The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-306-1990, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-306-1990 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.375 INCHES NOMINAL IN |
| Head Height | 0.500 INCHES NOMINAL IN |
| Fastener Length | 2.000 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-23422 MIL SPEC SINGLE TREATMENT RESPONSE THREADS |
| Thread Length | 0.620 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CHROMIUM THREADS |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Head Diameter | 0.750 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 1936F73PC33 | 5/1 Secondary reference U.S. Government activity |
| 2260F49PC1 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5305-01-306-1990 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-306-1990: Width Across Flats: 0.375 INCHES NOMINAL IN; Head Height: 0.500 INCHES NOMINAL IN; Fastener Length: 2.000 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-23422 MIL SPEC SINGLE TREATMENT RESPONSE THREADS. 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.