The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-259-3546, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is H-K Connecticut Holding Company. Government technical data includes 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-259-3546 |
| Primary Part Number | R2359P4 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | H-K Connecticut Holding Company |
| Status | ACTIVE |
| Width Across Flats | 0.050 INCHES NOMINAL IN |
| Head Height | 0.048 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN |
| Fastener Length | 0.173 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN |
| Thread Length | 0.137 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763 300 SERIES FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.086 INCHES IN |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 56 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.154 INCHES MINIMUM AND 0.164 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 |
|---|---|
| R2359P4 PRIMARY | H-K Connecticut Holding Company (USA) |
| R2359P4 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| R2359P4 | 5/9 Secondary reference Allen Mfg Co Sub of Chicago Pneumatic Tool Co |
| R2359P4 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Parker-Kalon Fastener Div |
| R2359P4 | 7/2 Vendor item drawing reference Lockheed Martin Corp Div Space |
| R2359P4 | 5/9 Secondary reference Lockheed Martin Corporation Dba Lockheed Martin Aerostructures |
NSN 5305-01-259-3546 is a Screw,cap,socket Head, manufactured by H-K Connecticut Holding Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-259-3546 has 2 manufacturer part numbers on file: R2359P4 (H-K Connecticut Holding Company), R2359P4 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for R2359P4: Width Across Flats: 0.050 INCHES NOMINAL IN; Head Height: 0.048 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN; Fastener Length: 0.173 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN; Thread Length: 0.137 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN. 14 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.