The Screw,shoulder, cataloged under National Stock Number 5305-01-643-5063, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Aerobase Group Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-643-5063 |
| Primary Part Number | AES20U625625BB3A81 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Aerobase Group Inc |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Head Height | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Fastener Length | 0.625 INCHES NOMINAL IN |
| Thread Length | 0.625 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 11 |
| Material | STEEL UNS K03104 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.853 INCHES MINIMUM AND 0.875 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 |
| Part Number | Manufacturer |
|---|---|
| AES20U625625BB3A81 | Aerobase Group Inc (USA) |
| Reference | Meaning |
|---|---|
| AES20U625625BB3A81 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-643-5063 is a Screw,shoulder, manufactured by Aerobase Group Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-643-5063 has 1 manufacturer part number on file: AES20U625625BB3A81 (Aerobase Group Inc).
Key specifications for AES20U625625BB3A81: Width Across Flats: 0.500 INCHES NOMINAL IN; Head Height: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Fastener Length: 0.625 INCHES NOMINAL IN; Thread Length: 0.625 INCHES NOMINAL IN. 14 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.