The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-673-5540, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-673-5540 |
| Primary Part Number | AES14U312C25WA6FQ1 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Width Across Flats | 0.3125 INCHES MINIMUM AND 0.3160 INCHES MAXIMUM IN |
| Fastener Length | 3.250 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC AND NICKEL OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| AES14U312C25WA6FQ1 | The American Society of Mechanical Engineers (USA) |
| Reference | Meaning |
|---|---|
| ASME B18.24 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
NSN 5305-01-673-5540 is a Screw,cap,socket Head, manufactured by The American Society of Mechanical Engineers, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-673-5540 has 1 manufacturer part number on file: AES14U312C25WA6FQ1 (The American Society of Mechanical Engineers).
Key specifications for AES14U312C25WA6FQ1: Width Across Flats: 0.3125 INCHES MINIMUM AND 0.3160 INCHES MAXIMUM IN; Fastener Length: 3.250 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Head Style: FLAT CHAMFER. 11 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.