The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-421-2027, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-421-2027 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Thread Length | 1.096 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN |
| Hardness Rating | 45.0 ROCKWELL C MINIMUM FASTENER |
| Material Document and Classification | SAE J429 GR8 FED STD ALL MATERIAL RESPONSES FASTENER |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Locking Feature | PELLET OR STRIP OR PATCH THREADS |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 120000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Material | STEEL FASTENER |
| 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 |
| Reference | Meaning |
|---|---|
| Z467AH013 | 5/9 Secondary reference U.S. Government activity |
| H467AH001 ITEM NO. 12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-421-2027 is a Screw,cap,hexagon Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-421-2027: Head Height: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN; Fastener Length: 1.250 INCHES NOMINAL IN; Thread Length: 1.096 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN; Hardness Rating: 45.0 ROCKWELL C MINIMUM FASTENER. 18 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.