The Screw,machine, cataloged under National Stock Number 5305-01-303-8221, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-303-8221 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Bearing Surface of Head Surface Finish | 32.0 MICROINCHES |
| Screw Surface Treatment | CADMIUM AND CHROMATE |
| Fastener Length | 0.344 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Screw Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Length | 0.225 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Locking Feature Material | PLASTIC POLYAMIDE NYLON |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Thread Surface Finish | 32.0 MICROINCHES |
| Specification/standard Data | 80205-NAS1189 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Locking Feature | PELLET |
| Screw Material | IRON ALLOY 660 |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORQUE SET |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNJC |
| Head Diameter | 0.231 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-416 TYPE 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| NAS1189-06T6N | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-303-8221 is a Screw,machine, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-303-8221: Bearing Surface of Head Surface Finish: 32.0 MICROINCHES; Screw Surface Treatment: CADMIUM AND CHROMATE; Fastener Length: 0.344 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Screw Material Document and Classification: AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE. 22 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.