The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-028-1518, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bae Systems Land & Armaments L.p.. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-028-1518 |
| Primary Part Number | 317207-C-206 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bae Systems Land & Armaments L.p. |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Width Across Flats | 0.375 INCHES NOMINAL IN |
| Head Height | 0.430 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.107 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.437 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PATCH THREADS |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 170000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 14 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.642 INCHES MINIMUM AND 0.656 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 |
|---|---|
| 3176207-C-206 | Naval Sea Systems Command (USA) |
| 317207-C-206 PRIMARY | Bae Systems Land & Armaments L.p. (USA) |
| Reference | Meaning |
|---|---|
| 5305PL1243276 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 3176207-C-206 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 5305-01-028-1518 is a Screw,cap,socket Head, manufactured by Bae Systems Land & Armaments L.p., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-028-1518 has 2 manufacturer part numbers on file: 3176207-C-206 (Naval Sea Systems Command), 317207-C-206 (Bae Systems Land & Armaments L.p.).
Key specifications for 317207-C-206: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 63.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Width Across Flats: 0.375 INCHES NOMINAL IN. 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.