The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-690-4185, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-690-4185 |
| Primary Part Number | 845-7526223-4-78 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.188 INCHES NOMINAL IN |
| Head Height | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Fastener Length | 1.000 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS2700,METHOD 1,TYPE 6 OR 7,CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.625 INCHES MINIMUM IN |
| Material Document and Classification | AMS5731 OR AMS5737 COLD WORKED AND AGE HARDENED TO MEET THE FASTENER REQUIREMENTS OF FF-S-86 AND NAS1351 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1351 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Locking Feature | PATCH LOCKING FEATURE |
| Surface Treatment | PASSIVATE OVERALL |
| Chamfer Angle | 30.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNRF |
| Head Diameter | 0.365 INCHES MINIMUM AND 0.375 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 |
|---|---|
| 845-7526223-4-78 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| NAS1351N4LB16 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-690-4185 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-690-4185 has 1 manufacturer part number on file: 845-7526223-4-78 (Naval Sea Systems Command).
Key specifications for 845-7526223-4-78: Width Across Flats: 0.188 INCHES NOMINAL IN; Head Height: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN; Fastener Length: 1.000 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS2700,METHOD 1,TYPE 6 OR 7,CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 19 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.