The Screw,machine, cataloged under National Stock Number 5305-00-809-3053, 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 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-809-3053 |
| Primary Part Number | 51B221-15H |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN |
| Screw Surface Treatment | CADMIUM AND CHROMATE |
| Fastener Length | 1.213 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN |
| Thread Length | 0.261 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN |
| Shank Surface Finish | 32.0 MICROINCHES |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL COMP 4340 OR STEEL COMP 8740 OR STEEL COMP 4140 OR STEEL COMP 6150 OR STEEL COMP 8735 |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORQUE SET |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNF |
| Head Diameter | 0.381 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES |
| 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 |
|---|---|
| 51B221-15H PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 51B221-15H | Hi-Shear Corporation (USA) |
| 51B221-15H | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 51B221-15H | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 51B221-15H | Monadnock Company, the Dba Lisi Aerospace (USA) |
| 51B221-15H | Howmet Global Fastening Systems Inc (USA) |
| 51B221-15H | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| 51B221-15H | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| 51B221-15H | 5/2 Secondary reference U.S. Government activity |
| 51B221-15H | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 51B221-15H | 5/2 Secondary reference U.S. Government activity |
NSN 5305-00-809-3053 is a Screw,machine, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-809-3053 has 7 manufacturer part numbers on file: 51B221-15H (Northrop Grumman Systems Corporation), 51B221-15H (Hi-Shear Corporation), 51B221-15H (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 51B221-15H (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 51B221-15H (Monadnock Company, the Dba Lisi Aerospace) and 2 more.
Key specifications for 51B221-15H: Head Height: 0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN; Screw Surface Treatment: CADMIUM AND CHROMATE; Fastener Length: 1.213 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN; Thread Length: 0.261 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN. 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.