The Screw,machine, cataloged under National Stock Number 5305-00-820-0751, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-820-0751 |
| Primary Part Number | 51B222-2 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Head Height | 0.133 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Screw Surface Treatment | CADMIUM |
| Fastener Length | 0.441 INCHES NOMINAL IN |
| Thread Length | 0.316 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76823-51B222 MANUFACTURERS STANDARD |
| Screw Material | STEEL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORQUE SET |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Thread Series Designator | UNF |
| Head Diameter | 0.464 INCHES MINIMUM AND 0.488 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 |
|---|---|
| 51B222-2 | Howmet Global Fastening Systems Inc (USA) |
| 51B222-2 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| 51B222-2 | Huck International, Inc (USA) |
| 51B222-2 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 51B222-2 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 51B222-2 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 51B222-2 | 5/2 Secondary reference U.S. Government activity |
| 51B222-2 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
NSN 5305-00-820-0751 is a Screw,machine, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-820-0751 has 6 manufacturer part numbers on file: 51B222-2 (Howmet Global Fastening Systems Inc), 51B222-2 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), 51B222-2 (Huck International, Inc), 51B222-2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 51B222-2 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 1 more.
Key specifications for 51B222-2: Head Height: 0.133 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Screw Surface Treatment: CADMIUM; Fastener Length: 0.441 INCHES NOMINAL IN; Thread Length: 0.316 INCHES MINIMUM IN. 15 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.