The Screw,close Tolerance, cataloged under National Stock Number 5305-01-045-2467, 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 19 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-045-2467 |
| Primary Part Number | 51B223-54 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.162 INCHES MINIMUM AND 0.183 INCHES MAXIMUM IN |
| Fastener Length | 3.735 INCHES MINIMUM AND 3.782 INCHES MAXIMUM IN |
| Thread Length | 0.345 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 86823-51B223 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 3.360 INCHES MINIMUM AND 3.390 INCHES MAXIMUM IN |
| Grip Diameter | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 8740 OR STEEL COMP E4340 OR STEEL COMP 4340 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.568 INCHES MINIMUM AND 0.593 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 |
|---|---|
| 51B223-54 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 51B223-54 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 51B223-54 | Hi-Shear Corporation (USA) |
| 51B223-54 | Howmet Global Fastening Systems Inc (USA) |
| 51B223-54 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 51B223-54 | 5/2 Secondary reference U.S. Government activity |
| 51B223-54 | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 51B223-54 | 5/2 Secondary reference U.S. Government activity |
| 51B223-54 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 5305-01-045-2467 is a Screw,close Tolerance, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-2467 has 5 manufacturer part numbers on file: 51B223-54 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 51B223-54 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 51B223-54 (Hi-Shear Corporation), 51B223-54 (Howmet Global Fastening Systems Inc), 51B223-54 (Northrop Grumman Systems Corporation).
Key specifications for 51B223-54: Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.162 INCHES MINIMUM AND 0.183 INCHES MAXIMUM IN; Fastener Length: 3.735 INCHES MINIMUM AND 3.782 INCHES MAXIMUM IN; Thread Length: 0.345 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN. 19 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.