The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-288-9357, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-288-9357 |
| Primary Part Number | 6643070-23 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| Status | ACTIVE |
| Width Across Flats | 0.375 INCHES NOMINAL IN |
| Head Height | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Fastener Length | 3.260 INCHES NOMINAL IN |
| Thread Length | 1.500 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL COMP 4037 OR STEEL COMP 4140 OR STEEL COMP 4140H OR STEEL COMP 4142 OR STEEL COMP 4142H OR STEEL COMP 4145 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.750 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 |
|---|---|
| 6643070 PC23 | Argo Turboserve Corporation Div Argo Turboserve Corp. (USA) |
| 6643070-23 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| 6643070 PC23 | 3/9 Design control — primary reference Timken Gears & Services Inc. Div Philadelphia Gear |
| 6643070 PC23 | 5/9 Secondary reference General Electric Company |
| 781E557 PC65 | 5/9 Secondary reference General Electric Company |
NSN 5305-01-288-9357 is a Screw,cap,socket Head, manufactured by Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-288-9357 has 2 manufacturer part numbers on file: 6643070 PC23 (Argo Turboserve Corporation Div Argo Turboserve Corp.), 6643070-23 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for 6643070-23: Width Across Flats: 0.375 INCHES NOMINAL IN; Head Height: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN; Fastener Length: 3.260 INCHES NOMINAL IN; Thread Length: 1.500 INCHES MINIMUM IN. 13 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.