The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-368-4690, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Air Specialties, Inc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-368-4690 |
| Primary Part Number | 53A-00-231-18 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Air Specialties, Inc |
| Status | ACTIVE |
| Head Height | 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Fastener Length | 3.594 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN |
| Thread Length | 3.402 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Locking Feature | STRIP THREADS |
| Minimum Tensile Strength | 130000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | NICKEL ALLOY K-500 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 |
|---|---|
| 53A-00-231-18 PRIMARY | Air Specialties, Inc (USA) |
| 53A-00-231-18 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 53A-00-231-18 | 5/9 Secondary reference Alpha Aerospace Hardware Inc |
| 53A-00-231-18 | 5/9 Secondary reference Illinois Tool Wks Inc Linac Div |
| MIL-DTL-1222 | 4/1 Identification reference U.S. Government activity |
| MIL-S-1222 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-368-4690 is a Screw,cap,hexagon Head, manufactured by Air Specialties, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-368-4690 has 2 manufacturer part numbers on file: 53A-00-231-18 (Air Specialties, Inc), 53A-00-231-18 (Naval Sea Systems Command).
Key specifications for 53A-00-231-18: Head Height: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN; Fastener Length: 3.594 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN; Thread Length: 3.402 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN; Material Document and Classification: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 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.