The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-009-3970, 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 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-009-3970 |
| Primary Part Number | A51B25619-11 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Width Across Flats | 0.6257 INCHES MINIMUM AND 0.6295 INCHES MAXIMUM IN |
| Head Height | 0.875 INCHES NOMINAL IN |
| Fastener Length | 2.605 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-8837,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.412 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-8844,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | BEVEL-CONICAL |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 1.428 INCHES MINIMUM AND 1.438 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 |
|---|---|
| A51B25619-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| PLA51B25619 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51B25619-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51B25619-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5305-01-009-3970 is a Screw,cap,socket Head, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-009-3970 has 2 manufacturer part numbers on file: A51B25619-11 (Northrop Grumman Systems Corporation), PLA51B25619 (Northrop Grumman Systems Corporation).
Key specifications for A51B25619-11: Width Across Flats: 0.6257 INCHES MINIMUM AND 0.6295 INCHES MAXIMUM IN; Head Height: 0.875 INCHES NOMINAL IN; Fastener Length: 2.605 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-8837,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 16 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.