAL IN |
| Fastener Length | 0.438 INCHES NOMINAL IN |
| Screw Material Document and Classification | AMS 6300 NATIONAL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM B221 NATIONAL SPEC 2ND MATERIAL RESPONSE OR ASTM B241 NATIONAL SPEC 2ND MATERIAL RESPONSE OR ASTM B308 NATIONAL SPEC 2ND MATERIAL RESPONSE |
| Extended Washer Diameter | 0.375 INCHES NOMINAL IN |
| Thread Length | 0.346 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | ROUND EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL OR ALUMINUM ALLOY |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.312 INCHES NOMINAL 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 |
|---|---|
| AN525D832R7 | 3/2 Design control — primary reference U.S. Government activity |
| AN525D832R7 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-478-0891 is a Screw,machine, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-478-0891: Extended Washer Thickness: 0.023 INCHES NOMINAL IN; Head Height: 0.087 INCHES NOMINAL IN; Fastener Length: 0.438 INCHES NOMINAL IN; Screw Material Document and Classification: AMS 6300 NATIONAL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM B221 NATIONAL SPEC 2ND MATERIAL RESPONSE OR ASTM B241 NATIONAL SPEC 2ND MATERIAL RESPONSE OR ASTM B308 NATIONAL SPEC 2ND MATERIAL RESPONSE. 15 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.