The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-449-6993, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-449-6993 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.3750 INCHES MINIMUM AND 0.3790 INCHES MAXIMUM IN |
| Head Height | 0.450 INCHES MINIMUM IN |
| Fastener Length | 0.960 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416, TY 2, CL 2. EMBRITTLEMENT TEST DOES NOT APPLY ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.960 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Material Document and Classification | FF-S-86 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Locking Feature | STRIP LOCKING FEATURE |
| Nonstandard Thread Pitch Diameter | +0.4639 TO 0.4675 INCHES IN |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNRF |
| Head Diameter | 0.735 INCHES MINIMUM AND 0.750 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 |
| Reference | Meaning |
|---|---|
| NAS1351-8LL16P | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-449-6993 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-449-6993: Width Across Flats: 0.3750 INCHES MINIMUM AND 0.3790 INCHES MAXIMUM IN; Head Height: 0.450 INCHES MINIMUM IN; Fastener Length: 0.960 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416, TY 2, CL 2. EMBRITTLEMENT TEST DOES NOT APPLY ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 18 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.