The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-516-3843, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-516-3843 |
| Primary Part Number | 1819505 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Width Across Flats | 1.250 INCHES NOMINAL IN |
| Head Height | 1.730 INCHES NOMINAL IN |
| Fastener Length | 6.000 INCHES NOMINAL IN |
| Thread Length | 4.438 INCHES MINIMUM AND 4.620 INCHES MAXIMUM IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM FASTENER |
| Nominal Thread Diameter | 1.750 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PELLET THREADS |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 109000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 5 |
| Material | STEEL COMP E4340 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 2.625 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 | X |
| Part Number | Manufacturer |
|---|---|
| 1819505 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 1977620 REV M ITEM NO 29 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5305-01-516-3843 is a Screw,cap,socket Head, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-516-3843 has 1 manufacturer part number on file: 1819505 (Northrop Grumman Systems Corporation).
Key specifications for 1819505: Width Across Flats: 1.250 INCHES NOMINAL IN; Head Height: 1.730 INCHES NOMINAL IN; Fastener Length: 6.000 INCHES NOMINAL IN; Thread Length: 4.438 INCHES MINIMUM AND 4.620 INCHES MAXIMUM 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.