The Screw,close Tolerance, cataloged under National Stock Number 5305-01-322-1597, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-322-1597 |
| Primary Part Number | ST3M559-4-8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.106 INCHES NOMINAL IN |
| Fastener Length | 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-ST3-559-4-8 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | RECESSED TYPE I |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.497 INCHES MINIMUM AND 0.507 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 |
|---|---|
| ST3M559-4-8 PRIMARY | The Boeing Company Div Defense (USA) |
NSN 5305-01-322-1597 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-322-1597 has 1 manufacturer part number on file: ST3M559-4-8 (The Boeing Company Div Defense).
Key specifications for ST3M559-4-8: Head Height: 0.106 INCHES NOMINAL IN; Fastener Length: 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN; Thread Length: 0.397 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN. 17 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.